rpm620
NAXJA Forum User
- Location
- Bunker Hill, WV
I have been looking all over the internet trying to figure this out with no luck so I'm posting here in hope some one can make sense of this.
1996 XJ Sport
4.0L
225k
Auto
My original 4.0 motor died about a month ago. We went ahead and swapped a Reman Motor from Jasper Engines into it. All new sensors where put in with it along with new Cap/rotor/plugs/wires. When we went to start the jeep it would start and Die, after that we checked all the sensors again even tho they where new and the checked out good, Also made sure that the flex plate was good prior to even putting the new motor in.
The last thing we thought about was a possibility of the 1996 PCM going bad. This is where this whole issue gets really interesting. We have the 96 XJ that has a new motor and wont run, and we have a 1999 Jeep XJ that runs perfectly fine. The 99 PCM technically should not run the 1996 at all. To make this easier to understand im going to just list what PCMs start and run the 1996 and what PCMs start and run the 1999. ** Note I'm not saying Driving just getting the motor to start and run.**
1996 Jeep XJ "STARTS AND DIES" with the following PCMs
1. Original PCM
2. Brand New PCM
1996 Jeep XJ "STARTS AND RUNS" with the following PCMs
1. 1999 PCM
1999 Jeep XJ "STARTS AND RUNS with the following PCMs
1. 1999 PCM
2. Original 1996 PCM
3. Brand New 1996 PCM
so basically it will start and run with a 99 PCM but neither of the 96 PCMs. Which does not make any sense at all. Could we have an incorrect Crank Position sensor?
Thank you all for any help you could provide.
Mike
1996 XJ Sport
4.0L
225k
Auto
My original 4.0 motor died about a month ago. We went ahead and swapped a Reman Motor from Jasper Engines into it. All new sensors where put in with it along with new Cap/rotor/plugs/wires. When we went to start the jeep it would start and Die, after that we checked all the sensors again even tho they where new and the checked out good, Also made sure that the flex plate was good prior to even putting the new motor in.
The last thing we thought about was a possibility of the 1996 PCM going bad. This is where this whole issue gets really interesting. We have the 96 XJ that has a new motor and wont run, and we have a 1999 Jeep XJ that runs perfectly fine. The 99 PCM technically should not run the 1996 at all. To make this easier to understand im going to just list what PCMs start and run the 1996 and what PCMs start and run the 1999. ** Note I'm not saying Driving just getting the motor to start and run.**
1996 Jeep XJ "STARTS AND DIES" with the following PCMs
1. Original PCM
2. Brand New PCM
1996 Jeep XJ "STARTS AND RUNS" with the following PCMs
1. 1999 PCM
1999 Jeep XJ "STARTS AND RUNS with the following PCMs
1. 1999 PCM
2. Original 1996 PCM
3. Brand New 1996 PCM
so basically it will start and run with a 99 PCM but neither of the 96 PCMs. Which does not make any sense at all. Could we have an incorrect Crank Position sensor?
Thank you all for any help you could provide.
Mike