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Eratic boost/idle

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Old 09-16-03, 10:32 AM
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Eratic boost/idle

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.
Old 09-16-03, 01:35 PM
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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.
Old 09-16-03, 03:10 PM
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The sound comes after you let off the gas.
Old 09-16-03, 07:39 PM
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The idle problem could be you TPS
Old 09-16-03, 08:26 PM
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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.
Old 09-23-03, 02:37 PM
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What is an ISC?
Old 09-23-03, 05:22 PM
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maybe he means ICS (idle control soleniod)
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