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2004 Turbo S about 100K miles

I got this email from my brother-in-law today and thought I would toss it the way of the experts to consider.

I know he's had "some" coil packs replaced and I believe they are common failures on the Cayenne. I'm going to go over there tonight with a cheap OBD2 just to see if there is a code related to a cylinder but I'm telling him my guess right now is a bad coil pack is not firing, gas is getting dumped into exhaust and the cat is giving off the sulfer dioxide smell.

Any thing else common to the following issue? I've been helping him maintain this the last two years as the economy has not allowed him to go to his dealer or speciality shop unless it's a big issue....

I got into my Cayenne this afternoon and as soon as I turned the ignition on the car started to sputter at idle. Once I pulled out of the garage and hit the accelerator I notice very little power and the car begin to shake. At this point, not warning indicator had been displayed but the car wasn't driving right. I only had to go two miles down the road to the gym and when I got out there was a noticeable smell. It smelled almost like rotten eggs or just bad exhaust and didn't seem to be coming from the engine but rather the exhaust system.

When I got back in to drive home the Emission Control Warning Light appeared after a few hundred yards and continuously stayed on for the remaining two mile drive. When I got back into the garage, I noticed the same smell as before. The manual notes that the "light indicates operating states which might cause damage to certain parts of the emission control system.

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I agree that it's a misfire related fault. I would replace all of the coils and spark plugs at the same time. Check with your OPC as I thought there was a recall issued for the V8 coils.

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