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Juan Crespo
Juan Crespo, ASE Certified Technician
Category: Jaguar
Satisfied Customers: 1526
Experience:  A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
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1998 xk8 84,000 gh pressure ps hose blew, had that fixed

Customer Question

1998 xk8 84,000 high pressure ps hose blew, had that fixed found small coolant leak had the manifold fixed , now it cant find its rpm setting , at start it goes up to 28 then down to 5 back up to 12 down to 9 then just back and forth when I put it in drive it stays right at 1000 nd wants to push you forward, if you try driving and your at about 1200pm every now and then it just shoots up to three for now reasone
Submitted: 1 year ago.
Category: Jaguar
Expert:  Juan Crespo replied 1 year ago.

Hi there. Welcome to our site.

If that idle hunting wasn't there before the manifold repair, it could be the vacuum hose going to the throttle body got disconnected, or the wiring connectors to the throttle motor and position sensors didn't get pushed in far enough. However, if all of that is OK, then you might be looking at a bad throttle body assembly - available online used for about $120. Click here for example.

Best Regards.