I think I paid about $400 for all six ignition coils to be replaced at the dealership. There was no additional labor charge because they were changing out the spark plugs anyway under the 4-year scheduled maintenance.

 

after one week i have again misfires in 3 cylinders (4,5,6).
i start the engine again and have no problem.
then after a ride i used durametric ,erase faults and log misfires in all cylinders and in "Ignition counter misfire detection"
in all six cylinders the result after a quick ride was 0 and in "Ignition counter misfire detection" was from 4 to 2990!what that means?
also mass air flow was 60 to 80 and a few times up to 180.is this normal?

any idea what is going on?
2000km ago i changed my sparks in porsche!

 

My 06 C4S is in the shop having it done now at the dealership in Evansville IN at the 36k mileage mark. Out the door in less than $900.00 for this fix.

 

If one fails I suggest changing all six. the others will go soon if you don't do it that way.

 

I'm in Cal and my car is a DD (rain and all except snow). At 60k miles, no visual cracks when I replaced my plugs.