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hi, my first post here,

got a 2004 CTT.

all 8 coils changed last week due to one failing and the car being new to me.

there is a very mild "pinking' type of rough idle weather the car is hot or cold.

reading other treads for the possible causes...where can i find

1) the EGR valve

2) idle control valve

3) i know that this is a biggy but where wold i start to check if there is a vacuum issue?

my plan was to remove and clean both the valves with brake disc cleaning fluid/isopropelene.

any other suggestions would be great.


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Do you have any fault codes? The Cayenne doesn't use a idle speed motor but an electronic throttle plate controlled via the DME, it wouldn't hurt to clean it. It's best to use a smoke machine to fault trace vacuum leaks.

Could you be more descriptive about the issue you are having? You shouldn't be having any pinking at idle but only under load.

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thanks for the reply..

under load/acceleration no issues after i changed all the ignition coils.

waiting at the lights i can just about feel the car miss a beat. and thats it.

being a new owner there might be just a bit of OCD.

but if the parts are easily cleaned i presume it wount hurt?

sorry what is DME cleang?


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