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Old 07-30-2014, 11:01 AM   #1
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Join Date: Jul 2014
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High Idle, slow to return to idle

Just picked up a used 97 saab900 turbo (B204), so bear with me as I am learning its tendencies. Just did some serious head work as it had a blown HG and was burning coolant and mixing it into the oil. All that seems solved and compression/leakdown is good now.

Starts right up, idles smooth and steady at 1000rpms per the dash tach (is that normal or a tad high?). Dont feel any misses or anything. Revs up great. Never wants to stall or idle low. No CEL and Codes.

Problem is, once you rev it up, it doesnt come right back to idle speed. Tends to hang up around 1400-1800rpms for a few seconds before coming back to idle. Also, once yesterday it started to surge and hunt between 1200-1500 before returning to steady idle.

I just replaced all the vacuum hoses and lines and everything seems correct there, Vacuum tested the turbo bypass balve (in intake tube) and it holds vac. Spray tested around the TB and Intake manifold for an air leak and couldnt find anything sucking big time air. Does this sound like the IAC or are there any other quick and dirty test to help find a vac or air leak somewhere else?

TIA
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