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rpm goes up & down
05-30-2015, 12:36 AM
Post: #1
rpm goes up & down
I have a 1999 nissan altima automatic, everytime i use the ac on the gauge on the rpm goes up & down at idle, is it normal, how do i correct this.Sad
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05-30-2015, 09:33 AM
Post: #2
RE: rpm goes up & down
I'm not as familiar with the Nissan as I once was but any time I hear something like this (with all the automatic controls these days) I shoot for the simple approach first. What I would do is go over all the vacuum lines. Chances are you have one that is either collapsed or broken open. (hey, the car ia 16 years old) I would also clean the IAC (Idle Air Control) so it can more quickly compensate for the speed changes. If you are not sure what to do with the IAC let me know and I will try to walk you through it.
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