Re: Brake Booster & Idle Problem - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Brake Booster & Idle Problem
Posted by Dean (more from Dean) on Mon, 1 Dec 2003 09:34:52
In Reply to: Brake Booster & Idle Problem, Wilson C, Mon, 1 Dec 2003 09:01:25
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There is an air flow from the brake booster to the throttle body. This may affect the mixture for a moment. That is normal. The ECU and IAC then attempt to stablized the RPMs. If the idle over reacts, then perhaps there is a problem with the TB and IAC needing to be cleaned.
The idle speed will fluxuate slightly with changing electrical and air conditioning loads as well. There will be a bit of noise and vibration as the IAC increases air flow to deal with those loads. Thats normal.
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