I've had this crazy incident happen 5 or six times.


Driving freeway speed of 70-80 the car just dies -- except the engine is still running. The car is in gear -- and I can't remember if it's in D or in 4 as I do tend to switch between the two.

I pull over on the freeway. Put the car into Park and then drive. The car doesn't move. I push on the accelerator, but there is not real change in RPM - it sits at idle. If I turn the car off and wait a couple minutes, then 'reboot' and start again, go into gear, I'm good to go.

It's a 2004 XJ8 and has about 50k miles. The warning lights included:

1) Parking brake failure
2) Engine Failure
3) DSC Not available

It happened at lower speeds too. I was always able to get it going again. But the last time took awhile.

Serious safety issue.

Finally got it to a dealer and took them a day to figure out what was going wrong:

Turns out that the following parts had failed:

1) Throttle Body
2) Mass Airflow Meter

The good news is the dealer informed me these are still covered here in California under the emissions warranty.

I'll pick up the care again tomorrow.


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Hi,

The TB is a common problem on X350s. THe MAFS is a little surprising. I wonder if it was actually bad or just replaced too.

 

What about the parking brake fault?