Question about 2002 Nissan Sentra

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Rough idle i have changed all coils and plugs

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Hi
If your car runs rough or stops running while at a stop the main thing would be a vacuum hose leak.
What is happening is that the fuel/air mixture is off. At idle or lower speed there is more air than fuel being mixed because of the vacuum leak causing the engine to stall out.
That is why it runs fine as it warms up because the fuel mixture is richer, as the car warms up the fuel mixture decreases.
As you drive the car at normal speeds such as on the freeway, the fuel mixture increases bringing balance to the fuel/air mixture.
The vacuum leak in the hose is causing too much air to be added into the fuel/air mixture causing your engine to run lean while at an idle.
To locate the leak get a can of carb cleaner. Have someone help you keep the car running while you squirt the car cleaner around the different vacuum hoses. When you spray a section of hose and hear the engine smooth out or the RPMs increase, that area is your problem. Keep squirting the area until you are able to locate the hose with the leak.Remove the faulty hose .However if you take to a shop and they place it on the computer and tell you that the Oxygen sensor is faulty, tell them to check for a vacuum hose leak. The computer will of course report a faulty Oxygen sensor because the vacuum leak is causing the fuel/air mixture to be off.

Have you checked the EGR valve? It may be leaking, touch it with a wet finger at idle, if it is leaking it will be very hot, the cause is either carbon or back pressure transducer problem, another issue may be fuel pressure so check the pressure .
Let us know if you want to know something more else please accept the suggestion.
Thanks for contacting fixya.com

Posted on May 12, 2010

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