We have a 2007 B9 Tribeca with now ~147k miles on it. Starting in last fall, we started having ignition problems. Using a code reader gave us the P030x Cylinder x Misfire codes where x was at first 3. After a series of visits to the dealer they diagnosed it as the ignition coil pack on cylinder 3 and replaced it. The old coil pack was very sooty in appearance so it seemed a viable diagnosis.
After that it ran smoothly for a time but the problem reoccurred so they did the same thing on cylinder five. It again ran smoothly for a time but about a month ago started having problems again and so this time I got 6 new coil packs form 1A Auto and replaced numbers 2 & 4. At this point the packs for all except 1 & 6 have been replaced either by the dealer or myself.
This time it only ran smoothly for about a day before it again had ignition problems and now the code reader is listing cylinder 2 & 3 misfires(P0302 &P0303). Both of those have had the coil packs replaced.
I have not pulled either of those new coil packs to see if they are bad but I am now wondering if there is an underlying cause to these errors that I am not seeing. Or should I just replace 1 & 6 and have all new coil packs and see if that fixes it?
Any help is appreciated.
After that it ran smoothly for a time but the problem reoccurred so they did the same thing on cylinder five. It again ran smoothly for a time but about a month ago started having problems again and so this time I got 6 new coil packs form 1A Auto and replaced numbers 2 & 4. At this point the packs for all except 1 & 6 have been replaced either by the dealer or myself.
This time it only ran smoothly for about a day before it again had ignition problems and now the code reader is listing cylinder 2 & 3 misfires(P0302 &P0303). Both of those have had the coil packs replaced.
I have not pulled either of those new coil packs to see if they are bad but I am now wondering if there is an underlying cause to these errors that I am not seeing. Or should I just replace 1 & 6 and have all new coil packs and see if that fixes it?
Any help is appreciated.