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Matt
Matt, Mechanical Engineer
Category: Jaguar
Satisfied Customers: 22000
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Why would a jaguar S type (sport plus 2.5V6) suddenly cut out

Resolved Question:

Why would a jaguar S type (sport plus 2.5V6) suddenly cut out when driving? It suddenly lost all power - steering etc. but started again after a few minutes and has run ok since.
The fuel was very low - maybe dirt in the petrol? Or electrical fault?
Also the A/C only heats at present - ideas why?
Submitted: 3 years ago.
Category: Jaguar
Expert:  Matt replied 3 years ago.
Hello

if the fuel was very low then yes you can pull in dirt from the bottom of the tank

this can clog the filter and stall the engine so it would be worth replacing the filter

But 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.

as for hot AC then I'd 1st check the gas level is up to pressure as no gas means no cooling
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