Question about 1996 Nissan Maxima

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Unstable idle i have a 1996 nissan maxima sometimes it runs great but sometimes it runs like it has an unstable idle sometimes is around 70 rpm at a stop light but then at the next stop light it will go down to 450 rpm it doesn't have a stable idle. What could be wrong with my car?

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  • miguel_nava1 May 09, 2009

    i already replaced my idle air control valve it didn't fix it. well i was reading that everytime you remove a tps sensor you have to adjusted. I did took it off once whe i installed back i didn't adjusted could that be it?

  • tommywill92
    tommywill92 Oct 08, 2012

    i have been working on nissan for 20 years this is a problem i have seen alot after these cars get older check the intake for carbon build up open the throtlle with mass air flow removed if you can see dark build up in the intake the only way is to removit and clean you will find that the egr will be stoped up with carbon it will give codes for every thing dont count on a scaner for telling you whats wrong the older cars isnt advance as latter models today check all vacum lines i hope this will help anyone

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I had a similar problem, i took it into Nissan, had the codes cleared, drove it till it happened again, got Nissan to tell me the codes and what they mean, the only fault that came up was temperature sensor, the one for the CPU not the Guage. I replaced it $70, that was 2 years ago and the problem hasn't occured again.
My assumption as to why the engine would "hunt" and drop idle was that the CPU would see that the engine was cold (intermittant fault with CPU temperature sensor) and increase the fuel delivery to the engine ((The CPU will do this when the engine is cold, (same as the choke on the old carby engines), allowing the engine to start and run eaiser until the engine reaches operating temperature)) causing it to over fuel and choke sometimes stalling.

Posted on May 20, 2009

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Check to see that the air meter hose that goes to the throttle body is in good condition and not cracked or torn, If you are getting unmetered air it will cause the surge condition. If you have had a tuneup lately, part of that is taking the hose off to get to the filter...
Good luck...i hope this helps...

Posted on May 09, 2009

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You will need to check the Mass airflow sensor and the Idle position sensor.

Posted on May 09, 2009

  • Randy Hough
    Randy Hough May 10, 2009

    It is possible that it needs adjustment.

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