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Engine Problem – Misfire Cylinder 4, 5 and 6 - 997.2 (2010

M

mjansari

New member
Hi,
I have a strange problem with my 997.2 (3.6 – 2010 model) . The car starts first time but the engine idle goes lumpy after a while on idle and at low speeds feels hesitant sometimes (noticeable). Ive scanned the car this morning using a PIWIS computer and is coming up wth a misfire on Cylinder 4, 5 and 6.

I am now scratching my head and am open to suggestions on what to do next. Could this be down to a bad O2 sensors?

Any help or advice would be much appreciated.
 
When I had the same thing about 2 months ago, it was the coil packs that were damaged from heat. Since it was 3 of them, I replaced them all and the spark plugs. Economy increased from 23mpg to 26. Yeah!!!!
 
I'd go coil packs. I had 4 and 6 misfiring on the 997. Took them out and the casings has disintegrated exposing the insides. Replaced all 6 and no more misfires!
 
On a 997.1 I had this just after a major service including plug change. Barely got it to the dealer with really bad misfiring on all cylinders.

valve lift solenoids changed, all fixed. Only £580 rather than a new engine.

Rich
 
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