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check engine light on ? check your wires for crack rips coming from the coil packs , the coil packs themselves or the spark plugs check for oil on them
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 ?
these are notorious for this problem-a leaking intake gasket at #4-it can be verified by using a can of carb cleaner. Spray around #4 intake port, if the idle changes you have the same issue. Do NOT clean the throttle body on these cars, it is so sensitive that a 25 RPM change will set another code that you'll never get rid of unless you replace the entire throttle body. I work on my neighbor's Altima, there are no shortage of quirks with these cars. Here is a link specific to your issue, with owners who want a class action against Nissan:
My 1994 Altima has always had rough idle but runs smooth. I now have 176,000 miles on it and drive it daily. Best car I ever owned. I wouldn't let the rough idle bother me.
First though, disconnect battery for 1/2 hour. Restart engine and drive for 15 miles while computer relearns changes you made. Will run rough for this period.
the 2001 altima is what i have and I had the same problem as you. turned out to be a bad head gasket factory used cheap ones for a few years before they found the problem. one way to test this is to get a can of carborator cleaner and spray it around the area where the head meets the block under the intake problem should be around the 4th cylinder or close to driver side. if the head gasket is bad the rough idle will smooth out while you are spraying the head.
Hi Jerry,
Is the idle surging?? going up and down, while at idle?? and not beeing nice and smooth, or the RPM's just drop down and the car dies?? You don't want to touch any of the factory settings on the throttle chamber aka idle screw on the throttle body. That's factory set for life. You may have a IAC -AAC valve problem which a "air volume control valve". Buut let me know first, what you find as far as the "surging up/down goes", but it doesn't die.
I have been having this problem, first definitely check out the
throttle body to see if its gummed up and you can try to clean that by
spraying carb cleaner into it, check all your filters, check the idle
air control valve and spray with carb cleaner but not onto any
electrical connectors, crank the car and if it doesn't start then give
it a bit of gas while cranking and it will idle rough and it will smoke
a bit to burn off the cleaner, and hold rpms until it the idle smooths
out, if that doesnt work then maybe a mechanic?
what year is your suburban? Previous model did not have ECM software to cope with carbon build-up in the throttle body intake. First car will idle rough, then will stall intermittently. Good news is that a rag and a can of carb cleaner will remove the black carbon on both sides of the throttle gate, then car will run smoothly.
Throttle body located on top, front of engine, so very simple to access.
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