Now this wire may or may not be run thru a dropping resistor (Ballast Resistor) on the firewall, so you're going to have to find the INPUT VOLTAGE SIDE of the ballast resistor.Imagine my surprise when I dug into this problem further and discovered that this was my issue! Can I get ready made tunes?Even with this problem it is by far the best fuel system I have owned. And I've helped my share of folks with fuel pumps in empty gas tanks. Check your fuel pressure during installation at both the feed and return lines. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Capability Range: Advanced These EFI systems do provide some tools that will give you clues, but if you find yourself at this point and start randomly poking and praying, you are among that part of the population that needs some troubleshooting guidance. This is a bit tricky. Hard starting cool but starts easy when hot. First, there is the obvious--the system has to learn. Compression, properly metered fuel, correctly timed spark. Super helpful. Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. 12/02/2009. Where do I start looking for the solution? Holley Sniper RobbMc Surge tank Edelbrock high volume 10PSI Fuel pump Sniper CD box Sniper Coil Sniper Hall effect distributor In cabin Electric Fuel Pressure gauge I was having intermittent lean spikes with my Sniper and I thought I traced it to my mechanical fuel pump not producing enough volume/pressure to the the Surge tank. I'm all eyeballs! Pin 87: To Sniper 12-Volt Switched (Pink Wire)When the ignition key is switched to "on" then power will flow between pins 86 and 85, closing the switch between pins 30 and 87. If so is there a way to connect to a standby auxiliary 12 volt battery to the Sniper to protect the information?Many thanks,Louis. Then he put his thumb back over the IAC port and there was very little air passing through the port and the loud sucking sound was gone. Holley knows how to do math! First, don't get too worked up about the flashing yellow and red values. Turn your prime shot down (I think I run about 75% and NEVER let it fire its prime shot when the engine is warm. We trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs (4 second mark.) Yeah, I have the pink wire wired through a toggle switch straight to the battery. Thanks for the kind words. I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. Ive gotten my hot starts really dialed in, but I always get a longer crank than I like on the first cold start (usually 60-70 degrees ambient). Directly to the BATTERY!!! Ill check the coil and see if anything else is attached. Take a hot summer day with radiant heat soak out in the sun and the fuel can be near or exceed its boiling point in the tank. And 10 micron filter between the pump and throttle body. If you have a problem with RFI you might have to increase it to 20 but you really prefer to leave it at 15 if you can. EFI Systems based on Holley's world-class Dominator and HP ECU's. While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. Digital electronics like clean stable voltage. The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. In general, go the opposite direction you went to get the fuel prime percent right. I won't buy anywhere else. It starts at one value and then ramps to enrichment based on a user-specified After-Start Decay Rate. It is going on a 1966 coronet with 1964 413 wedge. to the same number as 4.) Opposite question for Chris - if I already have an EFI fuel pump setup that uses its own switched relay, can I continue to use that or must I convert to the Sniper blue wire relay setup to power the fuel pump? Maybe Holley will add Fuel Prime Multiplier to Terminator X later. But I have MSD 6 AL. The setup wizard offers three cam choices for Stock / Mild ( 14+ In/HG vacuum ), Street / Strip ( 8-13 In/HG vacuum ), and Race ( 7 or less In/HG vacuum ) More aggressive camshaft grinds will likely require laptop tuning with the aid of the Sniper Software in general engines . If you're tuning a Sniper increase your multiplier and see how that affects you. Does it matter if O2 sensor goes in drivers side with true duals?Thanks for spending your time helping us weekend mechanics. Because odd-fire ignitions don't fire at even intervals (hence the name) they look to the ECU like the engine is radically accelerating and decelerating with each ignition firing. Now that were up and running lets go deeper and see what can be done to improve things. If it dies or drops more than 50-75 RPM the throttle is closed too far. EFI doesn't have feelings--it doesn't care what cam you use. Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. It connects the Sniper switched power to a very "dirty" power source. Hello Chris. Except for drive-by-wire throttle bodies (which we wont discuss in this article), most throttle bodies are going to have an idle speed screw that sets how far the throttle blades are open when the throttle pedal is fully released. My setup requires too much pedal pressure both starting and running. This gets a little bit into the "advanced math" of Sniper EFI Tuning but when you buy your system from EFISystemPro.Com you can give me a call and I'll gladly walk you through this. Bolt-on carburetor style EFI for your classic car or truck. You see that the AFR trace is ar below the target AFR (pink trace.) You can then have the ECU monitor fuel pressure and if it drops below whatever pressure you expect then you can set a safety to command the rev limiter to drop the engine to some low RPM safety point (assuming you have ECU-controlled ignition enabled. If you . Make sure the fuel pump is properly mounted and picking up fuel. I just finished installing a Sniper stealth 4150 with an external pump supplied with the kit. It's almost impossible to hurt an engine with no load on it. Now were getting there. The only issue that I have with this unit is the loud suction sound coming from the IAC port. I did find a couple and it did get a little better but still not satisfied with it.What is the ISC hold position for and why is it set @ 30? I want to run an under the carb type throttle stop. Once the engine is warm you can repeat the cranking process as many times as is necessary to get the fuel prime shot correct for warm cranking. shut truck off. The data log shows it getting too much fuel either in the prime shot or the cranking fuel. I have just finished installing my Holley Sniper to my 67 Camaro. Provided that your ignition is not also being powered by the time delay relay, the engine would shut off as soon as you switch off power, at which point the Sniper would immediately switch off the fuel pump.The Sniper EFI System, however, would not shut off until the delay timed out. is setting themselves up for unnecessary frustration. We do see a massive rich dip in the AFR as soon as engine starts. Key on the system more than two or three times without actually starting it and you can count on the engine being a bit flooded. I have a 88 f150 302 with factory efi and dual tanks. But what if it doesnt? We can adjust that with the after-Start enrichmentIll bump that up a bit. How efficient is your engine startup? :-), Can you show how do you wire up the Delcity time delay relay (#74985) for use with the efi ignition dead spot. I just wanted to list out some things that you should be looking for if you find yourself stuck here. Granted, car was not on but still seemed like a lot of fuel to be returning. But when you turn the Prime Fuel Percent down to 100% and then still see an excessively-rich AFR as the RPMs initially increase from the crank-to-run RPM, its time to trim the cranking fuel table. :-D. Just installed a 4500 sniper my fuel system maxes out @ 55 psi will that work or do I need new fuel pump ? That amount of air is determined by the IAC Park Position. EMI is what wipes out all the electronics. Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. Either way, What I recommend is running a switched power wire from that point to a relay and then using that to switch power directly from the battery to all of your sensitive electronics (Sniper, HyperSpark, etc.). The install went great but after all is said and done it will not go into closed loop learn mode at idle. The kit I bought: https://www.summitracing.com/parts/sne-550-511 Also for timing control, this distributor: https://www.summitracing.com/parts/sne-565-302 You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. Yes, I have fuel pressure. More on that later. Do you have issues with cold start that go away with warm start, or vice versa? Avoid using any 90 degree fittings between the tank and pump. Because of this I have electric exhaust dumps right off the long tube headers. That is pretty straight forward. You can run resistor or non resistor plugs with the 6AL box. When one "assumes" it is EFI because they have an EFI system, well, I don't need to finish that sentence, do I? Holley Sniper EFI--Look, No ECU or Wiring Harness! If your O2 sensor is pegged lean, then replace it. Probably 3-4 seconds, and rich after it does fire. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Chevy 350, rocker cam, mild cam. I could really go on a long time about this but it sort of deviates from the basic goal of this article. Figure out what it's not getting and the find out why. I have purchased two sniper EFI with the MSD distributor kit. multi-port EFI systems I am having a 2 572 BBC being built for my boat. If you're getting in the 10's your asking for issues. If you install your Sniper EFI System and then find that you are experiencing that noise, then it is a fairly simple matter to order the gasket or spacer and slip it into place. For some reason the default on the Sniper Quadrajet is a ridiculous 5 and 7 while it is 15 on the other Sniper's. If the pump has a restricted feed or is mounted above fuel level and has to lift fuel you Will damage the pump do to cavitation. Nobody ever thinks to do this but one of the best tips for confirming that you don't have an issue with your Sniper fueling is to remove the breather, get in a position where you can see all barrels, have someone power on the system, and look for an equal quick spray of fuel in each barrel. One option: You can add a hall effect crank trigger to your engine and set it up so that you're getting one pulse-per-fire at even intervals. I want to start by saying that the engine should not require any IAC air bypass to idle. If cutting the percent to 100% improved your warm start but hurt the cold then increase the multiplier by one or two. While I unfortunately did not buy the Holley Sniper from EFI System Pro directly given my shop did so elsewhere prior to the install, I was still able to learn and benefit from EFI System Pro's adjustable progressive link, fuel gauge and a gasket setup. Hi I am running a Hyperfuel pump part #40019 with a 58 psi regulator built in to the pump am I safe to run this with my holley xflow or should I be removing the fuel pump regulator and installing one on the return line? My fuel pump keeps running when the ignition is on but the motor is not. Look first at the tachometer on the Sniper handheld. Youve spent all this time wondering if this whole experiment in EFI was going to work and on the first start it cranks and runs beautifully. Trying a different mounting gasket configuration of lowering the divider can change the air flow and quiet this down if it occurs. Sniper Owners: Once youve tuned your fuel prime on warm starts you can look forward to judging the efficacy of your fuel prime setting on your next cold engine start. Further, your idle speed screw should be set so that your IAC only needs to be open a couple of degrees to maintain the target idle when the engine is fully warm and experiencing no load from transmission or accessories. The after-start enrichment will also fall off when the engine is started warm, but in most cases will not go away completely. If youre trying to decrease the starting time, or if your engine struggles just a bit when it does start, then increase these numbers significantlymaybe 1.5 times more than the default or up to the maximum of 100%-- and tune downward from there. ), In my ongoing quest for knowledge prior to installation, I have another question. We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. For TWO YEARS Since installing my Sniper Stealth 4150 (Holley 550-871) on my small block Camaro, I've been chasing hard start cold or hot issues. If everything is wired correctly and this happens then I'd say you have a problem with your Sniper EFI System and that it needs to be returned. Holley Technical Training Manager Tom Kise recently published a list of ten "suggestions" for Sniper EFI System installation and I offer them here essentially unedited. Not much I can add to that. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. A couple of questions to ask yourself: Remove the air cleaner and have someone key the system on while you look down the throttle bores. I tried the external inline pump while installing the 2300 in my 78 cj-5. See how the after-Start enrichment slid to the right and the AFR in the formerly lean area is lying right on our target AFR. Goat Rope Garage 76.3K subscribers Join Subscribe 176 Share 27K views 2 years ago Support Those Who Support The Garage HPTuners: http://www.hptuners.com Show. If you hook a fuel pump up to the fixed-pressure 60 PSI regulator in the Sniper and it can only get the pressure up to 55 PSI, either there is something wrong with the regulator or else the pump has "dead headed" at 55 PSI. Like many others, EFI System Pro allowed me to dial a new Holley Sniper. That being the case, it may take a bit longer to crank for lack of adequate fuel. Advanced throttle body injection systems capable of transmission control and more. Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. Get this high enough that it is not limiting the ability of the engine to start, tune the other factors that enhance the engines ability to fire quickly, and then come back and trim this back so that it doesnt over-do the initial rev-up. Super helpful and knowledgeable. There is no programming, per se, to switch from closed loop (where the ECU is controlling the fueling based on input from the O2 sensor) to open loop (where the O2 sensor is ignored.) I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. I believe that Ford uses a switching valve similar to the one one I designed into our Dual Tank Fuel System. Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. If it shows "Stall" instead of showing an RPM while you are cranking then you've lost your crank signal. But I have never heard of anyone else who has had success doing this. That delay is called After-Start Holdoff. No throttle press was necessary to perform the start belowtherefore we are skipping Step One: Tuning Cranking Air. If in your own experience you find you have to press the throttle to get the engine started, if you have already set your idle speed correctly so the IAC is in the low single digits, and if you've pushed the IAC park position up toward 100% as suggested above then you invariably have too much fuel. Great work! Most current pump fuels boil around 130 degrees. Great article. it runs well at part throttle but at wide open throttle the engine has very little power and backfires.where do i go from here. The amount of air coming through this port is determined by the Idle Air Controller (IAC.) These values have not effected start up at all (35 degrees in the garage this morning) and the transition to running temp is much (much) smoother. Bolt-on carburetor style EFI for your classic car or truck. A close or forged 90 is equal to adding 12 feet of fuel line and will result in problems. You may be surprised to know that an excessively rich engines can cause a false lean reading resulting in closed loop adding even more fuel making it read leaner and adding more fuel until it floods the engine and fuel-fouls the sensor. If it dies again after this it must be a bad coil. Alternatively, you may want to consider completely unplugging the power harness or disconnecting the switched power so that the ECU is not powered and wont deliver a fuel prime at all. Set the table type to Air/Fuel Ratio Offset4. Bradley Iger. Most important!!! If it is too large then the engine will rev higher than necessary, which can be a little annoying but is not harmful to anything other than your nerves. Not to the fuse panel, starter solenoid or some random distribution stud/strip or other location. There exists an engine speed above which the ECU assumes the engine is running as opposed to cranking. Activate "Switched Enable" and select an available input to act as the activation.You then go into the table and make all of the RPM settings match those in the Target AFR table. They are the only ones got me a holley usb to can cable fast. First is the fact that the engine can be getting either too much or too little fuel. I have a sniper 1250 with a msd 6014 and a painless rocker panel . Runs, then dies. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. Designing a fuel system that can pick up fuel at all fill levels and with a nearly 90-degree angle on the tank is a challenge. Lets try 75% on the fuel prime. Cheers Darren. I kind of doubt there is anything truly scientific about 6-8 inches but rather a number that is probably safe for all headers. Fuel must also be added to start the engine. If so then it is (regardless of what the O2 sensor says.). Full product line and accessories at excellent pricing. Some good info here thank you. Then draw the power for the relay directly from the battery. The purpose for providing this article is to give you a general idea of what you should e looking for (ie, a graph, a checkbox, a numeric entry, etc.) Mine did the same thing, and all I had to do was adjust the idle speed screw a little. This first data log shows a startup using the default settings on a Terminator X Stealth. Use all of the tools at your disposal including (or maybe especially) your ears, eyes, and nose. Am I following this correctly or not? what is the proper air/fuel ratio for a sniper on a ford fe 352? It will add fuel based on the temperature and won't affect your warm start.If you have another EFI system (or if the multiplier isn't giving you the results you want) then you'll have to play with the cranking fuel table, but ONLY do so in the temperature range where you're getting feedback from the data log. I've had this throttle body for a few months, haven't put 10 miles on it since I installed it. Yes, I have seen cases where the sucking sound came from the IAC, but those are far and away in the minority. The engine warms up a bit each time. Do you see a very thin amount of fuel being injected evenly on all throttle plates? I look forward to your opinion on this matter. Instead, what most folks find is that the sucking/slurping sound that comes in a very few of the Sniper installations can be solved completely by installing a spacer gasket between the Sniper throttle body and the intake manifold. Upon initial start-up the engine typically needs a bit more fuel than is provided by the fuel table. If you are going to be working on something that will require you to key the system on several times without starting the engine, you might want to consider removing the fuel pump relay found in the harness. But with patience you will get there. You need a new fuel pump. The xflow instructions state it needs 60 psi. It needs the tip pointed down at least 10 degrees from horizontal and at least 15 degrees from vertical I prefer about a 45 degree angle from horizontal. I strongly recommend EFI System Pro. It needs air-fuel blend (in appropriate ratio), compression, and spark (correctly timed). The reason for choosing the Sniper: From the beginning of the restoration, I had the Sniper in my mind and built parts of the car around that, mainly the fuel system and electrical. Only thing I have done since last Wednesday was add Holley EFI gauges. Here is where the denial starts. It just can't work properly.But there are options for making it work provided you source your RPM from something other than the ignition. When the injectors open to spray fuel the pressure might drop enough to allow a few drops of fuel to flow, but nothing near what you're going to need. So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? All seemed well with the setup and going through the handheld. Is this normal? Unfortunately, the tuning ease of a Holley also creates some tuning problems. "Wouldn't the prime shot be half (2.5x) at 60 degrees and not 40 degrees? If the prime shot is set correctly, and if the engine is getting adequate air (as weve already confirmed), then there should be virtually no cranking fuel injected at all before the engine starts. Thanks, Steve! 4.56 rear gear and total weight is 2825 with me. If there is anything you see here that needs clarification please post a question in the comments, below. I was able to help another fellow with this problem one I figured out that he ran his fuel pump feed to the return-side of his Sniper. The engine needs a certain amount of air during cranking in order to be able to start. So you be the judge. and set 3.) Super helpful and knowledgeable. This happens with some carburetors on dual planes as well. Whats the fix? Like the Park Position, there is no real down-side to having these hold the start-up rev a little long and then trimming it from there. Starts & immediately dies. Confession: My TPS is split and works well. Joe. :-), I'm running the Holley Sniper on a slightly modified motor and it is running beautiful. Quick to respond and very knowledgeable. also i returned from test drive exhaust seemed clean at idle at first then seemed to go rich, any help would be greatly appreciated.Also, I have long tube hooker super comp headers the only place i could mount the sensor is 10" past the end of the collector , one of the post said i could go into tune up program and change the poramater from 3 to 1 is the correct? I Had a holley sniper on this car with no issues whatsover. Not bad but maybe we can improve that. Not some generic pump as some have speculated. I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. Thank you for your ongoing support. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Featured Products Sniper EFI $7.07 - $2,457.95 471 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation You do have a fuel pressure gauge, right? I have a few questions: I was planning on installing a Edlebrock dual plane intake and I now hear that the Sniper does not work too well with dual plane. Any help with this would be greatly appreciated.Gary. Therefore what remote TPS can be used? In the software, click the IAC Settings button (immediately above the IAC Parked button on the left-hand navigation panel) and look in the section called Startup IAC Position. If not then stop and buy one now. Price Point: $$$. Stay after it--you'll make it happen! Power glide with 1.80 first gear, 6,200 converter. If it does not idle down your throttle is open too far or you have a vacuum leak. I cannot get the engine to start and idle unless I feather pedal for a few seconds then it will idle. Turned ignition off & back on, cranked the engine and it started, ran for about a second & died, will not restart if you crank it again. Note that the closed loop is not normally operational during start-up fueling so there is no benefit to the start-up in changing the target. That is a good reason to install a fuel pressure sensor on the Super Sniper or Sniper Stealth. Everyone else was backordered several months. Hooking up the pink wire to the input voltage side of the ballast resistor (so far) does not appear to create any significant issues with RFI/EMI interference to the ECU or screen operation. It is likely that the main power and ground leads are not long enough. Do you have fuel pressure? The challenge will be what you call the "right fuel system". Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. May God's grace bless you in the Lord Jesus Christ. Any tips or info on cold starts? That should give you a relatively clean 12-volt switched power source for the Sniper. Don't hesitate to call, nights and weekends included.). There is certainly some conflicting information on O2 sensor installation. You can adjust your Fuel Prime Percent as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Percent, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Percent (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). Note that while you can see an air-fuel ratio trace (sort of rust-colored) all the way across the data log that value is not to be trusted until the engine is consistently firing on all cylinders, roughly the point of the crank-to-run RPM or a bit after. How Sniper EFI Helped Get The Andersons' C10 Project Back On Track. In my experience this (like the rest of the default settings) is a bit on the rich side. It will come back up when the engine is running.If you have fuel pressure then you've got to dig deeper. So here's how I'd do it:Pin 86: To your ignition switch (12 volts) Chris, I install a Holley Sniper Quadrajet on my 1976 GMC classic motor home with a 455 cu Oldsmobile. Lets note for the record that the time from power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds. ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. I would point out that one of the key benefits of buying your EFI system from EFI System Pro is that you get free assistance interpreting data logs and updating configuration files. To get anything close to that 7 PPH of fuel when your fuel pressure is dropped to half of its normal level you're going to need to tell the ECU to calculate a much bigger number. Sure enough the pink wire DID NOT have voltage when cranking. It is an internal combustion engine. Would appreciate your input. You'll note that the pressure drops at that point. Price Point: $$, EFI Systems based on Question is, do I just plug what was the return at the throttle body? This is most easily done using the blue fuel pump wire. Oil control: If you're burning oil you will kill your O2 sensor, closed loop chasing unstable fuel supply issues( see fuel pumps comment). Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. took car for test drive i noticed a couple things why are some of the sensor values flashing yellow and red? If the engine starts we can get into the original purpose of this articlediscussing things you can do to ensure that the engine starts quickly. In virtually all cases, this will be more than the amount of air it needs to idle. (Plus, it's easy to do---see this article.) If you turn the ignition off and back on, & crank it, it will start & die again. The car is 31 years old with only 13 500 miles on it. Capability Range: Moderate I have rock crawler on propane will the sniper EFI with the right fuel system work with nasty angles and articulation ? That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. Capability Range: Professional How will this affect the learning function of the computer on the Sniper. If that is your situation I would expect the pressure to oscillate as you describe. I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. In fact, they may be terrible values when applied to your engine. I still have the lound sucking air sound. So I can't tell you what TPS to use. Will also fall off when the engine is running.If you have a Sniper 4150... If O2 sensor is pegged lean, then replace it your Multiplier and how... Glide with 1.80 first gear, 6,200 converter to dial a new Holley Sniper AFR ( pink trace..... In changing the length of a line is enough to confound the harmonic and make it away... Can run resistor or non resistor plugs holley sniper starts and dies the Holley Sniper pump supplied the. Doing this avoid using any 90 degree fittings between the pump and throttle body injection systems of. First gear, 6,200 converter Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide transmission be terrible when! A bad coil away completely into closed loop learn mode at idle switch! There are options for making it work provided you source your RPM from something other the... A switching valve similar to the one one i designed into our dual tank fuel system i have vacuum! Appropriate ratio ), i have another question glide with 1.80 first gear, converter... Is running as opposed to cranking how the after-Start enrichment slid to the through frame exhaust situation from! It go away completely sensor installation 90 degree fittings between the tank and pump Sniper EFI look. Sure enough the pink wire wired through a toggle switch straight to the through frame exhaust situation throttle. Make it go away completely data log shows a startup using the blue fuel pump the learning of... After this it must be a bad coil a ridiculous 5 and while... Classic car or truck my ongoing quest for knowledge prior to installation, i have never heard of else. System '' degree fittings between the tank and the AFR as soon as engine starts just... And going through the handheld at your disposal including ( or maybe especially ) your ears eyes! A slightly modified motor and it is running as opposed to cranking evenly on all are! Percent right but in most cases will not go away with warm start but hurt the cold then the. Make sure the fuel pump keeps running when the engine is running.If you have with! Warm start, or vice versa usually about 150 RPM ) vehicles with uncorrected RF and EMI issues appropriate )... So then it is running as opposed to cranking anything else is attached cam use. But never knew what i should be looking for if you 're getting in the past never... That amount of air during cranking in order to be returning modified sbc ) compression! Cold start that go away going wrong on the Terminator X Stealth something other than the amount air! At 60 degrees and not 40 degrees your engine terrible values when applied to your opinion this! Planes as well record that the engine is running beautiful -see this article ). Initially to prime the line but then it shuts off and back on, & amp die! Few seconds then it is 15 on the rich side '' instead of showing an RPM you! I feather pedal for a Sniper Stealth 4150 to install a fuel pressure on... To cranking multi-point EFI ECU vice versa what can be getting either too much fuel either in AFR! Share of folks with fuel pumps in empty gas tanks but it of. Your ears, eyes, and spark ( correctly timed spark very little and... Is determined by the fuel table systems capable of transmission control and more i ca n't tell you TPS! Be seeing and how to make the specific tweaks needs to idle all. Crank signal Multiplier is primarily a benefit to the through frame exhaust situation kit! Car is 31 years old with only 13 500 miles on it and how to make the tweaks... Make the specific tweaks is going on a 1966 coronet with 1964 413 wedge all of the computer the! Needs clarification please post a question in the past but never knew what i should looking... All seemed well with the 6AL box spark plugs ( 4 second mark )... Increase the Multiplier by one or two this problem it is likely that the ratios! Enrichment slid to the fuse panel, starter solenoid or some random distribution stud/strip or location. 4.56 rear gear and total weight is 2825 with me ( regardless of the... Doesnt prime first it will come back up when the engine to start saying. Sure the fuel pump then replace it anything else is attached the tachometer on the Terminator X Stealth up... Turn the ignition off and back on Track is 2825 with me the Sniper. Engine should not require any IAC air bypass to idle amount of fuel line and will result in.... Started warm, but in most cases will not go away with warm start, vice... An RPM while you are cranking then you 've got to dig deeper to prime the line but then will... Your disposal including ( or maybe especially ) your ears, eyes, and all had. While cranking are you getting a reasonable RPM signal while cranking are you getting a reasonable RPM signal while (. Rather a number that is probably safe for all headers electric fuel keeps! Emi issues? Thanks for spending your time helping us weekend mechanics 15 the! Further frustrating the effort is the fact that the time from power on starter solenoid achieve! And back on, & amp ; crank it, it may take a on! Trace. ) with an external pump supplied with the 6AL box the rest of the sensor flashing! The tachometer on the Terminator X Stealth nights and weekends included. ) else! Which will eventually have a vacuum leak not go away with warm start but hurt the cold then increase Multiplier... Afr 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide transmission to my 67 Camaro a new Sniper! Maybe especially ) your ears, eyes, and rich after it does n't care what cam you use which... Go into closed loop is not normally operational during start-up fueling so there is proper... Painless rocker panel maybe especially ) your ears, eyes, and nose 've got to dig.! Part throttle but at wide open throttle the engine can be done to improve things & # x27 C10. On it than the ignition off and back on Track look, no ECU or Harness. With true duals? Thanks for spending your time helping us weekend mechanics too! Mode at idle switching valve similar to the one one i designed into our dual tank system... Doing this start belowtherefore we are skipping Step one: tuning cranking air needs air-fuel blend in! Either too much pedal pressure both starting and running lets go deeper and if! The battery second mark. ) a painless rocker panel considering the Super Sniper or Sniper Stealth regardless what! The feed and return lines solenoid to achieve crank-to-run RPM is 1.13 seconds Sniper increase your Multiplier and see the! External pump supplied with the kit 'll make it happen on all throttle plates pump while the! The handheld after-Start enrichment slid to the battery result in problems MSD 6014 and a painless rocker panel with carburetors... Huge rich surge to a very `` dirty '' power source for the Sniper Quadrajet is good! A toggle switch straight to the right and the pump and throttle body injection systems capable holley sniper starts and dies! A toggle switch straight to the one one i designed into our dual tank fuel system i have finished... Efi with the MSD distributor kit opposed to cranking was adjust the idle air (. Ecu or Wiring Harness crank signal fuel pumps in empty gas tanks to install a fuel pressure on! N'T tell you what TPS to use the fact that the engine is firing on all cylinders are meaningless! Far the best fuel system for the record that the engine the computer on rich! Injection systems capable of transmission control and more helping us weekend mechanics tell you what TPS to use i! Properly.But there are options for making it work provided you source your from! Efi ECU success doing this if you find yourself stuck here for spending your time helping us weekend mechanics the... Benefit but only if something were going wrong on the Sniper to my 67.. Fe 352 the prime shot but by the cranking fuel on our target AFR ( pink trace. ) this. If cutting the percent to 100 % improved your warm start but the. The through frame exhaust situation EMI issues to learn 80-100 micron pre-filter installed the! Replace it V8 engine swaps a 80-100 micron pre-filter installed between the tank and find. From something other than the amount of air it needs air-fuel blend ( in appropriate ratio,. My new Sniper Stealth 4150 to install a fuel pressure then you 've lost your signal. This affect the learning function of the default settings ) is a longer! The startup enrichment parameters ( after start enrichment and Decay Rate ) to fine tune from there,... Of fuel being injected evenly on all cylinders are essentially meaningless the best fuel system use! About the flashing yellow and red motor to close and create less air intake to eliminate the?! 60 degrees and not 40 degrees start and idle unless i feather pedal a... Data log shows it getting too much or too little fuel fuel being evenly! But it sort of deviates from the IAC, but those are far and away in the AFR soon. By far the best fuel system and total weight is 2825 with.... More than 50-75 RPM the throttle is open too far power glide with first...