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T56 Help - No reverse when hot

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  • #16
    Originally posted by cptinjak View Post
    I build T56s and would be willing to fix it for you if you want. If it is anything like the corvettes, I would first make very very sure that the shifter alignment hasn't been thrown off somehow.

    Also, is there any reason why the PCM's VSS signal may be compromised? custom wiring, etc? The PCM needs to see a low enough Mph to allow reverse. In the corvettes, stock lockout enables at 3mph and disables at 2mph.

    Jack

    I'll keep that in mind. There is no reason the VSS signal would be compromised...I use HPTuners and log vehicle speed all the time.

    Where in GR are you located?

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    • #17
      Originally posted by 1999Black_Z28 View Post
      I'll keep that in mind. There is no reason the VSS signal would be compromised...I use HPTuners and log vehicle speed all the time.

      Where in GR are you located?
      I am in Marne.

      If you already have HPTuners, try changing the lockout enable/disable points. Try like 150 mph or 0 mph, see if that has any effect. Its a free troubleshoot if nothing else. Otherwise, you could just log VSS and see if anything funky is happening there.

      Jack
      Last edited by cptinjak; December 20th, 2012, 04:03 PM.

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      • #18
        Originally posted by cptinjak View Post
        I am in Marne.

        If you already have HPTuners, try changing the lockout enable/disable points. Try like 150 mph or 0 mph, see if that has any effect. Its a free troubleshoot if nothing else. Otherwise, you could just log VSS and see if anything funky is happening there.

        Jack
        Crazy! My wife and I just moved to Marne last year (pvt drive off 16th about 1/2 mile south of Hayes). I'm surprised we haven't crossed paths.

        I have track logs and tuning logs with VSS and nothing funky has showed up.

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        • #19
          Originally posted by 1999Black_Z28 View Post
          Crazy! My wife and I just moved to Marne last year (pvt drive off 16th about 1/2 mile south of Hayes). I'm surprised we haven't crossed paths.

          I have track logs and tuning logs with VSS and nothing funky has showed up.
          Haha that's crazy. I'm the idiot still driving the corvette this late in the year. You'll see me around. I'm actually on 24th due west of the race track.

          are those logs from a condition that caused the reverse issue? As in, was it hot enough to make it malfunction?

          Jack

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          • #20
            I'm dumb. I just realized something. In the HPT scanner, under the VCM controls, there is a manual reverse lockout on/off toggle. run the car with the scanner on and see if you can manually actuate the solenoid with this controller.

            Jack

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            • #21
              Originally posted by cptinjak View Post
              are those logs from a condition that caused the reverse issue? As in, was it hot enough to make it malfunction?

              Jack
              Yeah, it doesn't take long for it to happen. It always happens while tuning WOT and at the drag strip

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              • #22
                Dave you just need to beat on it more

                It shouldn't be clutch related since it shifts into other gears.

                My guess is the solenoid is going bad, or a wiring issue.

                I left mine unplugged once and it a b*tch to get into reverse.
                2000 Formula
                fixed slow junk

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                • #23
                  Originally posted by Nocooler View Post
                  Dave you just need to beat on it more
                  Ha....you're probably right lol.

                  I leaning torward the solenoid acting up at this point.

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