Holley sniper problems (3 Viewers)

[Advrider639]

Hey everyone!

Been a while, but want to report back. I’ve done two things to the 40 and it is running better than ever!

-Trimeki headers. These fixed my small vacuum leaks from the flange thickness.
-New o2 sensor. Old one was cooked.

Rock solid AFR and fuel pressure, IAC is good, RPMs do what they should. I’m going to pile on the miles now and hopefully let the sniper handle the fine tuning.

Best of luck to everyone getting theirs set up. Key is 100% no vacuum leaks, solid fuel pressure, and a functioning o2 sensor.

 

[cstav86]

To add on to @Advrider639 comments, I just recently had issues with my AFR being off. Found that the exhaust was leaking through the heat riser bushing. Was able to weld enough on it to stop the leak and the AFR is back behaving as it should. These systems are great, but the slightest vacuum or exhaust leak can really affect it.

 

[JKIII FJ40]

I have a brand new Sniper here leaking fuel out of the injector body externally, and in the same boat.
I think their QC on injectors is not great.
I think all the sniper injectors are the same 100lb/hr, (which is bigger then any OEM gasoline injector) and have a LS3/LS9/LSA-architecture.

What I came with for a quick test. LSA injector, 60lb/hr. Should drop-in.
Will have 160lb/hr vs 200lb/hr total injector but that should be plenty for a F145, going to try it and see how it goes. Thr injector data in the tune will be off but closed loop should compensate enough. Will know in the next day or so.

Bosch 62659 available pretty quickly thru Rock Auto or Amazon for about $60

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Matt, just adding to the thread. I was having issues with the clips initially, after zip tying them I thought I was GTG but then a day later the truck fell flat on its face with a high duty cycle and stuttering. I tried your suggestion and the aside from swapping around O-rings these injectors work. A little snug going in but fine. I took it for a spin and noticed high duty cycle, after some research this is normal. I still need to see if these are big enough as the truck was a little sluggish but expected with a recent Wizard run and smaller injectors. At least it gets from point A to B without stumbling.

 

[cruisermatt]

Matt, just adding to the thread. I was having issues with the clips initially, after zip tying them I thought I was GTG but then a day later the truck fell flat on its face with a high duty cycle and stuttering. I tried your suggestion and the aside from swapping around O-rings these injectors work. A little snug going in but fine. I took it for a spin and noticed high duty cycle, after some research this is normal. I still need to see if these are big enough as the truck was a little sluggish but expected with a recent Wizard run and smaller injectors. At least it gets from point A to B without stumbling.

Correct, a smaller (flow rate) injector will recquire a higher duty cycle to supply the same amount of fuel as a bigger injector. The duty cycle is just a measure of how many times the injector is activated during a time period.
Did you change the injector data in your global file? That will help tremendously.

 

[JKIII FJ40]

Correct, a smaller (flow rate) injector will recquire a higher duty cycle to supply the same amount of fuel as a bigger injector. The duty cycle is just a measure of how many times the injector is activated during a time period.
Did you change the injector data in your global file? That will help tremendously.

Thanks for replying so quickly, I changed the injector flow from 100lb to 52lb (specs I found online). My fuel pressure is now 61-62 psi post injector install (stock fuel regulator). Did I miss anything else? I still need to run it for a bit and then play with the tables. The big difference now is a smoother idle, and less rich too.

 

[cruisermatt]

Make sure you confirm your fuel pressure in the tune as well if you didn't already.

 

[JKIII FJ40]

Make sure you confirm your fuel pressure in the tune as well if you didn't already.

Yep, still set at 60