Ok, so here is the deal. I have twin fuel pumps runnin on E85. After drivin for 10-20 min my car will start to lean out. I thought it was just a my primary fuel pump going out, so I just swapped them inside the tank and it still leaned out after drivin. Next i checked in inline fuel filter and it was good. No dirt or anything came out of the filter. I don't really think it could be an injector problem..... So what else could it be? I'm pulling the CEL's tomorrow. I usually have 2-3 on the car that always come back but never effect driveability.. All mods are in sig... I don't think its a boost leak bc it doesn't do it constantly or at all until its been driven for a while.

If I were to make my best motor sound it would be some where in this area: Vrrrrrmmmmmmmmmmmm(normal)bluhvvrrrrrrrrrmmmmmmmmm mmbluh bluhvrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmm mmm bluh bluh bluh until finally the bluh all equal very lean AFR and I pull over and shut the car off for a while. After 5 min of sitting I can drive the car normally for a couple of miles until it repeats the process. I had to limp it home like this. Hope the sound effects helped.

I think it has to be something mechanical bc i'm able to shut the car off and sit and then it will run for a while longer. I thought it was the pump getting hot..... Now I'm stuck.

 

im sorry i ant help with the problem but i HAD to complment you on your written sound effects!!!! haha goodluck

 

well if your car sounds like that, it's probably a problem with fuel pressure...got a gauge you could check it with?

however, if it was going.... Vrrrrrmmmmmmmmmmmm(normal)pssssssshhhhhhhhhhhhhhhh hhh(rfl bov)bluuuuuuuuughhhhhhggghhh(not normal)pooooooooooooooooooooooo(i dont know)
then you'd have a big problem on your hands

but yea check your pressure...maybe switch back to a 93 octane map and see if it still leans?

good luck

 

I do have a fuel pressure gauge. I'll check that but I'm almost certain its a fuel issue, but I don't know where to look. I'll throw the gauge on this weekend.

 

It sure sounds like some kind of fuel issue to me as well.

 

you find out what it may have been? Have seen that problem before, how the re map go for you? Your in OK, you dont have 93 do you?

 

I gave up on the problem after I could not figure it out. I took it to my mechanic and he bypassed the fuel pressure silenoid (I think) and wah lah. 5 min fix. Zip tied the vacuum hose and all is good to go.