Question about 1998 Jaguar XJ8L

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Car speeds up in gear without using accelerator. Any idea how to fix

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Check to see that the throttle linkage and butterflies are not "hanging up." In addition, check the overrun valves to be sure they are not sticking; they are located at the front end of each intake manifold. Be sure the idle mixture is set correctly.

Other check, the auxiliary air valve may be your problem. It is supposed to bleed more air when the engine is cold to maintain engine idle speed. As the engine warms up, the valve closes down. However, there is an idle circuit also in this valve that adjusts the idle speed when the engine is warm. It is pretty common.

Keep us updated.

Posted on Sep 14, 2010

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Posted on Jan 02, 2017

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Daughter says that car is not accelerating right in 5th. When she pushes down on gas petal, the RPMs rev and it doesn't accelerate. But if she eases down on gas, it will accelerate. Car has a manual...


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Good luck
Hope this helps
Please leave feedback

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