If you trace that coil positive wire back you will find where it connects. Runs good, but dies while I drive down the road. Seems like thats what its doing. You are on the right track!Let me start by saying that I normally don't advise anyone to make changes to this until they have the system tuned as good as it can get and unless they have a bit of tuning experience. It worked fine with carb, hope someone can help. If, after setting the fuel prime percent above your warm start is perfect but your cold start is suffering you can tweak the multiplier up or down and see if that helps. Upon initial start-up the engine typically needs a bit more fuel than is provided by the fuel table. That's what the fuel prime is all about. Is there enough cable to get to the battery? How will this setup work? He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. Basically lean everything out by .5 and it should help a lot. I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. injection systems capable of "I've edited the article with a note about the difference. Latest Articles. The data log shows it getting too much fuel either in the prime shot or the cranking fuel. I really would like to replace the intake gaskets. That delay is called After-Start Holdoff. seems to be running rich at a idle. I have been looking at all efi units and I keep coming back to the Sniper. EFI sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives great. It was originally there more as a vent than a return and is inadequate in size to use as a return. Changed the fused location of the wire to the ignition, instead of the radio. This first data log shows a startup using the default settings on a Terminator X Stealth. Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. The IAC is essentially a computer controlled vacuum leak that allows additional air past the throttle plates to assist in idle stability and additional cold idle speed. This is the crank-to-run RPM. Avoid using any 90 degree fittings between the tank and pump. It does take some time looking at these data logs before they look like something more than the scribblings of a 2-year-old. So go forward with your install confident with the knowledge that if you need help, EFI System Pro can provide it. what is the proper air/fuel ratio for a sniper on a ford fe 352? If so, maybe this is why I'm having a lot of starting issues and running very rich no matter if it's warm or cold? First, it is fake news that EFI doesn't like big cams. Price Point: $$$. Bill Tichenor. Pinched or Burnt O2 sensor Wiring: Keep it high, tight, and safe. Yes, I have seen cases where the sucking sound came from the IAC, but those are far and away in the minority. If you do not understand a step seek assistance. Im getting ready to instal a sniper master kit on a Ford I'm lucky to get two warm up cycles a day and then it is a moving target - but I've made considerable progress. In my experience this (like the rest of the default settings) is a bit on the rich side. #1 I have a sniper 551-550, I dont understand how to took the brown wire (tach input). MSD recommends non resistor plugs. As I suggest above lets start with the fuel prime percent, taking it from 150% to 100% and see what that does. Third is the truth that every engine has its own preference on what it likes for startup fuel. Your assistance would be greatly appreciated. You can feather it a bit so that it generally keeps the same shape but don't impact the cranking fuel up in your warm temp region. Make sure you are using proper wiring practices. Being a throttle-body based injection system, it gets an adequate picture of the air/fuel mixture by seeing a blend of all of the exhaust ports on one side of the engine. It will come back up when the engine is running.If you have fuel pressure then you've got to dig deeper. 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. 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.) There is certainly some conflicting information on O2 sensor installation. This is most easily done using the blue fuel pump wire. If the fuel pressure is a little low don't worry about that. If it dies or drops more than 50-75 RPM the throttle is closed too far. Thanks for the kind words, Tony. Did you hear the fuel pump run at key-on? In a you tube video I watched , the presentaor indicated that the return fuel line could be routed to the filler neck ( of the tank ). There should be no relay added to this wire. Too little opening and the engine risks not having enough air to start. Get a gauge. Would love some feedback as what I need to do to help my issue. The Sniper EFI throttle-body drops in place of your carburetor. If you have RF and or EMI issues you need to correct them. That article is actually written by Holley's Tom Kise but I'll be glad to help on it. However, I went to turn my pick up on today and it wouldn't start, just turned over. 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. Tried the Holley forum but The manual states that this signal should not be split. The next time it picks up fuel and hits the proper pressure it goes pig rich washing the O2 sensor down with fuel, damaging the sensor and causing a dead lean reading that in turn floods the engine. 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. Would it start & quit like that if the switched wire wasnt working? The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. The Sniper ships with an OEM grade Bosch O2 sensor. It seams that I need to splice it to the wire coming from the distributor then splice another wire from the 10pin to the tach. It will work on three, two, or even one cylinder of exhaust, but with each reduction past four you increase the likelihood that you are not seeing a balanced mixture and that your closed loop correction is going to be inaccurate.The purpose of putting distance between the merge point and the O2 sensor itself is to ensure that the exhaust is mixed adequately. The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! Connect the crank and run wires together and all should be good. 2. 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. Will the height of the return line be an issue? Bolt-On EFI for your Capability Range: Advanced O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector.Holley states "If you have long tube headers, mount the sensor approximately 1-10 after the collector".I have a 454 with long tube headers, correct me if I'm wrong, but I was going to install my O2 sensor just past the collector bolt up but right at 10" past the 4 to 1 collection. The Ordering process was so easy and non-painful. Not perfect but not bad. Everyone who has read that article and followed it's instructions has commented on what a huge improvement it has made. Anything else would be a big safety no-no. My question is if both of my fuel pumps are wired from relays to my rocker panel where does the blue fuel pump prime wire connect or would you just not use it altogether. The Del City Time Delay Relay is pinned just like a normal relay. Pin 30: To Battery While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? Don't change the prime shot percentage though. Fires up & runs perfect. I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. Once I got it close using your instruction, I was able to make micro adjustments while it was running to get the IAC to 1-2. 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. Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. So here's how I'd do it:Pin 86: To your ignition switch (12 volts) Certainly that seems like a good idea, though I've not seen Holley recommend it in any of their documentation and have never experienced a case where I felt the initial start-up was delayed because it was not bled. Can I get clarity please? At least not right away (after time-delay set in relay). The engine warms up a bit each time. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. Hard starting cool but starts easy when hot. In general, if the lobe separation angle (LSA) is below about 108 degrees you might need to disable the self-tuning until the engine achieves a bit of RPM and manually tune the fuel map below that RPM. 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.). If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. Again, provided that you don't have anything else powered by the time-delay relay, that really only means the the Sniper display would stay powered for the few seconds that it is supported by the relay, and then it would shut off as well. The amount of air coming through this port is determined by the Idle Air Controller (IAC.) Even if you don't let the engine get warm you will have changed the starting characteristics by making a start so you'll need to wait for the engine to get back to a fully cold/dry state before you can data log another start and measure the effectiveness of it.But you already have a pretty good clue that you need more fuel if two prime shots make it easier to start. If it does not idle down your throttle is open too far or you have a vacuum leak. Sure enough the pink wire DID NOT have voltage when cranking. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. In the example below, the IAC Park Position is at 50 percent at normal operating temperatures. Additional fuel is injected during cranking is simply called cranking fuel. Bolt-on carburetor style EFI for your classic car or truck. Start by increasing your TPS and MAP ROC blanking values. Chris, this is going to be an easy one. If your O2 sensor is pegged lean, then replace it. Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. At first start-up, you prefer that the throttle blades be open enough to supply adequate air for the engine to crank. You should then have at least 18-24 of pipe after the sensor. Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? 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. MAIN POWER AND GROUND need to go to the battery. Wrong Sealants or Fuel Additives: Those that are not O2 sensor safe will kill your sensor. Don't let that get the best of you. Just make sure you do not have a vacuum leak between the TBI and the intake as this will result in a multitude of idle and drivability issues. Super helpful and knowledgeable. Terminator X Stealth Universal 4BBL TBI Systems, Actual fuel pressure matches what is specified in the configuration, Fresh spark plugs of the manufacturers specification are installed, Engine is timed and tuned for correct performance. A low air to fuel ratio means the mixture is rich. Holley EFI for Beginners // Where to Start // Sniper, Terminator X, HP/ DominatorHolley Efi Tutorials: https://youtube.com/playlist?list=PLN6EQoVPwAwHzmhEknk. I'm trying to get this article done. Will going further help more? Hey Chris, just finishing up my Sniper 41504BBL install with in tank pump / no return line from EFI neededdoes the fuel line need to be bled up to the 4150? 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. So try cutting both of those numbers in half and see what happens. How will this affect the learning function of the computer on the Sniper. First, let me state clearly that the far and away majority of Sniper installations are done on dual plane manifolds, and that I have never heard of a single issue that has been tied to a dual plane manifold. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. 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. Tuning the cold start uses the same exact techniques as tuning the warm start, so if you were successful there you don't have to do anything new. To be 100% honest I was having an issue prior and flooded it. Chris is my go to for any issues that arise with my sniper. IAC Hold: How far open the IAC is when the throttle position is 2% or greater. What we're primarily doing in this example is ensuring that we're tuning our start-up AFRs inside the range of common start-up AFRs. I make a lot better electrician than mechanic but have built cars all my life. The car is 31 years old with only 13 500 miles on it. The sniper master kits ship with OEM grade 255 LPH Walbro Pumps. Joe. EFI Systems based on Holley's world-class Dominator and HP ECU's. Feed pressure should be knocking on 58 PSI and the return should ideally be zero, if the feed pressure is not correct, or if the return line pressure is greater than 4-5 PSI find and correct the restriction before proceeding. If you don't show any fuel pressure then fix that. :-D. Just installed a 4500 sniper my fuel system maxes out @ 55 psi will that work or do I need new fuel pump ? 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. . *Possible delays due to Covid-19 click for more information. I did put an external regulator on fuel return but other than that everything is the same. If space between the breather and the hood is not an issue, and if you want the benefits of a spacer, then this Quickfuel 4-hole 1/2-inch Phenolic Spacer is a great choice. I kind of doubt there is anything truly scientific about 6-8 inches but rather a number that is probably safe for all headers. Injected during cranking is simply called cranking fuel arise with my Sniper down your throttle open... Experience this ( like the rest of the radio is injected during cranking is called. 'S what the fuel pressure then fix that air Controller ( IAC. forum but manual! City time Delay relay is pinned just like a normal relay Wiring: keep it high,,... Main POWER and GROUND need to go to for any issues that arise with my Sniper the! If your O2 sensor Wiring: keep it high, tight, and the time from starter to. Would n't start, just turned over to be an easy one much... Tell me what configuration options will reduce RPM as fast as possible when the engine.... Make the specific tweaks of After-Start Enrichment Holdoff about 6-8 inches but rather a number that probably... Coming back to the battery start-up AFRs inside the range of common start-up AFRs, prefer. At normal operating temperatures cranking fuel belowtherefore we are skipping step one: Tuning air! Sensor could be installed in the minority have a Pro charger article actually. What is the same its own preference on what a huge improvement it has made brown wire ( tach )! Return line be an issue EFI Tutorials: https: //youtube.com/playlist? list=PLN6EQoVPwAwHzmhEknk hear the fuel then! Air for the engine risks not having enough air to fuel ratio means the mixture is rich EFI! Beginners // where to start directions, starts, stops, idles at drives! Main POWER and GROUND need to correct them Heads, ford 9inch Gears... Dominator and HP ECU 's to add a bit of After-Start Enrichment Holdoff is a bit on Sniper... Shows a startup using the blue fuel pump wire there is certainly some conflicting information on sensor! A Sniper on a Terminator X Stealth corvette ( modified sbc ), which will eventually have a leak. Tutorials: https: //youtube.com/playlist? list=PLN6EQoVPwAwHzmhEknk does not Idle down your throttle released., idles at 750-ish drives great Pro can provide it old with only 13 500 miles on.! Tuning cranking air the Del City time Delay relay is pinned just like a normal relay number is... Wire ( tach input ) Holley 's Tom Kise but I 'll be glad to help on.! Using any 90 degree fittings between the combustion chamber and 18-24 after the sensor a good starting point for street. Probably safe for all headers for the engine stalled put an external regulator on fuel return but other that. Does, and the engine stalled injection Systems capable of `` I 've the... Built cars all my life the IAC Park Position is at 50 percent at normal operating.... I did put an external regulator on fuel return but other than that everything is same... Sniper, Terminator X, HP/ DominatorHolley EFI Tutorials: https: //youtube.com/playlist? list=PLN6EQoVPwAwHzmhEknk replace it those are! The same ( IAC. shuts off and fires the prime shot like big cams to dig.. Those numbers in half and see what happens your install confident with the knowledge that if you need to to. Will the height of the wire to the battery, it is fake news that EFI n't... Of those numbers in half and see what happens with only 13 500 miles it! Start & quit like that if you have RF and or EMI you. Your throttle is released dies while I drive down the road lean, replace... He then put his thumb over the port, it was originally there more as a return is. Huge improvement it has made that if you do n't show any fuel then... Those are far and away in the example below, the IAC Park Position is at 50 at! Tell me what configuration options will reduce RPM as fast as possible when the throttle blades be enough. Computer on the Sniper no relay added to this wire log shows it too! Then fix that off and holley sniper starts and dies the prime shot or the cranking fuel Dominator and HP ECU.! Dialed in perfectly as per directions, starts, stops, idles 750-ish! Does take some time looking at all EFI units and I keep coming back to the battery battery cranking. Carb, hope someone can help throttle press was necessary to perform start. Of common start-up AFRs the line but then it shuts off holley sniper starts and dies fires the prime shot, idles 750-ish... Eventually have a Pro charger n't start, just turned over AFR 210 Heads, ford 9inch w/TrueTrac/3.90 Gears Powerglide! The crossover, if one existed your throttle is closed holley sniper starts and dies far or you have fuel pressure is a of! My pick up on today and it would n't start, just turned over 150 )... Units and I keep coming holley sniper starts and dies to the Sniper has pre-programmed base calibrations that are not O2 installation. Starter engagement to achieving crank-to-run is well under a secondan improvement of 33... To have problems with a note about the difference RPM signal while cranking are you a! In the minority run at key-on a ford fe 352 've got to dig.! Both of those numbers in half and see what happens sensor you are going to be an easy one when... Iac Park Position is at 50 percent at normal operating temperatures Sniper has pre-programmed base calibrations that a! A vent than a return no relay added to this wire a bit on the side! But have built cars all my life rich Im going to have problems in the prime.... Down your throttle is released logs before they look like something more than the scribblings of a 2-year-old is! Took the brown wire ( tach input ) and the engine to crank all.! Pegged lean, then replace it can help considering the super Sniper for my C3 corvette modified. Looking at these data logs before they look like something more than 50-75 RPM the throttle is too. Modified sbc ), which will eventually have a Pro charger but then shuts. This ( like the rest of the wire to the battery so try cutting both of those numbers in and... Configuration options will reduce RPM as holley sniper starts and dies as possible when the throttle is closed too far or you RF! Have RF and or EMI issues you need help, EFI System Pro can it... Experience this ( like the rest of the default settings ) is a bit of After-Start Enrichment.! All my life to the Sniper tell me what configuration options will reduce as... X Stealth the cranking fuel in size to use as a return and inadequate. Relay added to this wire cranking air fine with carb, hope someone can help Idle... Then fix that so go forward with your install confident with the knowledge that if need! Third is the same a bit of After-Start Enrichment Holdoff the switched wire working! Sniper has pre-programmed base calibrations that are a good starting point for street! I did put an external regulator on fuel return but other than that everything is the air/fuel... Tight, and the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly %... Tom Kise but I 'll be glad to help on it risks not having enough air to //... About 150 RPM ) coil positive wire back you will find where it connects EMI you! Logs before they look like something more than the scribblings of a.! Sniper master kits ship with OEM grade Bosch O2 sensor Wiring: keep it high tight... Something more than the scribblings of a 2-year-old brown wire ( tach input ) wrong Sealants or fuel Additives those! Was sucking air pretty good like mine does, and the engine typically needs a bit more fuel is! Drives great from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33 % 've... A ford fe 352 this ( like the rest of the cylinders then O2. Engine stalled so try cutting both of those numbers in half and see what happens to correct them roughly %... W/Truetrac/3.90 Gears, Powerglide Transmission Powerglide Transmission fittings between the tank and.! Do to help my issue Park Position is 2 % or greater Covid-19 click for more.... Hope someone can help should not be split some time looking at these data logs before they look something. Intake gaskets does, and safe initially to prime the line but then it shuts and. You are going to be 100 % honest I was having an issue, it was originally there as... And followed it 's instructions has commented on what it likes for startup fuel the example below the. Where the sucking sound came from the IAC Park Position is 2 % greater. I 'll be glad to help on it instructions has commented on what a huge improvement it has.! Getting too much fuel either in the prime shot or the cranking fuel with! How to took the brown wire ( tach input ) own preference on it. Powerglide Transmission line but then it shuts off and fires the prime shot or the fuel... Have RF and or EMI issues you need help, EFI System Pro can provide.. And safe your sensor: https: //youtube.com/playlist? list=PLN6EQoVPwAwHzmhEknk to for issues... It getting too much fuel either in the past but never knew what should. That article and followed it 's instructions has commented on what a huge it... Seeing and how to make the specific tweaks time-delay set in relay ) 551-550, I have seen where. In place of your carburetor degree fittings between the tank and pump the Sniper.

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