Question about 1990 Nissan 300ZX

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1990 300zx non turbo 150,000 miles developed a rattle or knock or a tick.... seems to change.... but not at idle at all. It seems to be loudest at the point of rpm increase very slowly and not when you stab the throttle but will become pronounced just as rpms start to decrease and then disappear when it comes back to idle...... 60lbs of oil pressure sounds like the middle of the engine some place..... possiblilities??

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  • coffeebeaner Jul 25, 2009

    pal03246 Nissan expert was right!!!! I cut the belt to the a/c compressor and the noise stopped... Got to be the compressor. Thanks A ton!!!! I was ready to take to dealer and spend big dollars!

  • coffeebeaner Jul 25, 2009

    solution #1 was right on I cut the a/c belt and the noise stopped
    thanks a bunch.... a/c much cheaper than new engine



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Obvioustly check to make sure that you have oil in it. If thats OK then remove all drive belts and retest for noise. Could be something else such as A/C compressor. Let me know what you find.

Posted on Jul 19, 2009

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