Question about 1992 Nissan 300ZX

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92 300zx rpm will not go over 2500 rpm pops from intake

1992 300 zx non turbo ,starts good will not rev moor than 2500 rpm ,and sounds like it hits a rev limiter and pops from intate ,but on the throttle position switch it has 3 wires from plug but i can only find 2 from the harness to the plug were dose the 3rd come from

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  • beautybydina Jan 11, 2009

    can some one help

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This is a classic symptom of a bad mass airflow sensor. Nissan designed this as a protective feature on the car. If the mass air sensor goes bad, the computer limits the car to a 2400RPM rev limit to prevent damage.

The sensor is under the center nose panel between the headlights. Take that off and on the back of the airbox (which fills this space) you'll see a pipe coming out that meets at a "T" with another hose going across and down under the headlights. That pipe off the back of the airbox is the mass air sensor (it has a harness plugged in).

Posted on Mar 27, 2009

  • Koulaev Artour Oct 01, 2011

    On my 90 300zx i have a similar problem. It cuts the power to idle after 2000rpm only when the engine's at its operating temperature. But then when i keep pushing the gas pedal it gives a big kick and works only on acceleration till i let go of the pedal a little bit - it cuts it again. I wonder if this problem also relates to the bad MAF sensor.

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