I drive a 2001 Cobra Mustang each day. I've detected a slight intermittent miss. Then the check engine light came on but only for my drive home and not since. I took my car to the dealer and they said #5 was dead. I asked and was told the plug, wire, coil and was functioning right. They tried new ones. They suspect a burnt valve or piston, or worse, but won't know unless they take off the head or remove and disassemble the engine. Has anyone heard of a like issue? Do you think a leak down test would paint a clearer picture? Apparently that's a big job on this car. At a minimum I seek a second opinion but am not aware of a shop that might be right for that other then another dealer. I live in the north burbs of Chicago 85K miles. Well cared for. Merry Christmas to you all. (And please forgive my typo in the title for this) Brian
I'd definately have a leak down and a compression test done just to validate the service departments diagnosis. U.M.
I checked compression. 7 have around 200. #5 has 115. When I introduced oil that one went up to 150. Some times the car runs smooth. But at low RPM under a load you can tell something is not right. I think I have a big problem with my engine. Anyone know a shop in the north burbs that can help me? I might need to put in a rebuilt. Brian
