misfire detector disabled

[srteach]

Could someone tell me what would cause a problem that would bring up a "misfire detector disabled" when I hook up my OBDII diagnostic computer?

What and where is the misfire detector? Is it part of the coil pack? Is it a sensor? or a plug problem? Any help (other than it detects misfires) is appreciated.

This is on a 1999 XLT Ranger 4.0L OHV engine, M5D Trans. Engine placed in the truck on 6-21-08 from the junk yard. Intake, exhaust and coil pack from original engine.

I just finished a 120 mile trip at interstate speeds, the CEL came on after 15 minutes of in town driving.

 

[Bob Ayers]

The camshaft position sensor is what the PCM uses to detect misfires. It is on top of a synchronizer shaft in the back of the engine, where you would expect a distributer to be.

 

[srteach]

Any Idea how to fix or repair it?

 

[Bob Ayers]

The sensor usually has to be replaced, or there is a connector/wiring problem to the camshaft position sensor.

 

[srteach]

The sensor you described is one thing that made it from the original engine to this replacement. Could it have been mistimed when I transferred it? or is it simply a hall effect sensor?

This problem would cause stumbling of the engine, wouldn't it?