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Matt
Matt, Engineer
Category: Jaguar
Satisfied Customers: 20605
Experience:  Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
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My jaguar 2004 runs great but after awhile it lose power. I

Customer Question

My jaguar 2004 runs great but after awhile it lose power. I cut off car for awhile and started it back up and it run perfect and it do it again. what's wrong?
Submitted: 1 year ago.
Category: Jaguar
Expert:  Matt replied 1 year ago.

Hello

This sounds like an electrical actuator or sensor at fault .Usually when you can cycle the ignition key on / off and then restart the engine and the fault is gone temporarily this indicates that this is an electrical component causing this issue.

This could be a wiring issue as things tend to expand when hot and its possible a poor or partial electrical connection is being pushed apart on one of the major sensors so check the connection plug and wiring to the following;

Airflow meter

Crank position sensor

Cam position sensor

O2 sensor

Throttle position sensor

Also worth checking the connections to the fuel pump for the same reason - unplug each in turn and give them a good squirt of switch / contact cleaner - Not WD40

and also unplug and inspect the main power relays and fuses for signs of overheating or corroded terminals- so the ones for the ECU and the fuel pump

And also unplug the wiring loom connections in the engine bay one at time and inspect for corroded or recessed pins.

Expert:  Matt replied 1 year ago.

Hello

do you still need help?

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