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. Most import. 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. So I can't tell you what TPS to use. That's a spread of 200 degrees so half of that would be 100 degrees. And the less correction you do until you understand that---the better! 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! You may have an injector connector that has come loose.A final note that I can't emphasize enough. Do I still need the holley 12-753 30 amp relay. But I'm confident that once you wire it this way you will not have the problem anymore. 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. Make sure the fuel pump is properly mounted and picking up fuel. Price Point: $$$. There is a correct setting for the idle and it sound should not be a consideration. I'm lucky to get two warm up cycles a day and then it is a moving target - but I've made considerable progress. Get your engine running RFI-free and then you can play with increasing the gap if you'd like. This happens with some carburetors on dual planes as well. injection systems capable of For the Sniper it is best to run resistor plugs. You will still get a prime shot each time you key the system on but once you start cranking it will not deliver cranking fuel and should eventually clear itself of the flooded situation and fire. 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. Resistance results in heat and heat results in more resistance. You might want to try changing around the plumbing a little bit and see if that helps. Have you ever watched a post nuclear apocalypse movie? Some good info here thank you. Holley Sniper First Start. I am having a 2 572 BBC being built for my boat. As mentioned above, if you get the prime shot dialed in perfectly you hardly use cranking fuel before achieving the crank-to-run RPM. Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. Where do I start looking for the solution? Regardless, this screw will eventually need to be adjusted. The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. To orient you a bit, in each image below youll see that the log starts right at the point where the battery voltage (upper green trace) dips due to the engagement of the starter and continues until the IAC Position (aqua-marine trace) ramps down from the park position and then to where it is again controlling the idle speed. The resulting O2 sensor failure is damaged not defective. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. All seemed well with the setup and going through the handheld. Whether you tune via the handheld or software you are provided with a graph showing IAC parked position at the left and coolant temperature across the bottom. ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. Free ground shipping regardless of order size! I tried the external inline pump while installing the 2300 in my 78 cj-5. There is certainly some conflicting information on O2 sensor installation. 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 . Nothing else (except gas), In a no-start situation my direction is always the same. 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. If you do not disable it you will fight startup issues, flood the engine and damage your O2 sensor. If it cranks better then you know you're getting too much fuel. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. That being the case, it may take a bit longer to crank for lack of adequate fuel. They are the only ones got me a holley usb to can cable fast. Why? Should the fuel pressure hold steady while the engine is operating as when the key is on but not starting or should the pressure readings be oscillating rapidly in a frequency that seems to match the clicking noise emitting from the tbi. 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! How Sniper EFI Helped Get The Andersons' C10 Project Back On Track. I have a question about the Time-delay relay above (#9 in the top 10) If you wire it this way it seems that the pump will now not shut off when the key is return to the off position. If you don't show any fuel pressure then fix that. 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. Too little opening and the engine risks not having enough air to start. Part throttle sucking sounds. To be 100% honest I was having an issue prior and flooded it. Get a gauge. Can I use this for the return.Thanks for the help, I just installed a Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake. He gave no details, is this an option and how would one go about this. It seems to be going threw gas faster then it should. Getting the engine running was never a problem. Even when you suspect the sound is associated with the IAC, you don't want to set the idle based on how much sound the IAC makes. What I've read indicates this comes from the fuel pressure regulator and is often associated with systems that happen to have 90-degree fittings (though not always.) 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. 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? 10-09-2018, 10:11 PM Installed my Sniper, went through the startup procedure. Did your engine start the first time you turned the key after installing your EFI system? If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. At the bottom you'll see AE vs TPS RoC Blanking. superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 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. And that from a not-so-shabby original 1.13-second start time. 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. 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. Fires up & runs perfect. Holley's Dominator and Once engine is warmed up been driving for awhile. I have read and re-read all of the info about the idle issues and I have no idle issues on first start up to running temp of 190 degrees. But I have never heard of anyone else who has had success doing this. That clicking sound you may be hearing is most likely the fuel injectors cycling, this sound is often more pronounced at Low RPM. Increase that to 15 to start. I've gone through all the steps and cannot seem to solve the problem. My car idles beautifully @ about 800rpm. I have two questions at this time: 1. Just recently installed the Xflow and my AFR is reading is 15 no matter what I do, engine is running ridiculously rich but the AFR is not changing at all is this an ECU problem or is there some things I can try doing before I pull it off and send it back to holley? Avoid using any 90 degree fittings between the tank and pump. So do I leave well enough alone or do I try to eliminate the sucking air sound? In fact, MOST of the points on the fuse block don't do that! I was wondering if you could help out? Holley EFI for Beginners // Where to Start // Sniper, Terminator X, HP/ DominatorHolley Efi Tutorials: https://youtube.com/playlist?list=PLN6EQoVPwAwHzmhEknk. If that happens it will be obvious as it will usually catastrophically impact the sensor, destroying it and sending the reading to a permanent full-lean conditions. Lets dig down into that a bit and see if we can help. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. Since this is inadequate for starting the rest must come through the IAC port. I see recommended plugs are resistor type. Hello, We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. Why? That is not the case. Starts & immediately dies. One of the most common causes of poor idle is improper O2 sensor placement or trying to run closed loop at idle with a cam that exhibits quite a bit of overlap at low RPM. Capability Range: Professional But as the temperature decreases the IAC Park Position (and therefor the air allowed to pass) increases, all the way to wide open (100%.). Not some generic piece as some have speculated. And it may have improvedor it may have gotten worse. Fuel must also be added to start the engine. All it knows is what it sees in the pipe. The challenge will be what you call the "right fuel system". Capability Range: Advanced I usually recommend making note of them, ignoring anything that common sense says needs no attention, and plan to dig into the instruction guide a bit down the road and reset these to values that make more sense.Likewise, anywhere past the collector is going to be just fine as long as you are not within 18 inches (preferrably) 10 inches (absolute minimum) from the end of the pipe itself. My first rule: There has never been an engine that didnt start because EFI. Chris is my go to for any issues that arise with my sniper. First, remember that after-Start enrichment is not a fixed value. Is this normal? Just realize that you risk aerating the fuel a bit depending on how it enters the tank. I would add that this noise might occur in 1% - 2% of the cases so I don't generally recommend buying this spacer with the Sniper EFI System. Presumably 60 degrees is the temperature at which the prime shot multiplier is deployed at half of the indicated amount.). May God's grace bless you in the Lord Jesus Christ. Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. Would love some feedback as what I need to do to help my issue. If there is anything you see here that needs clarification please post a question in the comments, below. I discuss idle setting procedures at some lenth here and you'll note that I never mention sound. Not all 12 volt switched sources in the fuse block of a 55 year old car do this! If it is more than about 5 PSI one way or the other, or if it changes under different operating conditions, then you should look into that. If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. Well, my friend, that is where good automotive troubleshooting techniques come into play. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. Directly to the BATTERY!!! Best Overall. 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. Would I need to go back to where the product was purchased from to have it exchanged via the warranty conditions? If you do not understand a step seek assistance. Do you have fuel pressure? The Del City Time Delay Relay is pinned just like a normal relay. None of your configuration settings will change as a result of being disconnected from power for any amount of time. Price Point: $$, EFI Systems based on Great job implementing what I've written! Do you have issues with cold start that go away with warm start, or vice versa? 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 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. I think my tach is on there. Turn your prime shot down (I think I run about 75% and NEVER let it fire its prime shot when the engine is warm. But let me elaborate a bit. PIck a size that will not just lay flat inside your fuel cell but will actually run up the sides and back. By doing this you ensure that the Sniper can cut fuel off when the engine is not running. (Dont forget and then later wonder why it wont start!). But you can extend the leads using wires of an equal or heavier gauge. While setting the cranking air is simple (add a bunch and then tune it back where it doesnt over-rev) setting the cranking fuel is a bit more challenging. If the engine starts but is extremely rough-running were still in the guessing stage because misfires are going to cause the AFR to read lean. Air is not just coming into the engine via the throttle blades. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. But what if it doesnt? (If the Sniper does not get a RPM signal, it will not inject fuel.). Unfortunately, I know NOTHING about throttle stops. You can find that here. Capability Range: Advanced In fact, if you overlay these two data logs with the comparison feature (did you know there is a comparison feature built into the data log viewer?) You might note that with warmer coolant temperatures less air is provided for cranking. Hi Chris, there seems to be some confusion out there about the Crank To Run RPM and fuel pump operation. I have a 428 fe with a MSD Blaster 2 Ignition Coil, MSD Ignition Pro-Billet Ready-to-Run Distributor Ford FE, but that's all. The only issue that I have with this unit is the loud suction sound coming from the IAC port. Because all it knows is the specified system pressure, which doesn't exist at this point. That delay is called After-Start Holdoff. 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 your pressure drops the system will react by adding fuel in closed loop and lean. Thanks for the kind words, Tony. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. The process for the wiring is simple and it has been wired as per the directions and to what you have quoted to me above.In order for me to return the Sniper, what would the process be? Like many others, EFI System Pro allowed me to dial a new Holley Sniper. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. After reading through numerous threads on the Holley Sniper Forum about similar hot start problems it appears that you need to download Holley's software to a lap top (which I don't own), and program the starting fuel pressure to the temperature of the coolant. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Out of the box, Holley normally has their idle speed screw set at 2 to 2 full turns beyond the point where the screw first hits the throttle lever. The images are NOT intended to provide you with the values you should be using in your configuration. 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