There is certainly some conflicting information on O2 sensor installation. At that point you can start to correlate what is proper behavior and what needs correction. But I can tell you that it is possible to use a switched input to activate a 1-Dimensional Advanced Table to do an air-fuel ratio offset that would allow you to set your target AFR to 14:1. 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. Does it recover if you bump the throttle? Actually, as long as you are driving the fuel pump with the blue wire from the Sniper EFI System it will shut that down as soon as the RPM drops below the crank-to-run RPM (400 RPM by default.) 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. MAIN POWER AND GROUND need to go to the battery. 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. 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. Check your fuel pressure during installation at both the feed and return lines. We do see a massive rich dip in the AFR as soon as engine starts. Realize that what happens when you're playing with this on a cool morning with no load on the engine is not the same as what's going to happen when you are in other conditions so make your changes gradually and spend a good amount of time proving them. Then, it is apparently not getting adequate fuel in the after-start enrichment (9-12 second mark), either because the magnitude of afte-rstart enrichment is inadequate or because the after-start decay rate is dying off too quickly. It drains the battery almost dead then will fire up. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Cranking fuel lets us compensate for that drop in pressure. The switch for the starter is very temperamental and connects and disconnects easily so I would like to switch it to just a flip on option Ford Mechanic: Gary Ok, so now your fuel pressure gauge shows 50 psi or so? Regardless if you are using a Holley supplied pump or one from another source, electric fuel pumps are PUSHERS not pullers. How to install the easy to use Sniper EFI Hyper Spark Ignition System, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. Push the fuel prime percentage back up to 100% and bring your cranking fuel down (as we do in the example below.). Any suggestions? Sometimes, the thing would start and run, and other times it was most difficult to start. If you've upgraded your engine significantly then you may need to upgrade your fuel pumps as well. Tried the Holley forum but The manual states that this signal should not be split. Your engine will be dependent on cranking fuel entirely. Because of this I have electric exhaust dumps right off the long tube headers. But let me elaborate a bit. 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. If I go that far I have the option of replacing the intake, again, your thoughts? IAC Hold: How far open the IAC is when the throttle position is 2% or greater. However, I keep an AN -6 Male-Male union in my "go bag" and when I do an installation I'll generally connect the feed line to the return line right there behind the throttle body, jumper the fuel pump relay, and let it run 20-30 seconds. 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. All it knows is what it sees in the pipe. I really want to go EFI this year. It appears to be in throttle body? features . Hi, I have a 1987 Firebird with 305 engine and Quadrajet carb. As I suggest above lets start with the fuel prime percent, taking it from 150% to 100% and see what that does. And you are in luck--I wrote an article on improving the timing control on the Sniper EFI System. So do I leave well enough alone or do I try to eliminate the sucking air sound? So don't outsmart yourself here and think, "Base map only says I need 7 PPH of fuel." Presumably 60 degrees is the temperature at which the prime shot multiplier is deployed at half of the indicated amount.). transmission control and more. In addition to allowing you to replace your gaskets and the potential performance benefits, the aftermarket manifold would allow you to install the Sniper's throttle body with no adapter. This is called the fuel prime shot. 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. You mentioned its use in # 9 of the top 10 Sniper EFI installation tips. Yes, I have fuel pressure. Too little opening and the engine risks not having enough air to start. I am running a wet exhaust with O2 sensor plates. Read the instructions and Follow them. Avoid using any 90 degree fittings between the tank and pump. 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? Then I will provide an image of how this variable looks in the software. That amount of air is determined by the IAC Park Position. 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. 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. Question is, do I just plug what was the return at the throttle body? About the only thing you can try at this point is to reflash the firmware on your handheld and in the Sniper. Is the fuel pressure correct? Most current pump fuels boil around 130 degrees. We trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs (4 second mark.) The engine starts and idles great. 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! Regardless, this screw will eventually need to be adjusted. Sniper is an exclusively throttle-body based line so it made sense to include it. In most cases this is at the fuse block but in a few it is at the ignition switch itself. I mean, after all, we already have a base fuel map that provides a baseline for the fuel required by the engine to operate at this RPM. Then, reduce your after-start enrichment by about 10% in the temperature range where youre tuning. 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. Only thing I have done since last Wednesday was add Holley EFI gauges. Thanks. :-), Can you show how do you wire up the Delcity time delay relay (#74985) for use with the efi ignition dead spot. PIck a size that will not just lay flat inside your fuel cell but will actually run up the sides and back. 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. Don't let that get the best of you. This goes to show that you don't need a degree in tuning to make positive changes in the configuration of your EFI system. You will begin to notice when the system is in closed or open loop, what the target and actual AFR are, and when it is running right or running rich. 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. 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. Until then, Terminator X users will have to work with the cranking fuel table alone to create a temperature-dependent fuel shot. Don't change the prime shot percentage though. 4.56 rear gear and total weight is 2825 with me. It worked fine with carb, hope someone can help. We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. When the system is initially powered on, the fuel pump comes on for a few seconds to pressurize the fuel lines. In the case of the Sniper and Terminator X throttle bodies, when you turn that screw in (clockwise) then that is going to open the throttle blades. There is a correct setting for the idle and it sound should not be a consideration. The sole purpose of this is to prevent stalling, so change one thing at a time and if you find your engine stalling then back up a bit.The four key settings:1.) Clicking, ticking and sucking sounds. The only thing I'd point out is that when under extreme load (as you will almost certainly be when using the cut-outs) is the most risky time to be running open-loop. Please continue to write these type articles as they are invaluable to your customers. Here is where the denial starts. Maybe I am missing something here. I'm glad this approach worked for you. Exactly. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! what is the proper air/fuel ratio for a sniper on a ford fe 352? I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. None of your configuration settings will change as a result of being disconnected from power for any amount of time. Am I following this correctly or not? I have just finished installing my Holley Sniper to my 67 Camaro. At startup the pump runs a few seconds, the ECU fires a prime shot of fuel, and sometimes the presure drops a bit in the process. I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. Thanks for the kind words, Tony. If you have some part of the Hydramat in fuel it will wick that into the fuel filter. 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. The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. Sniper is working pretty well after using your idle setting procedures. Thank you for your insight! 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! Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. My solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio Offset corrections. 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. That's not the case here is it? Gary. 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. Hello, There must be an option that has been found to work. May God's grace bless you in the Lord Jesus Christ. New or not i have send dead item right off the shelf. Thank You for helping me out with my EFI system purchase during these trying times of COVID-19. Connecting a grounding strap from battery to frame with a frame to engine may have been OK for your carburetor but its not sufficient for digital electronics. So try cutting both of those numbers in half and see what happens. 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. At that point you can start taking the AFR readings into consideration IF the engine seems to be running smoothly. I've had this throttle body for a few months, haven't put 10 miles on it since I installed it. I want to start by saying that the engine should not require any IAC air bypass to idle. All of the hard starting issues were IMMEDIATELY RESOLVED both cold starting AND hot starting issues, the car still runs like a scalded dog, and the screen no longer drops out when cranking the car.IN THEORY - The throttle body and ECU is looking to control cranking fuel, starting fuel, after start fuel enrichment, and IAC positions AT START. So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? Lets go back to 100% fuel prime and turn cranking fuel down in that region by 30% and see how that affects us. Super helpful and knowledgeable. 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. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Or do as I do? Is the Sniper EFI system rev-limiter capable. Idle and cruise can be tuned leaner with "seat of the pants" feel. Am i doing the right thing? Fyi both fuel pump rocker switches have momentary primes. late-model V8 engine swaps. Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" Upon initial start-up the engine typically needs a bit more fuel than is provided by the fuel table. If you have RF and or EMI issues you need to correct them. Price Point: $$, Robust, feature-rich After-Start enrichment tuning is even more multi-faceted than cranking fuel tuning. Then is the actual amount of enrichment, which is set in the After-Start Enrichment table. Second is the fact that there are three things that you are adjusting here: Prime shot, cranking fuel, and after-Start enrichment. Also, I have not made any adjustments other than playing with the fuel prime. If you do this and your fuel pump still runs then see about returning your Sniper system under warranty. 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. *Possible delays due to Covid-19 click for more information. 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. I've not personally experienced what you describe but have read about situations where some combination of plumbing can create a harmonic that causes a clicking sound in the fuel system itself. My articles are an attempt to provide an introduction to the familiarity. There should definitely be no power to the fuel pump from the fuel pump relay until the crank-to-run RPM is reached. Great work! First, don't get too worked up about the flashing yellow and red values. The chart above is a little misleading since the word Temperature at the bottom seems to imply that the x-axis is temperature. 12/02/2009. A throttle linkage extender and a progressive linkage kit. From what I read it should not be installed vertically? 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 not, then the orientation of your O2 sensor is not your problem. First, there is the obvious--the system has to learn. https://www.msdperformance.com/suppos/#EngineRunOn, If this is your first visit, be sure to You can run resistor or non resistor plugs with the 6AL box. And the less correction you do until you understand that---the better! 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. If I let it prime twice, it starts much faster. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. To be 100% honest I was having an issue prior and flooded it. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. 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. Disable the tach sweep on your ignition box. I like to have the idle area of the fuel map about 14:1, the cruise area about 14.5:1 and the WOT area about 13:1. The A/F Ratio starts at -1.0 and decays to zero at 140 degrees. I guess I'm in the 1 to 2% of having the loud sucking sound coming from the IAC, I will keep trying to resolve this issue but it is an issue that I can most certainly live with. 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. Because that is very repeatable. Happy New Year! Lets try 75% on the fuel prime. Once engine is warmed up been driving for awhile. For the Sniper it is best to run resistor plugs. 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. There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. Not some generic pump as some have speculated. While I have different insights on a few of the finer points this is all great information that can only get you closer to an ideal solution. Bradley Iger. I have rock crawler on propane will the sniper EFI with the right fuel system work with nasty angles and articulation ? This is why most OEM EFI pumps are in the tank. So making the right buying decision means you get the support you need from a Holley Tier-III certified professional at no additional cost..If you've made that purchase decision already but would like to get some help, you're not out of luck. To do rev limiter operations requires that the Sniper be controlling the ignition timing. 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 What is proper behavior and what needs correction check your fuel pumps are in luck -- I wrote article... See what happens me out with my EFI system but will actually run up sides... The indicated amount. ) and run, and other times it was most difficult to start Sniper... Corvette 427 the sides and back intake, again, your thoughts run, and other times was... In Alaska run up the sides and back compensate for that drop in pressure to learn the. 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