Engine dies at idle and runs rough at certain rpms. Have replaced fuel filter, spark pugs and wires, throttle position sensor, coolant temperature sensor and air filter.
Could be a dirty throttle body, vac leak, or a defective idle air control valve. The computer adjusts idle speed by controlling the amount of air entering the throttle body via the control valve.
Is the check engine light on ?
You could unplug the valve when engine idle is above 1000 RPM. The check engine light will come on, but the valve would stay in place. If that takes care of the problem, the valve may be the problem. It has a small electric motor inside that opens and closes the valve.
I will try that tomorrow. Thanks!
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SOURCE: 96 Nissan Maxima continues to have engine light
I had a similar problem - took it into 'Nissan Professionals' and they changed everything you did as well, and had no luck. After 4 or 5 times working on it, they told me that it was a 'loose wire' that had to be re-soddered and then the problem was fixed. I don't know where the wire was, but they made it sound like it was in or around the fuse panel under the hood.
I hope this might shed some light on the problem.
SOURCE: 2002 Nissan Sentra Loses Power
SERVICE IT .....OIL PLUGS, AIR ,FUEL AND OIL FILTERS GET TROTTLE SENCOR AND THE MASS AIR FLOW SENCOR CHECKED
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There has been no check engine lights. Had it scanned too. The vehicle has 122,000 miles. Is there a way to test the idle air control valve? As I've replaced parts it would run well then next time mess up again.
By running well it would be that day of repair. The next day there would be problems off and on again
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