- Mar 13, 2013
- 9
My 03 envoy started a misfire the other day. I ran an obd scan on it and it said that cylinder 3 was misfiring. I bought a new ignition coil and was taking the other one out and i noticed there is oil in the spark plug well. Enough that it iw almost definitely the cause of the misfire. When I pulled the old ignition coil out, oil was dripping off the end of it. Is this caused by a bad head gasket? Any help would be much appreciated