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2004 XJ8: parking brake..turn key..then same thing occurs again…

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2004 XJ8, While driving the...
2004 XJ8, While driving the car slows to almost a stop, but will keep moving forward very very slowly. A parking brake message comes up on dash. By trial and error, I realized that if i stop and turn key off, let it rest a minute, then when turn back on it will run normally - for a while the then same thing occurs again. Our local dealer has closed here in St Louis, so had it towed to RPM Car Care Inc. The mechanic says it hasn't occurred so far while they've had it, but thinks it may have something to do with the computerized security system that is receiving message that someone is breaking into the car and it disables itself?? Since I've had years of good care withe Moore Jaguar, I'm concerned that this new independent service I'm not familiar with may not be seasoned enough, do you have thoughts? Jerry Mathews XXX-XXX-XXXX. Thanks
Submitted: 10 years ago.Category: Jaguar
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Answered in 3 minutes by:
2/4/2012
Jaguar Mechanic: Richard, Jaguar Technician replied 10 years ago
Richard
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 16,762
Experience: 12 years at a Ford/Lincoln Mercury and Jaguar dealer as technician and shop foreman.
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Hello and welcome to justanswer.com

 

DId any other warnings come on like restricted performance, engine failsafe, or DSC fault? Did the engine warning icon come on?

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Customer reply replied 10 years ago
Maybe DSC fault, I think. and the wayvy car symbol -swerving?
Jaguar Mechanic: Richard, Jaguar Technician replied 10 years ago

Ok that makes sense.

 

based on your description I suspect a problem with the electronic throttle. The throttle is only replaced as an assembly. You can try cleaning it with a lint free rag with a small amount of throttle cleaner on it. To be sure we will need to use a compatible scan tool to read the stored fault codes. Try your local parts store like pepboys or autozone to see if their OBD II tool can read any faults in the ECM (Engine COntrol Module).

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Customer reply replied 10 years ago
Richard, since car is already at a repair shop[one I've never used] , can you suggest what this repair ought to cost, esp if needs replacement as an assembly?
Jaguar Mechanic: Richard, Jaguar Technician replied 10 years ago
The throttle is expensive as it lists for about $900.00 plus about a 1-1.5 hour labor charge.
Richard
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 16,762
Experience: 12 years at a Ford/Lincoln Mercury and Jaguar dealer as technician and shop foreman.
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Richard
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Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 16,762
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