Join Date: Jun 2008
Location: Chesterfield, VA
OK, its update time!
Primed engine with verified oil pressure on guage for 30 sec. It hit high a few times and averaged around 40. Got to watch that drill speed.
Adjusted timing (several times), rad, PS installed.
Kept getting error code 24, 33 with a dieseling engine that was sparking and putting heat to the exhaust.
Changed TPS. Gave up around 10:00.
Waited a few minutes and regrouped, I took a meter and rechecked new TPS voltages, and then backfed the TPS while attached to ECU. Tested fine so both ECU and TPS are OK in this regard.
The TPS code is now gone today. I ran an ohm meter on the CPS and it was not in spec, and then tested Manifold Temp and coolant temp sensors. Wasn't spec, and changed them. Now in spec on latest readings. Still dieseling.
Codes showed 33 only now. 33 is AC clutch relay. I have no AC. Checked all fuses with meter and changed some PO errors thanks to FSM Wire Diagrams manual. Still same.
Checked ignition circuit. Checked continuity from inner fuse box to ECU with ign on and off and seemed to pass logic. Checked ECU harness connector pins 3,9,11 and 12 for 12V(3,9) and ground (11,12) - OK
ECU is not the correct part number for this jeep. PO had gotten it from junk yard due to case markings with yellow crayon. ECU connector nut was broken out of board by PO, leaving possible water entry to board.
That all I can do to assume it could well be Mr. ECU at this time, so I just ordered a reman unit. If that doesn't solve it who knows. Maybe I will pull the O2 sensor to allow vent to see if I am getting backpressure from CAT?
If that ECU is not bad after taking it apart and looking inside.....it will be soon. Also the part # is so far out of whack from 91-93 parts listings...it can't be helping