Question about 1997 Nissan Pickup

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On of mass air flow sensor Truck idles fine but will not take gas misses and backfires then stalls

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If the air mass sensor gets coated with foam from the PVC, then it won't increase the gas supply when you open the throttle, because the foam insulated the heat element in the sensor.
Just take it off and clean it will any sort of degreasing spray, then put it back on. At this age, you should probably consider splicing a condenser into the PVC hose, to take out oil and water vapors.

If that does not work, it could be the temperature sensor or O2 sensor. When sensors go bad, they usually go to 0 or infinite ohms with an ohmmeter.

Posted on Sep 11, 2010

  • Tony Buchko
    Tony Buchko Jul 22, 2012

    changed mass air flow did not help. changed temp sensor. did not fix it.


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