Will a Bad Iac cause your idle to jump back and fourth between
800 and 1500 rpms at idle?,could it affect shifting, loss of power, cause a miss? thanks

 

sounds like IAC. could alos be a vac leak but doubtfull..

 

but just having a bad iac cause all these problems ?

 

it could cause a rough idle.. but not an all out missfire

 

Mine caused about a 1800-2000rpm idle and sometimes it went down to normal, then back up to high.

 

Yes It should be throwing a code.5 somerthing try to get it scanned and find out what it is if it is idle fine then try to check your hoses goibng to tb..

 

but wii it affect shifting, loss of power, cause a miss

 

not usualy. you could ahve several problem or like I said a vac leak.. that will effect perfromance..



also a bad IAC will not always set a code. in fact you rarely see them

 

Have you tried cleaning your IAC? My idle jumped all over, especially when coming up to a stop. I cleaned it and all is well.

Aaron

 

yea i cleaned it, i tryed checking for vacuum leaks with starting fluid kinda hard to tell if there is one because the engine revs every 30 seconds, I'm going to go ahead and replace the Iac
got one ordered , i still dont think that is all my problem , will one problem create another problem?

 

did a new iacc fix the problem? mine is doing the exact same thing and it is driving me crazy

 

hmmm.....I would think it is either a vacuum leak, bad iac, or the mystery idle surge that no one really can figure out.

If it is the first one, the car will only do it when it warms up.

If it is a bad iac it will be more constant, as in cold or warm.

If it is the last one, hold on My car has it, and so do a few other people on the board. Once you figure it out, call me back

I am praying that yours is the iac.

 

mine does it when warm or cold does not matter, think i will try a new iac and see what happens.

 

hey do your cars run like crap also loss of power and missing? along with this rpm jump