Goofy Idle

[.SHOoff.]

What would make my idle flucuate up and down from 1200-400-1200-400-1200-400, you get the point?

Its a 90.

 

[PROPHET]

Could be a vaccum leak or dirty MAF sensor.

 

[Rob94]

As Prophet said, it could be a vacuum leak. It could also be a gummed up AIB valve. While I doubt there'll be anything there, try running your codes.

 

[shojuan]

A fuel pump on the fritz

 

[F-22 Raptor SHO]

My 90 did the same thing....clean out that 'IAB' valve (Idle Air Bypass) on top of the motor

 

[.SHOoff.]

Thanks guys, I scaned for codes but turned up nothing. I'll just replace the IAB valve and cross my fingers

HAPPY NEW YEAR!!!

 

[HighSpeed]

It could be the IAB, TPS or A/C compressor, these are my guesses.

 

[F-22 Raptor SHO]

Thanks guys, I scaned for codes but turned up nothing. I'll just replace the IAB valve and cross my fingers

HAPPY NEW YEAR!!!

Unless you just happened to have an extra IAB valve, you will find that the part is like 75 bucks...I would try to clean the one you have out with berrymans first to see what it does to your idle.

A TPS is 19.99 at AZ and is pretty easy to change...I happened to have replaced that recently but that was not because of the jumpy idle.

 

[wingtip80]

Just cleaned my IAB valve this morning. my 90 would fluctuate from 1,000 al the way to 3 or 4,000. Idles good now.

 

[NotSoSlowSHO]

A fuel pump on the fritz

Mines doing that right now In addition to the random hard starts.

Im replacing it tomorrow... :corn:

 

[.SHOoff.]

Unless you just happened to have an extra IAB valve, you will find that the part is like 75 bucks...I would try to clean the one you have out with berrymans first to see what it does to your idle.

The one thats on the car is probably original with 99K, I'd rather replace it. If it doesn't do the trick, at least I'll have a new one.