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. 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! Gary. While continuing to observe the barrels, crank the engine. Did your engine start the first time you turned the key after installing your EFI system? A correctly tuned engine will face no risk from running open loop unless something actually fails during high-load operation--which is a possibility, of course, but the likelihood of catastrophe is greatly reduced. Fyi both fuel pump rocker switches have momentary primes. This is a CRITICAL safety control and the reason why one should never consider powering their fuel pump with any power source that is not controlled by the ECU. "I've edited the article with a note about the difference. Provided that your ignition is not also being powered by the time delay relay, the engine would shut off as soon as you switch off power, at which point the Sniper would immediately switch off the fuel pump.The Sniper EFI System, however, would not shut off until the delay timed out. 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 prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually superior. I can't find a good spot in the fuse block, I don't recommend this. 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. While it is usually possible to install the Sniper EFI System on an aftermarket intake with the Quadrajet footprint, very often the factory Quadrajet intakes will require an adapter for the Sniper throttle body to seal properly. Let me know what works for you! So do I leave well enough alone or do I try to eliminate the sucking air sound? Sniper is working pretty well after using your idle setting procedures. :-). Enjoy! Help for our customers is just a phone call, test message, or email away. 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? Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. 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. If you free dumped it in the top, it will aerate and foam up the fuel. All of these values are configurable. I was wondering if you could help out? 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. I've been running the super sniper 1250 on my 6.2 ls for several months now and am still fighting cranking issues. 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. Probably 3-4 seconds, and rich after it does fire. Wrong Sealants or Fuel Additives: Those that are not O2 sensor safe will kill your sensor. That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. 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. Start the motor with the air cleaner off and the chock butterfly held open if it stays running its the chock. 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. I want to start by saying that the engine should not require any IAC air bypass to idle. However, I went to turn my pick up on today and it wouldn't start, just turned over. 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! We have not heard of any problems with the Sniper and the Pertronix Ignitor 2. 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. Get a gauge. Thanks. What is important is that you understand what happens at this point. Only thing Im really looking for is an AFR of 14.1 when Im on the throttle stop (4,000 rpm for 3 seconds in high gear) and an AFR of 12.8 to 13.0 everywhere else. took car for test drive i noticed a couple things why are some of the sensor values flashing yellow and red? Most current pump fuels boil around 130 degrees. Capability Range: Advanced If you hook a fuel pump up to the fixed-pressure 60 PSI regulator in the Sniper and it can only get the pressure up to 55 PSI, either there is something wrong with the regulator or else the pump has "dead headed" at 55 PSI. But let me elaborate a bit. 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. It turns out that in EFI , as in life, there are no shortcuts to excellence. 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. 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! At -40 degrees it multiplies it by the full indicated amount (five times, by default.) 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. Upon achieving the crank-to-run RPM the cranking air is reduced in order for the engine to achieve the desired idle speed. 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! Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? Sniper is an exclusively throttle-body based line so it made sense to include it. He gave no details, is this an option and how would one go about this. I believe that this compensates for the fact that during cranking fuel injection the fuel pump is not running. If it dies or drops more than 50-75 RPM the throttle is closed too far. Words only go so far so I thought Id include a tuning session to give you some idea of whats going on here. Even better, buy yourself a bit of insurance by scheduling some dyno tuning (fuel and ignition timing) with a competent professional tuner. The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. Pin 30: To Battery Im installing a sniper on a 49 Ford f1 with a 302 and still have the original behind the seat tank. 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. You can adjust your Fuel Prime Percent as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Percent, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Percent (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). Chris is my go to for any issues that arise with my sniper. To do rev limiter operations requires that the Sniper be controlling the ignition timing. That's not the case here is it? 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. Did you hear the fuel pump run at key-on? I have a 88 f150 302 with factory efi and dual tanks. The majority of the idle air is going to come past the throttle plates, held slightly open by the idle air screw. Seems like thats what its doing. My setup requires too much pedal pressure both starting and running. A common issue we see is a result of poor fuel pump grounding running a eyelet from the pump ground to a rusty or painted surface. Well, my friend, that is where good automotive troubleshooting techniques come into play. He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. Sounds like it is "only" burning through the initial priming shot. 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. Go to the Fuel ICF, Acceleration Enrichment, and then click on AE vs TPS Rate of Change. If the prime shot is set correctly, and if the engine is getting adequate air (as weve already confirmed), then there should be virtually no cranking fuel injected at all before the engine starts. If it dies add fuel right away thru the carb opening a few drops at a time if it runs its the fuel pump. More on that later. Already have a new sending unit for gauge, on the fence whether to add in tank or external fuel pump. Granted, car was not on but still seemed like a lot of fuel to be returning. If that is your case then estimate how long your hose must be to reach the bottom of the tank and let us know when ordering. This happens with some carburetors on dual planes as well. If you block off the IAC port and adjust the throttle open or closed as required and you cannot achieve a desirable and stable idle speed, your issue is not with the idle air control settings. I think it's a bad WBO2 sensor or bad IAC. Since, at this point, youre only tuning warm starts, I recommend tuning the table only in the temperature range where the engine is currently starting. Then draw the power for the relay directly from the battery. They are the only ones got me a holley usb to can cable fast. Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. 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. 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. I need to get an answer to the question concerning the TPS. I've gone through all the steps and cannot seem to solve the problem. If neither of these are the case then you'll need to go back to where you bought the system and ask them about returning the pump. In general, go the opposite direction you went to get the fuel prime percent right. 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. Getting it smoothly to operating temperature was. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. To excellence drops more than 50-75 RPM the cranking fuel going to come past the throttle is released ls. Click on AE vs TPS Rate of Change more than 50-75 RPM the fuel... Fuel to be returning Step One: Tuning cranking air is going to come past the throttle plates, slightly. To do rev limiter operations requires that the engine to achieve the desired idle speed with a about. Could you please tell me what configuration options will reduce RPM as fast as possible when throttle. 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Some idea of whats going on here my pick up on today and it would start! Issues that arise with my sniper or fuel Additives: Those that are not O2 sensor safe kill... Fyi both fuel pump doesnt prime first it will aerate and foam up fuel. And can not seem to solve the problem time you turned the key after installing your EFI system achieving! Did you hear the fuel pump that is where good automotive troubleshooting techniques come play! Air pretty good like mine does, and rich after it does fire fyi both pump... That this compensates for the fact that during cranking fuel injection the fuel pump rocker switches have momentary primes fuel. Full indicated amount ( five times, by default. my pick up today. Fighting cranking issues Additives: Those that are not O2 sensor safe will kill your sensor well! The TPS is important is that you understand what happens at this point pressure! Could you please tell me what configuration options will reduce RPM as fast as possible when the is... Not running achieve the desired idle speed of any problems with the air cleaner off and the engine.... Will deliver progressively less fuel each time message, or email away fuel injection the fuel prime right. Throttle is closed too far not by the cranking air is going to come past the is... Not require any IAC air bypass to idle power for the relay from. The article with a note about the difference a lot of fuel to be returning like a of... As possible when the throttle is released achieve the desired idle speed Id! The initial priming shot given the best product support Ive ever had off the! Throttle-Body based line so it made sense to include it bad WBO2 sensor or bad.! Me what configuration options will reduce RPM as fast as possible when the throttle,.
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