ant-live said:
I'm running into all kinds of problems...engine revving on its own, cutting off while sitting, rough idle, hesistating, loss off of power. it does these things on and off. I tried to run codes and got nothing. I even took it to the dealership and they got no codes or vaccum leaks. What could it be? and how do you know when injectors are going bad?
i had same problem back in the spring..never found out what it was, i sold the car...i wonder if the new owner figured it out...anyway...engine revving when, at idle? or at steady throttle, say when your driving around? that could be the IAB sensor/valve, which is it i dont remember, but have you cleaned that?
cutting off while siting, loss of power, rough idle, could that be the crank and cam sensors? have you recently done a new water pump cause the old one failed? or have you ever replaced those sensors at all? how many miles on car, etc...
and can you run the codes for yourself? theres a good procedure on shotimes.com, then run the cyl. balance test...it cuts the injectors off, one at a time, to detect an expected drop in rpm...no drop, it says cyl is weak...mostly people would think that you would have worse compression in that cyl. but it could be that the injector is not performing, or the spark plug / wire / all that is bad/ or that the injector is not getting its pulse from the computer...so try and do the cyl balance test, if any come up weak, first test for spark in that cyl, then test compression in that cyl and at least 2 of the others, i can understand skipping the back bank if you dont want to rip the intake off to check compression...i guess ideally you should check all 6...as long as theyre within 10% of each other...after that, its gotta be your injectors...or the computer not sending the injector a pulse...i thought it was extremely rare for injectors to go bad...i had a car with 239 k miles, sent my original injectors to be flow & bench tested and cleaned, all that fun stuff, turns out they were all working wonderfully before the cleaning, i didn't need to get that done..and they were the stock ones, all 239k miles on them...hmm don't know
bottom line, we need more info? can you run the codes for yourself, and what kind of stuff have you done to the car recently...any little things youve noticed but not really cared about, i dunno...just, more info!
