1990 ZR1 Startup - NCRS Discussion Boards

1990 ZR1 Startup

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  • James C.
    Expired
    • November 1, 2001
    • 137
    #1

    1990 ZR1 Startup

    Is it normal for a 1990 ZR1 on startup to go to 2000 rpms for a few seconds, then drop to 1500 for a few seconds, then to normal idle speed. I have been away from these cars for a while and I want to make sure this is not hurting anything. Thanks! Jim
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    • Tom H.
      Extremely Frequent Poster
      • December 1, 1993
      • 3440
      #2
      Re: 1990 ZR1 Startup

      I've started more ZR1's than I care to count and that is the way they are !! All sounds normal to me !
      Tom Hendricks
      Proud Member NCRS #23758
      NCM Founding Member # 1143
      Corvette Department Manager and
      Specialist for 27 years at BUDS Chevrolet.
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        • Tom H.
          Extremely Frequent Poster
          • December 1, 1993
          • 3440
          #3
          Re: 1990 ZR1 Startup

          After further research, I have located a bulletin # 47-65-03 Released January of 1994. It calls for the replacement of the MEM CAL "prom". This will reduce idle fluctuation on a hot start. Sometimes a customer may notice an increase in idle speed during decel during a vehicle coast with clutch depressed.

          Might be something to look into. Sounds like yours is normal though.
          Tom Hendricks
          Proud Member NCRS #23758
          NCM Founding Member # 1143
          Corvette Department Manager and
          Specialist for 27 years at BUDS Chevrolet.
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            • Joe L.
              Beyond Control Poster
              • February 1, 1988
              • 43193
              #4
              Re: 1990 ZR1 Startup

              Tom and Jim-----

              I believe that the updated prom was GM #16163905. However, it's discontinued and I can't find any supercessive part number. Finding one might be a challenge---this was a 1990 ZR-1 only SERVICE piece.
              In Appreciation of John Hinckley
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                • James C.
                  Expired
                  • November 1, 2001
                  • 137
                  #5
                  Re: 1990 ZR1 Startup

                  Thanks! My car has the updated prom. I will sleep a little better..Jim
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                    • Verle R.
                      Extremely Frequent Poster
                      • March 1, 1989
                      • 1163
                      #6
                      Re: 1990 ZR1 Startup

                      Joe,

                      Services are available that will provide a PROM with contents to match your fondest wishes.....even if you don't need it.

                      Verle
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