2002 porsche boxster misfire: I had a problem with dirver side catalytic converter. Boxster Raodster. Changed both sensors with universal bosch, driver side. Still problem. Car started misfiring random. Changed catalytic convertor, misfire stopped for about 1 week. Misfire started again only at start up. Fuel Filter not changed yet. Air Filter not chnaged yet. All else changed. What could be the cause?
Catalytic converters and oxygen sensors won't cause a misfire in your situation. What cyls are misfiring and how did you determine random misfire?
December, 26, 2010 AT 4:19 AM
Cylinders 2, 4, and 6 by OBDII readings. I replaced my O2 Sensors first, which I wish I had not done. Then I replaced my catalytic convertor because the filter material had melted from the misfires. However; after much research on AllData and other Tech bulletins, I figured out that the one thing, which causes these symptoms in the Porsche Boxters and other models is the Air-Oil Separator. I changed it at about $106 from AutopartsWerehouse and put it in myself. It took me about 15 minutes. Problem solved. Thanks. Now I'm struggling with the Jaguar X Type Transmission Problem, for which the dealer told me I would need a new transmission. All it takes is resetting the J - Gate. It's a huge differenc ebetween my own free labor and about $10,000 for the Jaguar dealer for a new transmission. As an engineer, I just don't think that's ethical on their part. : )