Yesturday, I started my jeep TJ, and it was rough, I mean really rough. Like a bad spark plug or a cable. Anyway, I drove it to work. Going howe it was as before. Today, no problems. Any one want to venture on this? BTW, the check engine light came on and the codes are 12 43 43 11 55.
Dave Milne, Scotland
The keys are in the Code 43 and 11.
12 means the battery has been disconnected at some point in the life of your Jeep, and the odds are that this is actually true. The 55 means there are no more codes to report.
If the OP has the engine with a separate coil for each cylinder, my guess is that one of the coils is going out. Being the optomist that I am, the coil is the simplist part to have failed here, however, I thought the individual coils had individual Codes.
I know you guys like to cycle the ignition on and off to extract the codes, but I'm thinking this would be one of those times when the OBD II Code Reader would be useful.
Having said that, since Code 11 is the crank position sensor, which is the conductor for the entire orchestra, if it wasn't working right, it could cause a coil not to fire, and a Code 43 could be stored as a result. I'm gonna change my diagnosis to the Crank Sensor, or Cam Sensor, which I think are roughly equivelent parts that do the same job in different places.
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