4.0L engine mis-firing badly when clutch isdepressed
I just finished putting in a new clutch on my '92 Jeep wrangler YJ. It's a 4.0L with a 5 speed manual tranny. Ran it around the block the first time and all was good. Ran it around the block a second time and it started misfiring badly. Stopped, took it out of gear and released the clutch pedal and the mis-firing stopped and the idle smoothed out. Pushed the clutch pedal back in and it started mis-firing badly. Also, installed (prior) new plugs, wires, dist. cap and rotor. Idles great! revving it up w/o clutch disengaged sounds great. With clutch pedal in hard to keep running/mis-firing.
somehow i would assume you have changed the crankshaft sensor gap or left it loose thats the only thing that comes to mind. make sure you got the crankshaft sensor tight and its installed all the way against the flywheel tone ring. it bolts to the block but passes thru the trans bell housing.
I had a transmission basically fall off and was only held on by one loose bolt. Took it wheeling right after I bought it...but I guess the p/o didn't know how to properly torque a bolt.
Every time I touched the clutch, it would start misfiring. The trans was being pushed away from the flywheel, messing up Signal from the CPS.
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