Using a coil on plug tester, Cyl #6 appears not to be firing and #4 randomly firing. I swapped #6 Coil and plug with #5 (the working cyl) and the problem stayed with cylinder #6.
I checked wiring continuity all the way back to the ECM. No opens. No shorts.
There is no check engine light. The front bank cat melted which also clogged the downstream cat. Replaced both and am now trying to deal with the underlying problem of the cylinder misfire.
Does this sound like an ECM problem? Why would the ECM single out one cylinder; and how does the ECM know when a coil is failing enough to throw an error code?
Could a failing camshaft or crankshaft position sensor affect a single cylinder?
Any ideas would be greatly appreciated.
have the same problem?
Wednesday, May 26th, 2010 AT 9:47 PM