A faulty camshaft can cause your 1991 Nissan Maxima to idle erratically. A diagnostic test could verify the cause of the improper idling speed.
Could be IAC idle air control, or maybe a vacuum leak check hose first
fix the vacuum leak
"How do you move the idle tensioner for a 1998 3 litre dodge?"
where is the idle control motor for a 1998 ford escort
I have a 99 that did the same thing try the fuel regulator?maybe
Check the vacuum system on the car an at the transmission. If the car is computer controlled, check the computer codes for a possible problem.
Yes. IT can make the engine run to rich, and then cause misfires
how can I clean the Idle Air Control Valve on a 1998 Nissan Frontier
Might be the throttle Position Sensor or switch - causes it to idle erratically - jumps up and down in rpms. Got one the other day for a different type of car - was about 50.00. Not sure what engine you have - so don't know how to tell you to locate it. Might have your mechanic check that out - see what he says.
Idle is set automatically by the PCM utilizing sensor on th intake manifold to limit the Idle Air Control Valve. If any of these sensors malfuntions or unfiltered air is entering the manifold, your idle will be up and down continously when in park or neutral.
The idle speed is computer controlled and is not adjustable.