Question about 2002 Dodge Durango

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Cant get a smooth idle while car is stopped. RPM keeps going up and down and I already replaced the throttle sensor. RPM jumps as high as 4000. What is causing this? Im at 145000 miles on the vehicle

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Try replacing the idle air control valve. this control your idle speed,it is really easy to replace ,just 2 screws and a electric plug connection. Check around at the different auto parts stores and get a good price , do some comparison shopping. Your thottle sensor just acts like a accelerator pump on a carb. it tells your computer that you need an extra shot of fuel to your injectors when you press on the gas pedal..

Posted on May 26, 2011

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IDLE AIR CONTROL VALVE, Dodge has some major issues with them

Posted on May 26, 2011

  • tom echlin Dec 08, 2012

    todd, i am on my third idel air control valve. Can't get it to idel till it warms up and then sometime it just stalls.

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You are equipt with a idle speed control motor.There is no way cleaning is going to clear it,When the RPM jumps it is either working and trying to compensate for a vacuum leak.Have the vehicle running as it jumps up and down feel the EGR is it hot to touch? Becuase that can cause the jumping RPM,Check the PCV valve with the car running plug it does the RPM stabalize? If it does replace PCV. You are searching for a vacuum leak

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Well all cars idle at 550 rpm to 700 rpm depends on engine but it sounds like you throttle body is not shutting down .
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To do this in park or neutral is normal. To do it while driving is not.
There are so many things that could cause this but if you have no check engine light and it runs normally up until then I would suspect you have an exhaust restriction. This can be checked fairly easy on this vehicle, it has a DPFE sensor that mounts near the top back side of the motor.It will either be black or silver,will have a 3 wire connector to it and 2 hoses going down the back of the motor to the exhaust. You can disconnect one of these hoses and install a vacuum/pressure guage and measure exhaust back pressure. It should be 1 psi or less at idle and when you go to wide open throttle should not exceed 3 to 4 psi. If it does something in exhaust,most likely one of the catalytic convertors is stopped up.

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