Hello, jag-lovers!
Since buying my XJR 1995 I’ve been having an intermittent no-start issue. I concluded it was immobilized and made this forum post
After not being able to solve the immobilizer issue after much troubleshooting I decided to spend a lot of money on a reprogrammed ecu where the immobilizer function was disabled. The seller told me that as long as I got the car cranking, (which I currently get by probing ground to the pin in the bpm that makes CEL light up) it would start up with this ecu since it would not need a signal from the security module to start fueling.
Sadly this was not the case. I still have the same symptoms, No fuel (no 5-second prime when turning the key) and no spark (I have tried with starter gas and checked visually for a spark.). The fuel pump and relay works, and the spark plugs are all new. All ignition relays work.
I am now wondering if I have multiple faults, not just the immobilizer. I have already tried bypassing the inertia switch and swapped the cps to a new one. The tacho still does not go up when cranking which from what I read means the cps is not working, since I definitely have a working sensor could it be something else?
Worth noting is that I also have the gearbox caution light in the dash and my OBD2 reader shows me code p1791 which I think has to do with throttle position.
Very thankful for any help. The Jag is just collecting dust now which is a shame.
Best regards, August.
