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Gary Gaukler · 05-16-2010, 03:37 PM

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

05-16-2010, 03:37 PM	#1
Gary Gaukler Registered User Join Date: Feb 2006 Location: College Station, TX Posts: 54	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