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Cel From P1319/p1313


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Dear Renntech,

My C2MY99 one rainy day last weekend was sounding and feeling a vibration on idle, which a few minutes later resulted in CEL. I diagnosed the problem with Durametric to cylinder 1 misfire (P0300/P0301) with in addition P1319/P1313. The coils look good, and the plugs where changed 20k miles ago. I opted for cleaning the contacts to the coil (#1) and the sound and vibration on idle was basically gone. The car behaved well for few days and 100 miles of city/highway driving. Today a slight vibration on idle was detectable again. Sure enough, after 10min of city-driving the CEL came back on again and Durametric displayed P1319/P1313. I can't find any direct suggestions of what to do here in the forums other than it could be the O2 sensor or the camshaft calibration. I had one replaced (air cleaner location, I think) about 6 years ago. ANy suggestions where to start looking? My Durametric (5.1.4.0) did not display any values for the camshaft, but only some colored lines for some reason.

Thanks a bunch for any help with the issue that might prevent me needing to seek Porsche Service...

Hans

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Check ignition coil(s) again. Cracks are hard to see sometimes.

Resistance between terminal 1 and terminal 15 at 20°C it should be 0.3 - 0.7 ohms.

If the coils are fine then inspect the plugs and the connectors on the coils for damage or corrosion.

Remember you can always swap a part to the next cylinder to see if the fault follows the part (spark and coil pack).

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Dear Loren,

I did as told today and replaced the ignition coil in Cyl #1. Upon initial testing, the car now behaves good without any RPM fluctuations on idle. There is no apparent damages to the old coil but I will measure to see if something is awry. I'll know if the replaced coil solved the issue when I get driving the car a bit the coming weekend.

THANKS,

Hans

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