Hi Richard, I'm not an expert on Jags, just a little jealous I don't have one. Looks like a very nice vehicle. Have a close look, inspecting all hoses and vacuum pipes on the intake manifold side of the engine for any damage or loose fitting. The problem seems to be a leakage of air which is raising the idle speed. Regards John
SOURCE: Car won't pull back speed when foot off accelerator
Very possibly a vacuum issue. Maybe a line that needs vacuum for the trans is on an inlet that effects the throttle. Not sure how old your vehicle is.
SOURCE: jaguar x type...started the car
if there is also black smoke coming out the exhaust - and the problem is intermittent - then it's the EGR valve - it sticks open - will need replacing.... Happened to mine this morning and this is what the Jaguar Assistance guy said. Mine is a 2006 2 litre X-type.
SOURCE: engine wont back off speed when foot taken off accelerator
Jaguar has a cleaning procedure for these cars . The TBI needs to be cleaned and the throttle body relay needs to be changed /replaced. I am sure the Yellow ck engine light is on with a throttle motor code in the PCM
SOURCE: engine wont back off speed when foot taken off accelerator
low voltage to the Throttle Body unit causes this problem along with a dirty buttery fly . Have the throttle body cleaned asper Jaguar cars service spec and replace the throttle body motor relay located in the engine compartment center row 2nd back . Then dissconnect the battery for 30 minutes and reconnect .
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