I bought a 2002 Jetta turbo a few months back, and one of the coil over plug packs went south (P303). My mechanic checked out the crank sensor among other things, and said one of the new iridium plugs was fouled. So he replaced all four at $10 a piece. I also bought four new coil overs, replaced the originals, and the car ran fine for a month. Yesterday one cylinder was misfiring, so I swapped them around and the car ran fine again. ODB displayed a P301. So without replacing any coil overs, the car ran fine for 24 hours and now we're back to a misfire.I don't have an ODB and I've been going to Advance to get the codes. I suspect it's another coil over.
What in the world is causing this intermittant misfiring?
Friday, June 1st, 2012 AT 8:25 PM