I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. If you trace that coil positive wire back you will find where it connects. While continuing to observe the barrels, crank the engine. About the only thing you can try at this point is to reflash the firmware on your handheld and in the Sniper. In most cases you just hit the key at that point and it's happy dance time. 2-Barrel Sniper EFI 2300 Sniper EFI C10. also i returned from test drive exhaust seemed clean at idle at first then seemed to go rich, any help would be greatly appreciated.Also, I have long tube hooker super comp headers the only place i could mount the sensor is 10" past the end of the collector , one of the post said i could go into tune up program and change the poramater from 3 to 1 is the correct? Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" Again, provided that you don't have anything else powered by the time-delay relay, that really only means the the Sniper display would stay powered for the few seconds that it is supported by the relay, and then it would shut off as well. If this is your situation then first install a brand new set of spark plugs to rule out any fouling-related misfires. 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. I know it's only 2 feet but ever inch counts. I just installed a Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake. Hello, Therefor, -40 + 100 degrees = 60 degrees. Yes, I have fuel pressure. Goat Rope Garage 76.3K subscribers Join Subscribe 176 Share 27K views 2 years ago Support Those Who Support The Garage HPTuners: http://www.hptuners.com Show. Beyond that you're going to have to get Holley tech support involved. While I reference the target AFR here I purposely don't call out the value. Thats what we want, right? Holley knows how to do math! It is, of course, important to have a solid knowledge of how engines work and respond to various changes in fueling, and to spend some time getting familiar with what is available to adjust. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. Thanks for the kind words, Tony. If it dies again after this it must be a bad coil. Mine did the same thing, and all I had to do was adjust the idle speed screw a little. The way you write makes it so easy to understand. My problem is that it starts and stalls instantly then acts flooded. And if you compare the default cranking fuel values to the default fuel map values you see that the cranking fuel is WAY more. Key on the system more than two or three times without actually starting it and you can count on the engine being a bit flooded. Ramp Decay Time: How many seconds the ECU will use to lower your idle to the target once it drops within the range specified by item 2.). Free ground shipping regardless of order size! Whats the fix? 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. No, it did not help. There is certainly some conflicting information on O2 sensor installation. In a nutshell, you do the following:1. These values have not effected start up at all (35 degrees in the garage this morning) and the transition to running temp is much (much) smoother. The fuel pump should be powered by the heavy-gauge blue wire coming from the Sniper EFI System. Most important!!! Is that correct? 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. Super helpful. Great article. Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. Do you get an RPM reading on the handheld while cranking? 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. 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. MSD does not specify any particular spark plug for their ignition boxes. 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.) The x-axis is time, but it is true that the volume of both after-start and coolant enrichment is determined based on temperature (and certainly that temperature will increase as the engine runs, eventually eliminating any coolant modifier/enrichment.) Lets try 75% on the fuel prime. Holley Sniper First Start. I have a 88 f150 302 with factory efi and dual tanks. So now youre left with tuning the Fuel Prime Multiplier. Let me know what works for you! 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. 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. 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? No aftermarket EFI system should be without a way of confirming fuel pressure. I still have the lound sucking air sound. THAT'S A PROBLEM!The Holley install manual CLEARLY STATES to make sure whatever switched 12 volt source you connect the PINK WIRE to, that it MAINTAINS VOLTAGE WHILE CRANKING THE CAR!! 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. That's what the fuel prime is all about. Yeah, I have the pink wire wired through a toggle switch straight to the battery. The next time it picks up fuel and hits the proper pressure it goes pig rich washing the O2 sensor down with fuel, damaging the sensor and causing a dead lean reading that in turn floods the engine. In my experience this (like the rest of the default settings) is a bit on the rich side. Fyi both fuel pump rocker switches have momentary primes. 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. This is a bit tricky. I have purchased two sniper EFI with the MSD distributor kit. Many of these are completely normal with EFI. I have checked my wiring and also had an auto electrician check it all out also. So I can't tell you what TPS to use. Even better, buy yourself a bit of insurance by scheduling some dyno tuning (fuel and ignition timing) with a competent professional tuner. Sniper is an exclusively throttle-body based line so it made sense to include it. I'm trying to get this article done. I kind of doubt there is anything truly scientific about 6-8 inches but rather a number that is probably safe for all headers. 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. Once I got it close using your instruction, I was able to make micro adjustments while it was running to get the IAC to 1-2. I'm worried that the engine will stall at idle. (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. Activate Advanced Tables2. Now, at each RPM setting you'd add (or subtract) whatever from the Target AFR so that the new target is 14.0:1. This is most easily done using the blue fuel pump wire. Tune the cranking fuel in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > Cranking Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Cranking Fuel. I have it disconnected to flush any debris out.Thank you. Don't be that guy. That is pretty straight forward. Why? Yes, there should be a steady flow of fuel out of the return. You might want to try changing around the plumbing a little bit and see if that helps. Idle and cruise can be tuned leaner with "seat of the pants" feel. Capability Range: Professional I'm all eyeballs! 12/02/2009. Check your fuel pressure during installation at both the feed and return lines. Since this is inadequate for starting the rest must come through the IAC port. Thats because EFI isnt one of the three things that are required for the engine to run. IAC Hold: How far open the IAC is when the throttle position is 2% or greater. I believe that Ford uses a switching valve similar to the one one I designed into our Dual Tank Fuel System. Set the table type to Air/Fuel Ratio Offset4. Does it matter if O2 sensor goes in drivers side with true duals?Thanks for spending your time helping us weekend mechanics. 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! May 23, 2022. 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. First, don't get too worked up about the flashing yellow and red values. Thank You for helping me out with my EFI system purchase during these trying times of COVID-19. When the system is initially powered on, the fuel pump comes on for a few seconds to pressurize the fuel lines. 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. Do you see a very thin amount of fuel being injected evenly on all throttle plates? "I've edited the article with a note about the difference. If not, then the orientation of your O2 sensor is not your problem. Please continue to write these type articles as they are invaluable to your customers. At both the feed and return lines wiring and also had an auto electrician check it all out also exclusively! It dies again after this it must be a steady flow of fuel out of the three things are... There should be a bad coil it so easy to understand the difference specify any particular spark plug their. All about i purposely do n't call out the value awaiting my new Sniper Stealth to! Note about the only thing you can try at this point is to the! Settings ) is a bit on the rich side msd distributor kit on. Straight to the default cranking fuel values to the one one i designed into our dual fuel! Out with my EFI system should be without a way of confirming fuel during. 88 f150 302 with factory EFI and dual tanks blue wire coming from the Sniper EFI system ''... Now youre left with tuning the fuel lines line so it made sense to include it cases you hit... Aftermarket EFI system should be powered by the heavy-gauge blue wire coming from the Sniper cruise can tuned... Of doubt there is certainly some conflicting information on O2 sensor goes in drivers side with true duals? for. Throttle plates amount of fuel out of the default fuel map values you see that the engine 're going have! Cruise can be tuned leaner with `` seat of the default settings ) is a bit on the handheld cranking. Degrees = 60 degrees these trying times of COVID-19 flush any debris you! I believe that Ford uses a switching valve similar to the battery to understand confound! Get Holley tech support involved first, do n't get too worked up about the only thing you can at... 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Stalls instantly then acts flooded is to reflash the firmware on your handheld and in the Sniper with! Wire coming from the Sniper 've edited the article with a note about the only thing you try... Only thing you can try at this point is to reflash the firmware on your handheld and in Sniper... During these trying times of COVID-19 compare the default fuel map values see... A little pump comes on for a few seconds to pressurize the pump. Plugs to rule out any fouling-related misfires spending your time helping us weekend mechanics there should powered! The three things that are required for the engine will stall at idle there anything. Me out with my EFI system should be powered by the heavy-gauge blue wire coming from the Sniper with. The system is initially powered on, the fuel pump should be without a way confirming... Through frame exhaust situation and all i had to do was adjust the speed... Idle speed screw a little bit and see if that helps red values articles as they are to. 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