Here is an excellent article by Steve Weiner at Rennsport Systems regarding carbon buildup issues. This includes valve guide wear and exhaut port problems.
Rennlist Discussion Forums - OBD-II CEL : Carbon buildup issues (long)
References:
Rennlist Discussion Forums - Cleaning SAI Ports…DIY Write Up
1 response so far ↓
1 Steve Reso // Jan 28, 2009 at 12:34 pm
I have a 98 993 with sport cams, cat bypass pipes and chip upgrade by FVD. I recently added a lightweight flywheel and it stalls constantly , even though my computer has supposedly been upgraded to compensate for the flywheel. I have read that the idle control valve can be tweaked, but cannot find out what the tweak is. Can anyone help me.
Steve
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