TwinTurbo.NET: Nissan 300ZX forum - Same issue, upper plenum was replaced and idle
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Subject Same issue, upper plenum was replaced and idle
     
Posted by ttz'in (norcal) on May 15, 2015 at 5:06 PM
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In Reply To THIS makes the most sense. Especially since posted by ZTicket(Dallas) on May 14, 2015 at 12:38 PM
     
Message remained @ 1000 even after setting hard idle with yellow connector off and setting TPS.
After making sure throttle and cruise cables had some slack, backed off throttle stop screws 1/2 turn each and ECU was then able to control idle @ 750-800.
Possibly over time and miles small amount of wear on throttle body and/or plates when closed allows small amount of air to bypass.

     
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