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There could be several issues causing this problem. For one, I assume you meant 2000 rpm, not 20000 as the engine would have expired before reaching that number.
Checking the computer codes on this would be the safe thing to do as the Throttle Position Sensor could have failed or is sending the incorrect information to the ECU. Another possible issue to look for is a failure of the throttle return, if memory serves there should be a spring on the backside of the throttle body. If the spring is broken or missing, this could leave the throttle open enough to increase the rpm. I would also check the throttle body/throttle blade for dirt. Normally a dirty blade results in a decrease of rpm but it might be possible that it is sticking and not closing as it should. There are special throttle body cleaners available - do not use carb or brake cleaner as they could damage the throttle body. Let me know if any of the above helps.
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If you experience difficulty starting the engine when cold, stalling at idle, ... Also, this summer electric locks stopped working and recently car seems to idle high whensitting or when I put heat on. ... I was either braking and barely moving in traffic andwhen I would also turn on the ... 2004 Mercury Sable- 3.0L V699,000Visitor.
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
A high idle is caused by either a massive vacuum leak or a sticking idle speed control valve. I would think you have a vacuum leak, use a can of carb spray and shot around the top[ of the engine, if you hit a leak the engine will sound different, repair as needed.
Am not shure the kind of engin you really have but see if your stepping mottor is damage or need relpacing. that problem can happen if you have a faulty unit . it also called the step up unit or sensor, if your car have air condition is turned on and the rpm goes up and down that can be the problem , the unit can be found attached to the throttle body. just below.
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