It starts at 16 degrees (set for idle) goes to 23 degrees (set for cruising) and 32 degrees (set for WOT.) My situation, although related to start up, is somewhat different. If there is anything you see here that needs clarification please post a question in the comments, below. Don't change the prime shot percentage though. This first data log shows a startup using the default settings on a Terminator X Stealth. #1 I have a sniper 551-550, I dont understand how to took the brown wire (tach input). You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. 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. For this I recommend the HyperSpark Distributor. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. While it is true that, ultimately, all of the 12-volt switched power sources are connected at some point, distance is your friend. That should give you a relatively clean 12-volt switched power source for the Sniper. If I go that far I have the option of replacing the intake, again, your thoughts? There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. I won't buy anywhere else. Quick Start Tuning. I've been running the super sniper 1250 on my 6.2 ls for several months now and am still fighting cranking issues. Confession: My TPS is split and works well. 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. Sniper users take note: Always wait to depress the throttle to the clear-flood position until after you key on the system as the Sniper re-zeros the throttle position each time the system is keyed-on. There is very little downside to having IAC Park Position be too big. If you turn the ignition off and back on, & crank it, it will start & die again. Awesome Article. Chris, this is going to be an easy one. Turning the idle speed screw in the other direction (counterclockwise) will allow the throttle blades to close. Enable a 1D table3. 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? Price Point: $, Advanced throttle body injection systems capable of transmission control and more. 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. Sometimes it would catch itself, other times it would stumble and run out of breath. Several things to cover here. If it shows "Stall" instead of showing an RPM while you are cranking then you've lost your crank signal. From what I read it should not be installed vertically? Pin 30: To Battery Also check your cranking voltage if it starts hard. took car for test drive i noticed a couple things why are some of the sensor values flashing yellow and red? Would it start & quit like that if the switched wire wasnt working? 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. 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. 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.) 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. 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. If I let it prime twice, it starts much faster. The strong exhaust smell during this time indicated a very rich condition. Most import. A key at the top of each log shows the signals associated with each color. Part throttle sucking sounds. Why? Holley Sniper First Start. Do you see a very thin amount of fuel being injected evenly on all throttle plates? Direct to the battery means to the battery. 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. None of your configuration settings will change as a result of being disconnected from power for any amount of time. Find a lower price anywhere and we'll beat it by 5%! It starts fairly well. 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? If you turn the ignition off and back on, & crank it, it will start & die again. Any time that a fuel pump cannot create the regulated pressure that means it's not flowing enough fuel. To be 100% honest I was having an issue prior and flooded it. We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) Price Point: $$, EFI Systems based on We trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs (4 second mark.) Once you determine how much you adjust the cranking fuel in the warm range you can either leave the rest of the range alone to see how it starts cold or else just adjust the entire cranking fuel table by the same amount that youre using to create an efficient warm start. Cheers Darren. That's a spread of 200 degrees so half of that would be 100 degrees. Tried the Holley forum but The manual states that this signal should not be split. Yeah, I have the pink wire wired through a toggle switch straight to the battery. 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. We have not heard of any problems with the Sniper and the Pertronix Ignitor 2. If it dies again after this it must be a bad coil. 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! IAC Hold: How far open the IAC is when the throttle position is 2% or greater. to the same number as 4.) Capability Range: Advanced Hello Chris. He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. Nor can I really recommend that you split it as I have. Footage taken from Holley Carburetor Installation & Tuning DVD Winter Blowout Sale - Up To 86% Off . Thanks! Most important!!! While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? You accidentally wired the switched 12V to the accessory side of the ignition switch. 12/02/2009. I have a light flywheel and high compression - also a close ratio 6 speed racing manual trans and I need the rpms to drop asap for shifting. It is an internal combustion engine. Price Point: $, Advanced throttle body From there it is a slam dunk. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Additional fuel is injected during cranking is simply called cranking fuel. Thats because EFI isnt one of the three things that are required for the engine to run. That amount of air is determined by the IAC Park Position. He gave no details, is this an option and how would one go about this. So use a dual plane manifold with your Sniper EFI System with complete confidence.If you are not trying to keep the car completely original then replacing the intake manifold can have quite a few benefits. My fuel pump keeps running when the ignition is on but the motor is not. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. Does it matter if O2 sensor goes in drivers side with true duals?Thanks for spending your time helping us weekend mechanics. This value can be changed using either the handheld or the software but I am not familiar with a case where changing the crank-to-run RPM has been beneficial. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! I have and will continue to recommend EFI System Pro due to your outstanding services and customer support. is setting themselves up for unnecessary frustration. Increase that to 15 to start. . 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. Full product line and accessories at excellent pricing. Great work! Your assistance would be greatly appreciated. I've never seen the shop I had install my Sniper hook up a lap top to the car. As a minimum I would ensure that the system has had adequate time learning in the high-load areas of the map where you will be operating before trying this. Stay up to date with the latest releases, events, promotions and more. Upon achieving 400 RPM, the ECU turns on the fuel pump and injects the fuel specified by the base fuel map and learn table, supplemented with after-start enrichment and coolant modifier fuel (as shown below.). So if the +12 Volts "goes away" during the crucial start cycle the EFI ECU is essentially "Brain Dead" seemingly at this point. In a nutshell, you do the following:1. Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. 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. (If the Sniper does not get a RPM signal, it will not inject fuel.). Directly to the BATTERY!!! Super helpful. 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.). 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 see recommended plugs are resistor type. 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. If you do this and your fuel pump still runs then see about returning your Sniper system under warranty. i can hear the pump, but nothing is coming through the fuel line. Great article. 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. 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. 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. 2-Barrel Sniper EFI 2300 Sniper EFI C10. Price Point: $$$. I did put an external regulator on fuel return but other than that everything is the same. Regardless, this screw will eventually need to be adjusted. When one "assumes" it is EFI because they have an EFI system, well, I don't need to finish that sentence, do I? 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. I have a sniper 1250 with a msd 6014 and a painless rocker panel . Need to add fuel pump for required pressure. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. Do I still need the holley 12-753 30 amp relay. But, if it got worse, you dont want to change your Fuel Prime Percentyou have it perfect for warm starts. 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! Thanks. (Only visible with throttle bodies that have the annular rings on top of the throttle plates.). I would also point out that these settings are easier to adjust using the Sniper Software than the handheld, though either will work.There are several settings that affect how quickly the idle returns to target. sniper Installation If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! 4.56 rear gear and total weight is 2825 with me. Any suggestions? Is the fuel pressure correct? Be sure to watch the video embedded at the link above. 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. I am going to write this specific to Holleys Sniper and Terminator X throttle body EFI systems but most of this is going to apply to some degree to all advanced EFI systems intended for street use. (Note: The observant reader will note that the paragraph above is not mathematically correct but is exactly as is provided in the Sniper tuning manual. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. I have a minor leak at the 02 sensor that I am fixing now because the gasket is leaking. If cutting the percent to 100% improved your warm start but hurt the cold then increase the multiplier by one or two. More or less how do I build a timing curve?As it goes straight to these numbers with no compensation for RPM or other factors. MSD recommends non resistor plugs. Ill check the coil and see if anything else is attached. The engine (running with the Sniper default Temperature and Startup Enrichment values) surged almost violently until it reached about 170 degrees and then smoothed out and ran like a charm (after some tuning). That's not the case here is it? But what if it doesnt? The resulting resistance can burn up fuel pumps, wiring and relays. Your thoughts?In your opinion, should I keep the factory cast iron intake or should I replace it with a more efficient one. Fix that.If you have RPM then look at the pressure gauge and see if you have fuel pressure. Going Deeper: After you have some time to understand all of these different variables you might ask yourself as I did, "Why is there a separate table for cranking fuel?" Everyone who has read that article and followed it's instructions has commented on what a huge improvement it has made. Unless it is easy for you to do so, or unless you start eating through sensors on a continual basis, I probably would not recommend you changing the clocking of the O2 sensor at this point. 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 ). This is the crank-to-run RPM. But as the temperature decreases the IAC Park Position (and therefor the air allowed to pass) increases, all the way to wide open (100%.). Would love some feedback as what I need to do to help my issue. 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. I figured it would be minimal. Am I following this correctly or not? Upon initial start-up the engine typically needs a bit more fuel than is provided by the fuel table. 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. 2. Exactly. Mine did the same thing, and all I had to do was adjust the idle speed screw a little. I'm lucky to get two warm up cycles a day and then it is a moving target - but I've made considerable progress. If your O2 sensor is pegged lean, then replace it. 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.) The only issue that I have with this unit is the loud suction sound coming from the IAC port. If you shorten the harness, not only are you likely to damage the sensor you probably just short circuited your ECU. 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? It will come back up when the engine is running.If you have fuel pressure then you've got to dig deeper. When the system is initially powered on, the fuel pump comes on for a few seconds to pressurize the fuel lines. FSM Manuals Jeep Manuals. Make sure the fuel pump is properly mounted and picking up fuel. You're not running your EFI system without a gauge are you? FE 390 that currently has a Pertronix distributor with the Ignitor 2 module. Just realize that you risk aerating the fuel a bit depending on how it enters the tank. You can use that for the Dual-Sync and ignition too when you get to that point.Running the O2 sensor on a single side of the dual exhaust works fine. Third is the truth that every engine has its own preference on what it likes for startup fuel. If so then it is (regardless of what the O2 sensor says.). Fyi both fuel pump rocker switches have momentary primes. My solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio Offset corrections. But I strongly suspect that is not the case. My articles are an attempt to provide an introduction to the familiarity. Will going further help more? This is obviously an ongoing process. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. The engine warms up a bit each time. But I have never heard of anyone else who has had success doing this. Thanks, Steve! I am in the middle of plumbing my new sniper throttle body system. Do you have fuel pressure? 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? Ive ever had my new Sniper throttle body from there it is ( regardless of what the O2 sensor pegged... 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