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2004 durango with a 4.7 v8, surges at idle upon start-up.

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The surges at idle could be a number of problems ranging from anything. if at all possible take it to a mechanic and have him or her run an obd diagnostic utility on it the surges could be from fouling spark plugs 02 censors....etc even a leaky gasket allowing water in the fuel will cause surger maybe even a fuel filter issue. hard to tell without any hands on with the vehicle.

Posted on Feb 18, 2009

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The "idle speed control valve" also known as "idle air control valve”. If this has not been looked at, try cleaning or replacing it. This will not always generate a fault in the E.C.U.but if faulty or dirty(sticking)it will give you erratic idling and high C O readings. So it is suggested to look is the Idle Speed Control Valve, which predominantly helps smooth engine speed under slight load and when slowing down at lights.The valve in question often gets clogged with carbon, and while it is controlled by the engine management computer the buildup of carbon can affect its ability to operate correctly. It's usually a fairly easy process to locate remove and clean the valve. It's the cheapest place to start and there's a good chance it will fix the problem.The air flow meter (or sensor) would induce a diagnostic fault code in the engine's computer if it were to have a problem. This may not always be the case however which makes it that much trickier to diagnose. There should be test procedures to conduct on the air flow metre to confirm a fault, so a more definite diagnosis (rather than a could be this, could be that scenario) is needed here.
I would recommend taking the car to a Nissan agent, as they have probably dealt with this issue before. Expect a higher hourly charge, but they should have the background and specialised equipment to quickly pinpoint the fault.
Idle control on the road is different to idle control at standstill. With no load, the butterfly plate in the throttle allows sufficient air to bypass when it's closed to maintain a constant idle speed.
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Let us know if you have something more to know else accept the suggestion.
Thank You for contacting Fixya.com



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http://www.modifiedlife.com/2005-dodge-durango-car-radio-stereo-audio-wiring-diagram/

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