2007 C230 Misfire
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Joined: Feb 2021
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From: Central OH
2007 C230
2007 C230 Misfire
Recently I was doing a bit of preventative maintenance on my 2007 C230 Sport (2.5L V6). I changed the spark plugs about 2-3 weeks ago, and my car started misfiring a few days ago. It was so bad I couldn't drive home, I called AAA and they towed my car to a local shop I trust. I received a call from them saying that the spark plugs were installed correctly, but I had 4 cylinders misfiring. They wanted to charge me $1200 to replace the coils (which is what they suspected the issue would be), so I had the vehicle towed back to my house where today I replaced the coils on my own. The misfire was just as bad as it was before with the new coils in. I ended up taking them out and putting the old ones back in so I could return the new ones. I did have a CEL for the PCM, which is the only other thing I can think it may be. The car is undriveable. Thoughts?
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Joined: Sep 2018
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From: unbegrenzt
2017 GLE350 4MATIC
Pull off the following connectors and use a bright light to inspect for presence of oil:
- cam position sensors (4)
- cam magnets (4)
- ECU (1 or 2)
- O2 sensors (2 or 4)
So 11-14 connectors in total. Any oil on the connector pins could lead to misfire. Search this site for “oil in harness”.
- cam position sensors (4)
- cam magnets (4)
- ECU (1 or 2)
- O2 sensors (2 or 4)
So 11-14 connectors in total. Any oil on the connector pins could lead to misfire. Search this site for “oil in harness”.
