Question about 1990 Nissan 300ZX

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300zx 1990 automatic non turbo 3rd and up gears are gone

It started when i would sometimes hit the gas and the gears where not catching so i would hav to let off the gas and slowly gradually push down, it was like that for a couple of weeks then when im goin around 40-55 the rpms would shoot for about 3-4 seconds then come back down and i wasnt pushing the gas hard or anything. finally it would do it around 3rd gear only letting me get to about 20 miles hr. i thought it was the tranny but could it be somethin else like a computer part or vacume hose that might connect to it please help its a good car and id hate to spend 300$ on a tranny and that not be the prob.

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  • mantaghi19 Oct 14, 2008

    i just changed my transmission and it still has the same problem iv
    changed the throttle module and put new headers in it. but now the
    speedometer doesnt work and it still smokes from the headers im jus
    about out of ideas too i need big help!!!!

  • Anonymous Oct 27, 2008

    I have similar problem but have lost reverse gear and 4 th ?? any i deas

  • lbtrumpet4li Dec 17, 2008

    I have a 1990 Nissan 300zx that will not go into 3rd or 4th gear and my speedometer has stopped working also.

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You need to do a transmission diagnostics. Its easy and will eliminate questions about the tranny and what's up with it including the complex sensors that inform the ECU how and when to shift. You'll find the transmission diagnostic process in the Transmission part of the online factory service manual.
Reading the indicator lights will give you a code and a diagnosis of the tranny issue. If your tranny checks out ok then you'll need to check the ECU. The manual also has a separate set of steps to diagnose the ECU. Since the ECU controls the shifting, if the tranny itself reports back as fine, the you'll likely have an ECU issue which should show up in the diagnostics and/or indicate what piece of equipment or sensor is causing the problem.
I would do these diagnostic procedures before replacing anything. Z32 parts are not cheap and you may be making unnecessary replacements. Since you already replaced the tranny and your problem persists I would advise going straight to the ECU iagnostics and identifying what is making it shift incorrectly.
Hope this helps.

Posted on Dec 28, 2008

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Glad to be of assistance - Please rate the response - I can learn from your rating. Thank you

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