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V8 958 cayenne running rough at idle

Robert Temple
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Robert Temple PCGB Member
2023/09/12 15:53:49 (permalink)

V8 958 cayenne running rough at idle

I've a 95K mileage V8 cayenne and it has an intermittent rough idling especially when hot. Once I set off the engine runs fine with no misfires, its just when at idle at junctions.
Anyone experienced the same? Any thoughts on an independent specialist in the Chester/Cheshire are?

2 Replies

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swiftus PCGB Member
Re: V8 958 cayenne running rough at idle 2023/09/12 16:10:00 (permalink)
Sounds like a coil pack is on the way out? 

Have: 996 Turbo.
Had: 996 C4S, Cayenne S, 993 C2, Carrera 3.2, 952, 944, 924, 924 Racer, 924
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greg_harm PCGB Member
Re: V8 958 cayenne running rough at idle 2023/09/12 17:17:05 (permalink)
It’s definitely worth getting it checked sooner rather than later, my early Cayenne S has just dropped several valve seats through getting excessively hot after a coolant pipe burst, so make sure you don’t make the same costly mistake by leaving it to long or by trying to save an extra couple of quid.
A bad coil pack is definitely a good shout and probably the easiest place to start and shouldn’t be overly difficult to find by a good tech. That said, I had a misfire on my 996 when it warmed up which turned out to be a lifter issue, so fingers crossed yours is a much easier fix and that you manage to get it sorted quickly.

Cayenne Register Secretary
2022 Cayenne E Hybrid
2022 718 Spyder
2005 Cayenne S
2002 911 996 Cab
2001 911 996 C2
1991 944 Turbo Cabriolet Alpine White
1984 924 white 1980 911 SC 3.0 White.
1999 Boxster 2.5
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