It is a Sl2 about 100k on the engine. Last night I was driving and I developed an engine miss. Today I changed the spark plugs- no help. I isolated the problem to mostly the #4 cylinder. I thought maybe the coil was bad, so I switched them around-no help. I checked the #4 plug wire-no help.I changed the ingnition module- no help. I switched the #3 and #4 injector leads- no help. I listened closer to try to find the problem, I came to the descision maybe the injector was getting hung up. I switched the 3 and 4 injectors and the miss is still in the 4th cylinder. The fuel rail does not seem to be clogged. I do not know where to go from here, I have done all I know to do, and need help. The car runs ok once in a while, then back to crap. There is no kind of pattern whatsoever. what else can I do?
Apr 28, 2008 at 3:11 PM