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911fiddler
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Hi logray. Am staggered to have found someone chasing the same issue that I have been for the last 3 years, on my 1998 996. I have done very similar tests hwever you've done a more than me. It would be great to know whether you have fixed the issue now? Some things I have done which may be useful to you.... -measured crankcase vacuum as water-inches to check AOS, did you do this? -lapped the mounting face of the idle control valve as I discovered 1mm off flatness with the 0.5mmm gasket. -checked the inlet manifold resonance flap bearing for vacuum leaks. Some things I have spotted which I need explanations for... -at idle the ignition advance is unstable between 3 and 9 degrees. -if I tamper with the airflow meter wiring, just move it around slightly, thereafter, for a while the engine idles more smoothly, runs better. Same as you though, a DME reset from power disconnect also makes the engine run nicely for a short while. Pete. Peter.shephard@o2.co.uk