Hello all,
I bought this FI 4.0 / CJ7 from a neighbor whose husband had died. It's a rusty mess from sitting outside unmoved for over 10 years so it's a project. Story goes that they had this 4.0 with 5 speed installed with the original Dana 300 and never could get it to run.
I have the tub off to work the rust issues so the cobbled-up wiring project is uncovered so I can see everything. The engine block says it's a 95. The PCM has 97 Cherokee written in that yellow marking that wrecking yards used so I initially thought I was dealing with a 97.
I bought a 97 Cherokee manual and quickly saw things were not quite adding up. I've pulled the plugs which were all OK, checked compression which was surprisingly good, spun the engine with the starter (Plugs out) and it turned easy and smooth with no ugly noises.
Next, I removed all the CJ7 wiring and unwrapped the 4.0 wiring. After reading the 97 manual, wiring didn't completely match, and the fuel rail is different, so I checked online for determining the actual engine year. I'll get a 95 manual to complete the wiring but I have a question. How much does the PCM want for the engine to run good. In the old days, fuel compression and spark would get an engine running. Any insight is welcome. Thanks, Jack
I bought this FI 4.0 / CJ7 from a neighbor whose husband had died. It's a rusty mess from sitting outside unmoved for over 10 years so it's a project. Story goes that they had this 4.0 with 5 speed installed with the original Dana 300 and never could get it to run.
I have the tub off to work the rust issues so the cobbled-up wiring project is uncovered so I can see everything. The engine block says it's a 95. The PCM has 97 Cherokee written in that yellow marking that wrecking yards used so I initially thought I was dealing with a 97.
I bought a 97 Cherokee manual and quickly saw things were not quite adding up. I've pulled the plugs which were all OK, checked compression which was surprisingly good, spun the engine with the starter (Plugs out) and it turned easy and smooth with no ugly noises.
Next, I removed all the CJ7 wiring and unwrapped the 4.0 wiring. After reading the 97 manual, wiring didn't completely match, and the fuel rail is different, so I checked online for determining the actual engine year. I'll get a 95 manual to complete the wiring but I have a question. How much does the PCM want for the engine to run good. In the old days, fuel compression and spark would get an engine running. Any insight is welcome. Thanks, Jack