Hello everyone,
This is my first thread and I want to first start by saying thank you for all of your other posts and explanations. I have learned a lot from reading these posts from this site. That's a major reason I joined.
Now, my problem. I have a 2003 X (Non Rubi) 4.0 auto trans, no SKIM that I swapped in a 2004 Rubicon ECU and SKIM module, key and tumbler. The reason for doing this was my gauge cluster stopped working and after a long time of trouble shooting the ECU was my problem. After the swap everything came back to life and worked fine, but I didn't drive it the day I swapped all this in. I only started it and it ran idled fine and all the gauges worked again. So, I drove it last night and the speedometer goes to max almost immediately while the jeep is only going about 15 -20mph. Everything runs fine and shifts fine, but once the mph hit 95 the rev limiter steps in and I'm stuck doing 20. What would cause this? It ran and shifted fine with the "bad" ecu in there. Could this have something to do with not updating the vin in the new ECU yet? Does it have to match the TCM vin? I have a programmer that will change the VIN I just haven't tried it yet. I wanted to see if there were more experienced people here that might know what I am experiencing.
I have "relearned" the TCM and reset the ECU many times. Let me know your thoughts please. I am going to put in my VIN tonight to see if it changes anything, but I don't have a lot of faith in that being the fix.
Do I need the TCM from the Rubicon I took the ECU and parts out of?
Thanks again!
This is my first thread and I want to first start by saying thank you for all of your other posts and explanations. I have learned a lot from reading these posts from this site. That's a major reason I joined.
Now, my problem. I have a 2003 X (Non Rubi) 4.0 auto trans, no SKIM that I swapped in a 2004 Rubicon ECU and SKIM module, key and tumbler. The reason for doing this was my gauge cluster stopped working and after a long time of trouble shooting the ECU was my problem. After the swap everything came back to life and worked fine, but I didn't drive it the day I swapped all this in. I only started it and it ran idled fine and all the gauges worked again. So, I drove it last night and the speedometer goes to max almost immediately while the jeep is only going about 15 -20mph. Everything runs fine and shifts fine, but once the mph hit 95 the rev limiter steps in and I'm stuck doing 20. What would cause this? It ran and shifted fine with the "bad" ecu in there. Could this have something to do with not updating the vin in the new ECU yet? Does it have to match the TCM vin? I have a programmer that will change the VIN I just haven't tried it yet. I wanted to see if there were more experienced people here that might know what I am experiencing.
I have "relearned" the TCM and reset the ECU many times. Let me know your thoughts please. I am going to put in my VIN tonight to see if it changes anything, but I don't have a lot of faith in that being the fix.
Do I need the TCM from the Rubicon I took the ECU and parts out of?
Thanks again!