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I have a 2004 Cayenne S which has a number of problems when startingon cold. All the garages I take it to just plug in the computer and say it is reporting no faults, so therefore there is no problem !!

The problems are:
1) sometimes it just will not start. I turn the key and the engine turns but it will not fire. It takes about 5 - 10 attempts to start it, and when it does, massive amounts of smoke come out and it smells of petrol
2) there is a problem with the cold idle speed. It starts at 1000rpm and then settles at 600rpm. however sometimes it wil drop and bounce between 200rpm and 400rpm. This causes it to stall in slow moving traffic...but it is an auto !!
3) the engine runs very lumpy when it is cold - almost like a misfire. I have had the coil packs replaced which seems to fix it for a short while, but then it starts again.
When the engine is warm, it runs very smoothly and is just fine. It is just the first 10 mins or so that are a problem.
Any help appreciated !
Steve
 

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The garages are right. There is no problem with your Cayenne. I have the same symptoms on all my cars.

For the first thing you listed that is mainly due to condensation building inside your gas tank. The more gas in there the less condensation builds up. So keeping your gas near full when you go home will help prevent that. As for the idle theres nothing to prevent that really. Other than running car for 10-15 minutes before actually driving it.

Hope this helps you out.
 

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If your coils have been replaced make sure the rest of the ignition system is in good shape ie spark plugs, wires, fuel filter. If tuneup stuff is in good shape I'd be looking for a vacuum leak on intake side that would cause the rough running your experiencing.
 

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Do you have your car sitting for long periods of time or drive it normally? parking it up for a while could result in a condensation build up (white smoke)
 
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