Ok my question is this ,, engien light comes one but for only a few seconds then goes back off,.,. so i decided to check it and read what code she was spitting out turns out to be code 35 from the book it says I.A,C ,. so what ide like to know is can this i.a.c once replaced improve my fuel economy?
and if the light only comes on for a few seconds and turn's back off, does that mean its not compleatly broken or wha?? some one fill me in please?? what improvments will i notice,..,auto zone want$45.00 for a new one???? thanks in advace for all your ppl's help

 

unscrew the iac and give it a cleaning, if that doesn't help just grab a new one

 

ok so if i clean it and if is workin properly i will not get that same code right?
also if this part was realy bad what would i notice as fas as ideling or daily driving??like idel fluctuation ? engin rev high then low or???/.....

 

What does the car idle at right now?

does the light only come on when you start the car, then go off after it's been running a few seconds or does it come on after the car has been runnign for a little while?

 

it comes on once i have been driving for a while but only for a few moment then turns back off.,., i del around 900 to 1100 rpm but i notice when i rev it up to i dunno say 3k rpm it revs up and down up and down.. but is not noticable while driving in gear

 

OK, that makes sense. The code actauly means that the ECM cannot achieve the desired idle RPM. The very first thing you should do is check of vacuum leaks. This is easy to do, just get a can of Brakleen or something similar (carb cleaner will do) and spray it around the intake and all the hoses. if the idle goes up or smooths out, there's a leak where you just sprayed.

also make sure that your minimum idle speed is set right. if you have the sto pscrew out too far, then the Throttle plate won't close fully and raise the idle and even with the IAC fully closed, the computer can't compensate.

My money is on the vacuum leak though because you described a little idle hunting.

Good luck with that
Jeff

if you don't find any leaks, then the motor itself is probably bad and need to be cleaned, and in the worst case, replaced.

 

OK THAKS FOR THE ADVICE I WILL CHECK FOR VAC LEAK SO IF THIIS IS THE CASE THEN MY I.A.C COULD REALY IN TURN BE OK?
ILL EVEN MESS WITH THE STOP SCREW., THIS WOULD BE THE "MINAMAL IDEL SPEED RIGHT????

 

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