My 1997 XJ6 with 54,000 miles has a very peculiar problem:
After driving for 30 minutes or 30 miles (either one) the engine starts missing and gets progressively more severe until Check Engine light goes on and Transmission light after that. Eventually, it refuses to keep running. After parking overnight the check engine and transmissions lights are off and the engine will run smoothly and the pattern repeats.
I have replaced:
- All 4 O2 Sensors and both Catalytic Converters
- All Spark Plugs and Ignition Coils
- Air and Gas filters and cleaned the Airmass sensors
- EGR valve
- Inertia Switch
- Battery and Alternator
I get a P1775 code from the last episode. Local shops have tried multiple times and have not been able to fix the problem.
Desperate but love the car!
Joe in Virginia