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misfire - not coil

K

kelticcare

New member
Hi looking for a bit of advice please.
I have a misfire on cylider 4 on idle, never affects any other cylinder. Do not notice it once driving. Checked by local mechanic and his diagnostic computer just tells him misfire on 4, engine warm - or something like that. Engine Management Light does not come on. Recent service when all plugs/coils changed, and just replaced coil #4 again but made no difference. Can anyone make suggestion. I have an extended dealer AA aftercare waranty, but they will not pay for diagnosis so everything i try will cost me until fault found.
Live in North Scotland so nearest Porsche dealer 2 hour drive away in Aberdeen.
Thanks in advance
John

2003 Porsche Cayenne Turbo
 
The misfire and coil packs are what spring to mind, but clearly you've tried this. Maybe the two hour drive and a hook up to the OPC diagnostic equipment is the only way you'll find out for sure. Others more technical may have an answer.
 
I also have a Cayenne Turbo (2004) but with a slight misfire on cylinder 3.

Plugs were changed along with coil packs about a year ago (9000 miles),

OPC west London have had the car for a week recently, and still cant find the problem, they checked Plugs, Coil packs, Maf sensor, etc, but it still comes up with a irregularity on cylinder 3, and the car still has a rough idle.

I will be taking it back to them in a few weeks for some more investigating, and will post on here if they find a cure.

All the best.

Tony.
 
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