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Thread: Over revving and overdrive problems

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    Default Over revving and overdrive problems

    My 2001 ZX2 atx has a peculiar set of issues with the transmission.

    First issue: On initial startup, it will over rev in first gear, reaching 4000 rpm before changing gear with a sudden *bump!*. This happens far less often in regular drive (as opposed to overdrive). I don't know if its skipping a gear, or lurching forward from having revved so high before shifting into 2nd. I don't know if it's me, but this behavior seems to lessen during warmer weather. Many times when I stop at a sign, a light, etc., this will happen. Accelerating more aggressively seems to decrease the chance this happens and/or reduce the intensity of the *bump!*.

    Secondly, on the highway, it will frequently fail to shift into overdrive. Coming to a complete stop for a minute seems to give me overdrive back most of the time. At least until...

    Thirdly, there seems to be an instability in maintaining gear, as it will sometimes shift back and forth between overdrive and 4th, 4th and 3rd, 3rd and 2nd, etc trying to maintain whatever speed I was going between the two gears that can support it.

    And finally, it just seems to idle at a lower RPM than it used to.

    The check engine code told me it was the input/output speed sensor, so I had that replaced (to no change in behavior).

    I have had the transmission flushed, similarly to no change.

    In my non-professional, totally newb and layman opinion, the two possible culprits would be a dying transmission (which the solution would be to replace or rebuild) or a cpu problem (requiring either re-flashing replacing). I have a very basic grasp of vehicle engineering.

    I tried to look up similar problems, but none have had quite the same set of issues, and emissions are coming up (as you can imagine the nosedive that fuel efficiency has taken). Any insight would be much appreciated to help make the most cost effective and correct solution.



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    for the superman of the zx2 savers - daggit2005 Henry Ford < Dareall - SR2000 For the entertaining builds...constantly :-) - CJW For being a great member and friend to many. - CJW you sir are awarded the medal of awsome - daggit2005 
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    vacuum problems, axle problems and motor mount issues cause these problems at times. Do you have a check engine light on right now? Also, how is the car at idle and at stops?
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    Quote Originally Posted by dareall View Post
    vacuum problems, axle problems and motor mount issues cause these problems at times. Do you have a check engine light on right now? Also, how is the car at idle and at stops?
    The check engine light is on, and it idles and stops with no anomalous behavior.

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    for the superman of the zx2 savers - daggit2005 Henry Ford < Dareall - SR2000 For the entertaining builds...constantly :-) - CJW For being a great member and friend to many. - CJW you sir are awarded the medal of awsome - daggit2005 
    Scammer Slaughering Medal of Honor - Hardline this is for the candy ive got from you with my purchases the past few years. - blue99fordzx2 For moving/locking my post when asked :) - blue99fordzx2 Thx for helping me get my car put back together. - X-Lr8 It's lunch time here. lolz - rascal 
    For dealing with dumbass n00bs. - RASCAL How much for the trim piece? LOL - RASCAL Absolute hero. I cannot imagine how helpful and kind a person Dareall is.  THANK YOU. - SoCalZx2Rob For doing my part out and finally getting the parts sold.  I owe it all to you.  Thanks Dareall.  I'll never forget it.  Thank god it's finally done.  XD - SoCalZx2Rob 

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    Quote Originally Posted by gakt947 View Post
    The check engine light is on, and it idles and stops with no anomalous behavior.

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    have you had the car checked for the code? if so, provide the number for the code (not a description of the code) and whatever you do, DO NOT erase the code when you get it checked

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    You could try adding a couple ounces of tranny fluid at a time to see if it smoothes out. Did the shop who did flush use the correct fluid? Your observation about smoother shifting in warmer temperatures tells me that the resulting expansion in fluid level is helping the situation. Fluid type and level is key on an old ZX2 auto trans.

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    Quote Originally Posted by dareall View Post
    have you had the car checked for the code? if so, provide the number for the code (not a description of the code) and whatever you do, DO NOT erase the code when you get it checked
    By erase, do you mean "get the check engine light turned off"?

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    Quote Originally Posted by d-dogg-e View Post
    You could try adding a couple ounces of tranny fluid at a time to see if it smoothes out. Did the shop who did flush use the correct fluid? Your observation about smoother shifting in warmer temperatures tells me that the resulting expansion in fluid level is helping the situation. Fluid type and level is key on an old ZX2 auto trans.
    What type of fluid is the correct one?

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    Quote Originally Posted by gakt947 View Post
    By erase, do you mean "get the check engine light turned off"?

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    Correct. By erasing the codes, the CEL should go off

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    Quote Originally Posted by gakt947 View Post
    What type of fluid is the correct one?

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    It uses Mercon V. Any mention on receipt of what fluid was used?

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    Is your third brake light bulb working? I seem to recall that affecting something with the transmission.
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    Quote Originally Posted by pextor View Post
    Is your third brake light bulb working? I seem to recall that affecting something with the transmission.
    It is working. If any light has an anomaly, it's the right turn signal; it blinks at a faster rate than the left.

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    There are two bulbs on each side in the tail lights. One of them needs replaced.

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    Do you still have the owner manual? Follow the procedure in the manual to check fluid level. It is ok to overfill some and may help.

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    Quote Originally Posted by d-dogg-e View Post
    check fluid level.
    Where's the blinker fluid reservoir?

    1 running Ford out of 5 isn't bad, right?

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    Quote Originally Posted by dareall View Post
    have you had the car checked for the code? if so, provide the number for the code (not a description of the code) and whatever you do, DO NOT erase the code when you get it checked
    I got the CEL scanned. P0715; and by the description, same thing that caused me to swap out the speed sensor (which didn't work); Turbine/input shaft speed circuit.

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