The part that is known to fail in these engines that causes no spark is the Crankshaft position sensor, it is located on th right side of the bell housing as u stand in front of truck, it must be changed from below the truck and is very difficult to get at, here is a photo of the sensor and a brief description of the repair
this is from another site.
the aspect of this photo is top u are looking from the trans towards the engine block, bottom same view different angle.
A. This was a widespread problem for Chrysler and they issued a couple of TSBs to address the problem. The first was:
Models:
1989 MJ & XJ Bodies ( Grand c. and CJ jeeps)
Subject:
4.0L No-Start, Hard Restart, or Engine Die-Out. Vehicles Equipped With Automatic Transmission Only.
Index:
DRIVEABILITY
Date: December 29, 1989 No.: 18-57-89 (C18-23-9) P-14
Body Code Legend:
MJ - COMANCHE (RWD, 4WD) XJ - CHEROKEE/WAGONEER (RWD, 4WD)
SYMPTOM/CONDITION:
Some 1989 vehicles equipped with the 4.0L engine and automatic transmission may experience an engine no-start, hard restart, or an engine die-out. This condition may be caused by low signal strength from the crank position sensor due to a larger than desired distance to the flywheel sensing ring.
I craped my pants trying to change mine
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