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Rough warm idle
Howdy,
I have a problem with my car that has me stumped. It's a 2001 986S, 105K on chassis, 35K on engine.
At warm idle, the car feels very rough. I can feel the engine shaking through the seat back. Idle fluctuation at warm idle is from 740-790 rpm, measured through the OBD2. At cold idle it is approx. 800-810, noticeably steadier.
No fault codes, no other driveability problems. No smoke.
I removed the TB and intake manifold to clean it. TB was clean, intake tubes and manifold had small oil puddles. I removed the y-pipe between the intake tube and the AOS, and plugged the intake tube opening. The idle did not improve, but there was a lot of smoke coming out of the AOS opening. Is that normal? I assumed that at idle blowby would be minimal?
Does anybody have an idea what's going on here, or what else I could check?
Thanks!!
Gary
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