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Nissan Altima Idle Speed

Q. Hello, I have a 1997 Nissan Altima SE 4 speed auto 4 cylinder, 75,000 miles, cruise, air. When I first bought the car it was idling at 500 rpm and occasionally it would idle at 900 rpm. Now it is always idling at 900 rpm. I looked at the throttle linkage in both situations and both throttle cables have slack at idle.

Recently I had to make a fast acceleration onto the interstate and after this the idle returned to 500 for a couple of days but now it's back to 900 again. Any ideas?

Thanks for your time.
Doug

A. The proper idle speed is right smack dab in the middle of what you have, 700 rpm in neutral with all accessories turned off.

I would suggest checking all the basics such as distributor cap, rotor, ignition wires and spark plugs (NGK BKR5E-11).

At this milage, a throttle body cleaning wouldn't be a bad idea at all.

Replace the air and fuel filters and check the ignition timing. If everything is looking good, you can, manually, adjust the idle speed to 700 rpm in neutral with all accessories turned off.

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