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Rough idle ON 97 FORD MECURY

The motor idling is rough
engine shut off when in idle mode

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The problem may be a buildup of carbon or fuel varnish deposits in the idle speed control valve (also called the idle air control valve or IAC valve). The cure for this condition is to clean the valve with some aerosol throttle cleaner or engine top cleaner. disconnect the air ductwork from the throttle body. Start the car and run at about 1500 rpms spray the cleaner directly into the throat of the throttle body. Turn off the engine and let sit for a few minutes. Then repeat the process a couple of times. if that does not work, you can remove the IAC and clean it by spraying into the two holes on the underside of the valve. If not, then you need to replace the valve.If that does not work , then check for a code. the throttle position sensor may be the problem. you can have it scanned at an AutoZone or other parts store.

Posted on Nov 28, 2008

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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.
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Let us know if you have something more to know else accept the suggestion.
Thank You for contacting

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