Just did a PCV service on my kids 1999 S70. No change , still running rough. pulled the following codes :


PO305- Cylinder 5 misfire
PO014- Exhaust camshaft position timing Bank 1
PO238- Turbo boost sensor A circuit high
PO353- Ignition coil malfunction


Could fouled plugs be the cause of 305 and which of the others would contribute the most to it running so rough ?


thanks in advance.

 

The easiest way to deal with the P0305 is to swap the coil pack with another cylinder. The P0353 suggests it will be the coil pack. If it's the coil pack, the P code will change to the new cylinder. If it doesn't change cylinders, pull the #5 plug and do a compression test. If you get poor compression, you likely have a burnt valve or leaking head gasket. You could look at the plug but its likely ofuled from the misfire.