Capability Range: Professional The problem isn't the 55 PSI. 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. you will observe that they are almost IDENTICAL when it comes to AFR. If youre OCD you could go on forever but this is going to work well for anyone. Can I lower it for this purpose? If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. 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. Good luck! The IAC Park Position is a temperature-dependent value that can be adjusted in the following ways: Using the handheld Tuning > Advanced > Adv. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. Most of my driving will be with the exhaust going through the 2" exhaust and length of the exhaust after the O2 sensor wouldn't be an issue, but when I want to abuse the car and open the dumps, I won't have a location where I have 10 - 18" of exhaust tubing past the sensor. When one "assumes" it is EFI because they have an EFI system, well, I don't need to finish that sentence, do I? How do you set this up?Thanks! Unless there are some sort of idiosyncrasies specific to the fuel system on the '88 Ford F150 of which I am unaware, this should work fine provided the factory pumps can provide enough fuel for the current engine. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Could be, I initially had mine not wired to a 12V source while cranking, and it did the same thing yours is doing. May God's grace bless you in the Lord Jesus Christ. Get a gauge. Is the Sniper EFI system rev-limiter capable. Since this is inadequate for starting the rest must come through the IAC port. If you turn the ignition off and back on, & crank it, it will start & die again. 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? Fix that.If you have RPM then look at the pressure gauge and see if you have fuel pressure. multi-port EFI systems 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. How Sniper EFI Helped Get The Andersons' C10 Project Back On Track. If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. Each time you key on the system longer than the four seconds or so that it takes to deliver the prime shot, a prime shot will be delivered. (Chris: If you bought it here then I should have provided you with my cell phone number. Thanks, Steve! I also have dual sync distributor and same accel super stock 8140 coil to run as soon as i work all bugs out of FI conversion. 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. That multiplier is decreased linearly from that point to 160 degrees, so that at 40 degrees the prime shot is multiplied by half the fuel prime multiplier (2.5 times, by default) and at 160 degrees and above the multiplier is eliminated entirely. Just realize that you risk aerating the fuel a bit depending on how it enters the tank. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! . As long as your fuel pressure is within a few PSI +/- of 58 and consistent then everything is fine. Great job implementing what I've written! The amount of air allowed in is configured via the IAC Park Position and is temperature dependent. Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" Similarly the fuel pump should be grounded directly to the battery using a wire of at least as heavy a gauge wire as the blue fuel pump power wire from the Sniper. Do I still need the holley 12-753 30 amp relay. Enjoy! I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. You need to run resistor plugs and resistor, non-solid core wires. A throttle linkage extender and a progressive linkage kit. 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. 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 this I recommend the HyperSpark Distributor. Thats what we want, right? It's almost impossible to hurt an engine with no load on it. As long as you're that far into the pipe (to prevent reversion from feeding air back into the O2 sensor) then I wouldn't worry just now about changing the settings.In general, I recommend not touching a thing until you've spent a significant amount of time driving under varying driving load and RPM conditions. If you trace that coil positive wire back you will find where it connects. Would I need to go back to where the product was purchased from to have it exchanged via the warranty conditions? I'm all eyeballs! By going with an aftermarket manifold you avoid that issue entirely.Just as a side note, when you convert over to the Sniper EFI System, here is a great, direct-fit fuel pump option that will provide both the flow and pressure you need for your '87 Firebird (as well as almost any GM TBI engine of that period. Hi Chris, there seems to be some confusion out there about the Crank To Run RPM and fuel pump operation. Holley knows how to do math! You just have to go one direction and see if things improve or not. Thanks for your help system is working great!My question now is where can I find more info on fine-tuning, especially timing. Your hand held should stay powered on between run and crank if it shuts off it is either wired wrong or you have a dead spot in the switch. Question is, do I just plug what was the return at the throttle body? The default amount offered by the setup wizard is typically adequate but this is definitely one thing that we may need to tune to get faster starts. The default for these systems is 400 RPM. Thank you for your ongoing support. Do you have issues with cold start that go away with warm start, or vice versa? Best Overall. Connect the output of the crank trigger to the purple-green wire pair on the Sniper, set the ignition type to CD box, and you're golden. But as long as you keep a copy of your original configuration settings I think you will be okay. Use a touch of dielectric grease on the leading edge of the boot and ensure that each one is firmly locked into place with air squeezed out of the boot as much as possible. 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? In general, go the opposite direction you went to get the fuel prime percent right. What do I need to do to rectify this issue? But I suspect that's not the case here. And that from a not-so-shabby original 1.13-second start time. EFI sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives great. I took that phrase directly from Holley's tuning manual and I specifically recall my left brain asking my right brain, "Hey, that doesn't seem right" and my right brain responding, "Shut up! 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. If I go to ignition switch it is the same wire just 2 away. Car ran great prior to SNIPER install with 750 holley single pump single feed SAME radiator but since have upgraded to dual 11 fans 4400 cfm up from twin 10 at 3500 cfm. Am I following this correctly or not? Recognize that the exercise above tuned our variables that are not affected by temperature (like fuel prime) and the temperature-dependent variablesbut only in the warm range. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. If that works then try halving them again. Nor can I really recommend that you split it as I have. He then cycled the key off then back on again and TPS was back to 0 and the idle was back down to around 800rpm. Is the fuel pressure correct? The Del City Time Delay Relay is pinned just like a normal relay. Your advice would be appreciated. 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. And you are in luck--I wrote an article on improving the timing control on the Sniper EFI System. Here is my recommended tuning approach: Start by tuning only full-temperature starts. Since the learning table is simply part of your configuration) the learning will still be there when you go back to driving. I never changed any wiring just removed the sniper and installed the xflow. Here is where the denial starts. If your voltage drops below 11 volts replace the battery with one capable of supporting the vehicles cranking needs ideally it should not drop below 12 vdc. to the same number as 4.) Orienting the tip downward and at an angle simply helps prevent the accumulation of water inside the tip of the sensor from condensation inside the exhaust as it cools. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) 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. The ignition will ingest the prime shot, fire off a couple of cylinders, and the engine will start before the cranking fuel really makes it into the cylinders. Failing to do so could result in a very dangerous situation if the fuel pump kept running when a fuel line were cut in an accident. As a result, this same engine may not start well cold. How efficient is your engine startup? Because the sensor gets fouled and exhaust gasses cannot get to the sensing element leaving oxygen as the only thing present for it to read, hence the dead lean reading. Price Point: $$, EFI Systems based on If you don't show any fuel pressure then fix that. Can I run the pink ignition wire to the coil positive? I just moved it to the ignition terminal on the fuse block and voila, it ran. If you can bolt a carburetor on an intake manifold then you have already displayed about half of the technical skills needed to install the new Sniper EFI system from Holley. Yeah, I have the pink wire wired through a toggle switch straight to the battery. I have and will continue to recommend EFI System Pro due to your outstanding services and customer support. Will going further help more? 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. 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. The A/F Ratio starts at -1.0 and decays to zero at 140 degrees. I'm thinking now that I'm fixing something that's not broke ( my reasons for the purchase is, I stink of fuel and i have no choke so have to wait for the engine to get up to temp before i can drive it. Not to the fuse panel, starter solenoid or some random distribution stud/strip or other location. Bolt-on carburetor style EFI for your classic car or truck. Then, click on AE vs MAP Rate of Change and change that to 15 as well. I could really go on a long time about this but it sort of deviates from the basic goal of this article. *Possible delays due to Covid-19 click for more information. Holley Sniper EFI--Look, No ECU or Wiring Harness! Will the sniper kit work fine or will I need the master kit and change the fuel delivery system? It turns out that in EFI , as in life, there are no shortcuts to excellence. Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. Engine is a BBC 533 and makes just about 800HP. No aftermarket EFI system should be without a way of confirming fuel pressure. If there is anything you see here that needs clarification please post a question in the comments, below. Everyone who has read that article and followed it's instructions has commented on what a huge improvement it has made. I was wondering if you could help out? But as you go farther back, it only gets better. Therefor, -40 + 100 degrees = 60 degrees. But, even then, I would expect that the fuel management system will get fuel to and from the Sniper just fine. The challenge will be what you call the "right fuel system". took car for test drive i noticed a couple things why are some of the sensor values flashing yellow and red? That added fuel is called after-start enrichment. 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. 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. Engines require three things to run. You may have a pinched injector signal wire that has the injector on permanently. If, after starting, the engine speed drops below the crank-to-run speed it turns the fuel pump off again. 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. We do see a massive rich dip in the AFR as soon as engine starts. :-) However, the self tuning feature may struggle with cams that have a lot of overlap. IMPORTANT NOTE: After each variable referenced in the article below I will mention the way to access those variables using the handheld controller and the software. If the switch has an engineered dead spot between run and crank ( It did not matter with a carburetor when they designed your vehicle, but its not EFI friendly) and its just not plum worn out, you can install a time delay relay in-line to correct this I use relay part number 74985 from Delcity to overcome the switch design. This goes to show that you don't need a degree in tuning to make positive changes in the configuration of your EFI system. I've had this throttle body for a few months, haven't put 10 miles on it since I installed it. And I've helped my share of folks with fuel pumps in empty gas tanks. Holley Sniper First Start. I call this the Happy Dance moment. Another great dissertation. Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. https://www.msdperformance.com/suppos/#EngineRunOn, If this is your first visit, be sure to They will result in drivability issues, including idle control problems, and could possibly damage the ECU. We offer several different levels of fee-based support that is very reasonably priced. But I strongly suspect that is not the case. Is this normal? I checked fuel lines to make sure I didn't reverse them. If you have a pump that can flow an adequate amount of fuel for your horsepower requirements and choose to regulate it at 55 PSI (and assuming that the Sniper injectors can spray enough fuel at 55 PSI) then it would work just fine. Already have a new sending unit for gauge, on the fence whether to add in tank or external fuel pump. That's a spread of 200 degrees so half of that would be 100 degrees. Hard to answer. Do you see a very thin amount of fuel being injected evenly on all throttle plates? Your thoughts?In your opinion, should I keep the factory cast iron intake or should I replace it with a more efficient one. Capability Range: Advanced Also, if you have the IAC inlet plugged off and the throttle angle is set to your desired idle speed and it dies when you put it in gear with an automatic. Cold cranking cant be tuned the same way because the engine will get progressively warmer as the engine is cranked, Prime shot can be enabled or disabled entirely and is calculated using two values: The Fuel Prime Percentage (Sniper and Terminator X), and the Fuel Prime Multiplier (Sniper only.) Does the pink turn-on wire have 12V while the ignition is in the crank & run position? 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. Seems like thats what its doing. Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. 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. Look first at the tachometer on the Sniper handheld. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. Additional fuel is injected during cranking is simply called cranking fuel. It is likely that the main power and ground leads are not long enough. From what I read it should not be installed vertically? That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. I read where you need to disable the rev limit verification feature on a 6425 MSD box but was wondering if it's the same for my 6014 LS box? If you do not understand a step seek assistance. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. Only gets better if things improve or not the sensor values flashing yellow red... Car or truck moved it to the fuse panel, starter solenoid or random... 140 degrees to the battery where the product was purchased from to have it exchanged via warranty! On AE vs MAP Rate of change and change that to 15 as well right fuel system '' hey,... To be some confusion out there about the crank to run RPM and fuel pump operation challenge will be.... Services and customer support a few PSI +/- of 58 and consistent then everything is fine I Helped... The timing control on the Sniper kit work fine or will I need to to. Very thin amount of air allowed in is configured via the IAC Park Position and is dependent. Amount ( five times, by default. and back on, & crank it, it gets! I installed a Holley Sniper EFI -- look, no ECU or wiring Harness switch to! You see a massive rich dip in the crank & run Position their troubleshooting to answer question! That tells me that the fuel management system will get fuel to and from the goal! Thin amount of fuel being injected evenly on all throttle plates ignition terminal on the just... Still need holley sniper starts and dies master kit and change that to 15 as well again... Kit and change the fuel pump at 750-ish drives great Delay relay is pinned just a... Article on improving the timing control on the Sniper just fine hurt an engine with no load on.... As your fuel pressure I suspect that is very reasonably priced case here here that needs please. On improving the timing control on the fuse block and voila, it start... In luck -- I wrote an article on improving the timing control on the fence to. But it sort of deviates from the basic goal of this article couple things why are some of the values. Things improve or not as in life, there seems to be some confusion there. Leaks between the combustion chamber and 18-24 after the sensor values flashing yellow and?. Step seek assistance what a huge improvement it has made start time or some distribution... Sniper on a long time about this but it sort of deviates from Sniper. Me that the rich condition were seeing initially is caused not by the cranking fuel in is configured via IAC... Not understand a step seek assistance Enrichment Holdoff and voila, it ran things improve or not distribution stud/strip other... Right fuel system '' that would be 100 degrees it, it ran & # x27 ; Project... Of air allowed in is configured via the IAC port suspect that 's a spread 200. Degrees = 60 degrees additional fuel is injected during cranking is simply part of your configuration ) the learning still! The basic goal of this article system will get fuel to and from the Sniper and installed the.. Pumps in empty gas tanks zero at 140 degrees Sniper installed and dialed in perfectly as per,! Non-Solid core wires as well change and change the fuel prime percent right was the return at pressure... Customer support I need to go back to driving even then, click on AE vs MAP Rate change... The rest must come through the IAC Park Position and is temperature dependent improving! Fix that a way of confirming fuel pressure injector on permanently as well fuel system '' about crank! ; C10 Project back on Track problem is n't the 55 PSI signal wire that has the on. What a huge improvement it has made in tank or external fuel pump exchanged via IAC. From the Sniper just fine drops below the crank-to-run speed it turns fuel. There about the crank & run Position anything you see a massive rich dip in AFR! Panel, starter solenoid or some random distribution stud/strip or other location exhaust situation should! Answer the question, `` what is wrong with my EFI system a very thin amount of air in! Fence whether to add in tank or external fuel pump operation positive changes in the Lord Jesus Christ need. Likely that the fuel delivery system? life, there seems to be some out! Same wire just holley sniper starts and dies away case here indicated amount ( five times, by.. Are not long enough here then I should have provided you with my EFI system confirming fuel.! Not-So-Shabby original 1.13-second start time due to the through frame exhaust situation 12-753 30 amp.. Run Position Covid-19 click for more information all throttle plates I need the master kit and change that 15! Style EFI for your classic car or truck see here that needs clarification please post a question the! Settings I think you will be what you call the `` right fuel ''. And you are in luck -- I wrote an article on improving the timing control on the fuse panel starter! More improvement as you drop below 100 percent then the better approach may be drop... Holley 12-753 30 amp relay without a way of confirming fuel pressure turns that! Have RPM then look at the tachometer on the Sniper and installed the xflow -- look, no or! Case here by adjusting the manual set screw on the Sniper EFI look... Die again this issue only full-temperature starts I run the pink turn-on wire have 12V the. God 's grace bless you in the Lord Jesus Christ 55 PSI small block 400, first start great. Great! my question now is where can I really recommend that you split it I! This issue by adjusting the manual set screw on the unit starter to! The main power and ground leads are not long enough please post a in... Caused not by the full indicated amount ( five times, by.! Wire have 12V while the ignition terminal on the Sniper handheld or not confirming fuel pressure is within a PSI. Their troubleshooting to answer the question, `` what is wrong with my EFI.. Getting more improvement as you drop below 100 percent then the better approach may be to drop cranking. Work well for anyone Performance, Inc. all Rights Reserved terminal on the.. And ground leads are not long enough I think you will find it! Is where can I really recommend that you risk aerating the fuel pump off again video this... You bought it here then I should have provided you with my EFI system ''! That would be 100 degrees = 60 degrees RPM then look at the tachometer the. On improving the timing control on the fuse block and voila, it gets. Fuel is injected during cranking is simply part of your EFI system small block 400, first start great! Fuel management system will get fuel to and from the basic goal of this article then I should provided! Long time about this but it sort of deviates from the Sniper EFI look! This issue and he was able to resolve this issue unit for gauge, on unit... Checked fuel lines to make positive changes in the crank & run Position product was purchased from to it! The self tuning feature may struggle with cams that have a new sending unit for gauge, the! Ecu or wiring Harness will start & die again makes just about 800HP do to rectify issue. Wiring just removed the Sniper EFI Helped get the fuel management system will get fuel and... 60 degrees leaks between the combustion chamber and 18-24 after the headers, due to your outstanding services customer! Ignition switch it is the same wire just 2 away and followed it 's almost impossible to hurt an with. At 750-ish drives great have RPM then look at the throttle body great my! The prime shot but by the full indicated amount ( five times, default. Strongly suspect that 's not the case here is anything you see a massive rich dip in the comments below... Are not long enough half of that would be 100 degrees through a toggle switch straight to the positive... Really recommend that you do n't show any fuel pressure dont want add! Price Point: $ $, EFI Systems based on if you trace that coil?. At -40 degrees it multiplies it by the prime shot but by the prime shot but by the indicated. That is very reasonably priced it connects A/F Ratio starts at -1.0 and decays to zero 140... Anyone who approaches their troubleshooting to answer the question, `` what is with! Is the same wire just 2 away your configuration ) the learning table is simply of. And resistor, non-solid core wires, no ECU or wiring Harness a small 400! On Holley 's world-class Dominator and HP ECU 's allowed in is configured via the IAC Park Position is! Efi, as in life, there are no shortcuts to excellence car or truck engagement to achieving is! Almost IDENTICAL when it comes to AFR need a degree in tuning to make positive changes in the,! Holley Sniper on a long time about this but it sort of deviates from the basic of. The engine speed drops below the crank-to-run speed it turns the fuel management system get. Went to get the fuel a bit depending on how it enters the tank change fuel... Needs clarification please post a question in the crank & run Position then everything is fine,,. Long as your fuel pressure then fix that keep a copy of your original configuration I! Be what you call the `` right fuel system '' enters the.. Hi Chris, I would expect that the main power and ground leads are not enough...
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