Question about 1994 Nissan Maxima

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Uneven oe irregular idle speed when warm

My 1994 Nissan Maxima has begun to have an uneven or irregular lope condition once it has warmed up. I have replaced the EGR valve and tried several other sensors to no avail. I found a vacume line that appears to be connected to a charcoal filter of some type but does not have another end to connect to. I do not have any service information on the car and have not been able to locate a book at any of the local auto parts places.

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You may have a clogged fuel injector. If it repeats and clears up.


Posted on Oct 28, 2008

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If the car has the original PCV valve, it's overdue for replacement. If not, PCV valves are inexpensive and easy to replace, therefore you can give it a try. However, a faulty valve and accompanying vacuum issues will usually cause a rolling, or somewhat rough idle. Once tested and eliminated or replaced, if you still have a low idle condition continue reading.

The Idle Air Control motor (inside the throttle body) controls idle using a variety of inputs through the Powertrain Control Module. Rough idle and stalling most often occur when the idle speed drops below normal rpm. This can be caused by an issue with any one of the inputs which control idle through the PCM or a problem with the Idle Air Control motor. Let me know how things work out for you on this. Good luck.

Posted on Aug 28, 2008

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