Mass air flow sensor suspected ?

[cayenne69]

Hello,

I have a 2004 V6 Cayenne and the dealer changed both catalytic converter (at 40,000 miles) because they were jammed (I was reaching max 50mph with the car), 10 spark plugs in less than 10,000 miles (6 new and 4 after 10,000 miles with residue on them), 10 coils (6 new and 4 cracked or damaged). They got code for misfire and the car have a rough idle when cold and humid. When engine is hot, everything is perfect. I also noticed black residue around the exhaust tip. So based on the information below I sprayed cleaner on MAF and nothing have changed. Do you think the MAS is defect or any of you experienced something like this ??? Thank you very much for your help.

[Loren]

The need to look at the mass air flow with a tester and see if it is changing and within spec (to see if the MAF is working properly).

[wvicary]

If you've had multiple misfires it's recommended to change the engine oil/filter due to fuel contamination.