Help!!!, I've checked "everything" when it's cold you start it and rpm's start going up and down between 1100's and 500's and after 10 sec's it shuts off!!!!!! but if i don't let it turn off and i accelerate it until get warm, it stays on but with 1500's rpm and 1700's rpm, i changed the EGR valve, with an used one, i changed the TPS sensor too, the MAP too, i cleaned the spark plugs, i got 40 psi on the fuel pressure gauge, so the fuel pump it's good, and a little detail, if i unplug the IAC valve it doesn't make a difference, i'm going up to check the O2 sensors next friday, i was basing myself on the Haynes book, and it makes reference to this kind a problem, with the vaccum hoses and the air intake to everywhere, hoses are right, & and i haven't messed with wiring yet, i.m letting it as a last option,
also does anyone knows something about the check valve that it's under the car, the one is connected to the fuel tank, this one it was leaking fuel from there since i bought it. i just cut it and i reinserted the hose into the fuel tank, but i would like to have my car working how it has to work!
thanx!
Optispark is on the 5.7. You said you have 40 psi fuel pressure. Try pinching off the fuel return line and see what the fuel pressure goes up to? Only pinch it for about 5 or 6 seconds.
It could be your optispark wire harness. i had the same problem with my 95 camaro. but i changed my distributer and the wire. it takes a like 30 sec to set its self.
It sounds like you might have a bad mass air flow sensor .
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it's a 3.4 (V6) as it says in the little comment, and i think if you have a MAP sensor u don't got a MAF sensor, i replaced mine with a used one should i get a new one? cuz personally i've seen the used one it's working cuz if you unplug it the car shuts off!!!, and what about the optispark wire harness is it the power source for the electronic coils module? the one that gives the firing order? or "am i pising out the hole?"
i'll check it but u really think it's the fuel pump? cuz it seems something else or different, being cold the car starts accelerating and decelerating itself but without crossing the 1100's rpms!!!, i'm not doubting about your capabilities bro, but i won't like to buy another fuel pump cuz i bought it like 4 or 5 years ago brand new, 300 bucks men!!!
Which engine?
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