I am having an eratic boost condition. The car will boost fine in some situations, but then it will only boost to .2 bar, and then you will hear a strange peeewww sound and then it will sometimes boost normal again, but not always. I had the same problem before I replaced the turbos. I have got an Apexi AVC-R and '99 spec turbos.

I am also experiencing an irregular idle. It sometimes idles at 1800 rpm, 800 rpm, and everywhere in between. It will also hunt at times as well. I have checked all my vacuum lines and they seem to be fine.

Any help would be appreciated. I want to have it in good operating condition for the new buyer.

 

have you checked the intercooler hoses and clamps? check before/after the y-pipe and at the intercooler. that might explain the sound.

no idea on the idle though. list your mods.

 

The sound comes after you let off the gas.

 

The idle problem could be you TPS

 

I just found my idle problem and it was the ISC was sticking and doing weird ****. Idle would bounce and the car was hard to keep running when it was cold. I unplugged the ISC onthe back of the UIM and evreything is good!Just something to check.

 

What is an ISC?

 

maybe he means ICS (idle control soleniod)