Re: 4.0 Flexplate orientation for install
Ok, here is the ending of the saga for any who care....
Had a problem after rebuilding my 4.0, would start but not run above idle, spit and sputter. Went thru everything..
Timing chain checked, marks are exact and 15 pins apart when checked by the book.
Distributer timing was exact, and btw it the book does a pretty good job, just make sure that the crank is at 0 TDC and that when you stab the dist into the cam that the oil gear in the bottom is lined up just right so that it will drop in with no effort, once in the rotor should be just past the #1 contact in the cap, as in trailing edge of the rotor just passing the cap contact.
FYI - as stated earlier (and I didn't have to pull anything to check this) and found in other publications, the flywheel or flexplate will only mount in one position due to staggered bolts holes (thanks JEEP).
Now the solution to my problem.....
Finally checked out all sensors and found none bad. Decided, after much frustration, to check the Crankshaft Position Sensor and see if moving it made any difference.... BANG! Problem found. Seems there is slight movement of the sensor for adjustment, moving it closer to the flexplate made the new motor run like a top. Seems that the distance was causing the missing at higher RPM. Such a simple cure for a perplexing problem. I figure during the install of the motor the CPS must have been hit or changed. An easy oversite that caused me a week of frustration.
Moral is, for most timing, missing, dieing problems... CHECK THE CPS!!!!!!
Thanks to those who helped with replies.
Now for the lift, new paint, and move some thing from the old 2wd 88 Cherokee to the 89 4wd....