I'm baffled
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I'm baffled
I have a really weird thing happening on my XJ8 4.0, it's a model year 2000.
1. Start the engine and let it run for 10 minutes.
2. Suddenly the engine surges without any input from me and goes up to 2000 revs, when I hit the accelerator the revs rise but then fall back to about 2000.
3. Switch the engine off. It then cranks but will not start accompanied by the warning "engine failsafe mode".
I had this happen a few weeks ago just as I got home and haven't used it since as I have been waiting for a break in the lousy weather as the car is stuck on my driveway.
Any ideas ?? Thanks
1. Start the engine and let it run for 10 minutes.
2. Suddenly the engine surges without any input from me and goes up to 2000 revs, when I hit the accelerator the revs rise but then fall back to about 2000.
3. Switch the engine off. It then cranks but will not start accompanied by the warning "engine failsafe mode".
I had this happen a few weeks ago just as I got home and haven't used it since as I have been waiting for a break in the lousy weather as the car is stuck on my driveway.
Any ideas ?? Thanks
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The saga continues. Cleaned the connectors on the throttle body, the throttle body itself is totally clean inside. Put everything back together and the car started straight away with no problems.
Let it run on the driveway up to operating temperature, shifted through the gears, revved the engine, the usual stuff. Did not go out onto the roads. Switched the engine off and then attempted to restart but got "Engine Failsafe Mode". Did a soft reboot, still the same. Did a hard reboot, still the same. Any ideas where I go from here please ?
Let it run on the driveway up to operating temperature, shifted through the gears, revved the engine, the usual stuff. Did not go out onto the roads. Switched the engine off and then attempted to restart but got "Engine Failsafe Mode". Did a soft reboot, still the same. Did a hard reboot, still the same. Any ideas where I go from here please ?
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Thanks QuadManiac, I think you are right and I have multiple issues.
So this morning I went out to the car, gear shift in P and turned the key..."Engine failsafe mode". Put the gear shift in N and turned the key....the engine started.
Maybe I just need to pump the tires up or change the wiper blade or clean the carpets ..........or jump off a bridge !!
This is just so infuriating it makes me want to start wearing a trilby hat with a feather in it and smoke a pipe.
So this morning I went out to the car, gear shift in P and turned the key..."Engine failsafe mode". Put the gear shift in N and turned the key....the engine started.
Maybe I just need to pump the tires up or change the wiper blade or clean the carpets ..........or jump off a bridge !!
This is just so infuriating it makes me want to start wearing a trilby hat with a feather in it and smoke a pipe.
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Thanks Gus, I think you are spot on. I contacted an Ebay Jag breaker and they won't sell the switch alone because he said EVERYONE wants just the switch so they sell the J gate complete with the switch for big bucks. Sounds like you are right when you say that it is a problem waiting to happen on the older XJ8's. New switches cost a fortune so if you come across a J gate or three, get your hands on them.
This switch could be the cause of so many gearbox warning messages as it slowly breaks down but is only an intermittent fault until you get what I have which is no start in P but will start in N.
This switch could be the cause of so many gearbox warning messages as it slowly breaks down but is only an intermittent fault until you get what I have which is no start in P but will start in N.
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