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I'm having high RPMs and my speedometer is going crazy when I'm sitting still in park or while I'm driving and I just noticed that my mileage increases while I'm in park too. I know I need a tune up b

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  •  Stephen
    Stephen Dec 18, 2012

    I'm going to post this in the comments section in case someone wants to answer it directly. My guess would be a problem with the speed sensor in the transmission or the wiring between there and the cluster. You could unplug the speed sensor and see if the problem continues. It could be something shorting out inside the cluster too.

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  • 183 Answers

Instrument cluster is bad or board is cracked indicated by multiple issues if it where just the speedo going nuts i would say a speed sensor but in your case the instrument cluster i think will solve your issue

Posted on Dec 19, 2012

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Posted on Jan 02, 2017

  • 182 Answers

SOURCE: RPMs bounce around whenever in idle

The throttle position sensor could cause this problem.They are usually easy to replace.

Posted on Aug 24, 2008

  • 6 Answers

SOURCE: speedometer when crazy

my 99 had a sensor go bad that had similar symptoms. sensor is in rear "pumpkin". mounted on top. $41 at autozone. look at dodge truck forum, do a search.

Posted on Jun 19, 2009

pippall
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SOURCE: Ford Escape Hesitant to start, gauges going crazy?

open curcuit in crank sensor replace it.

Posted on Jul 24, 2009

  • 1 Answer

SOURCE: will idle high sometimes up to 3000 rpms when driving or sitting still

I have the same Jeep and same problem. The engine was running rough. The Jeep dealer fixed a vacum problem in the manifold and they then decarbonized and cleaned the fuel injectors. After these repairs the idle problem began, it would spike to 2000 rpm while sitting at idle, sometimes it would slowly come down, sometimes I would have to tap the accelerator. I took it back in and they then replaced the throttle motor and reprogrammed the PCM (Power Control Module?) Still same problem. Now they suspect a another vacuum leak and I am taking it back in on Tuesday, will let you know what happens, $ 1,300 so far.

Posted on Aug 08, 2009

  • 4088 Answers

SOURCE: my xj6 runs at high rpms and accelerates on its own

None of those possible problems have anything to do with idle speed. The first thing might be a very weak throttle return spring. The next would be a sticky throttle cable or foot feed pedal that isn't moving freely. Another possibility is a vacuum leak somewhere. Did changing the spark plug in #1 cylinder help the misfire? If not, you may have a partially plugged injector. Fixing the misfire will only increase idle speed some more. Look for an idle speed motor near the throttle body that is supposed to raise idle speed when the engine is cold and lower it back when the engine warms up. Check to see if it is holding the speed too high. If the throttle position sensor tells the computer where the idle speed motor is set, then it could have an effect on idle speed if the sensor is bad. The position sensor is just a fancy potentiometer. Hope some of this helps.

Posted on Aug 26, 2009

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