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Porsche Specialist Surrey, Porsche Specialist London, Porsche Specialist East Sussex, Porsche Specialist West Sussex, Porsche Specialist South

Mystery misfiring at cold start

Check the air flow meter readings with PIWIS. The service manual gives you a load of parameters to check - ambient temp, speed, injector pulse width, ignition timing etc.

I had a funny cold misfire/stutter with my 986 and it was the AFM - car went stonkingly well when it was swapped out.

Used to get Lambda sensor/adaption codes on it after a longish run, but didn't get a CEL.
 
Thanks for that, another great suggestion to look into, just what I wanted.
 
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