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Eratic Idle in Park 89 760 Turbo 700 1989

posted by  Wouter2 on  Wed Oct 20 08:21 CST 2004
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With the vehicle in park the engine idles eratically from 900K to 15K back to 900 then to 15 and back to 900 again over and over. With a pinch of the Aux Air Valve House idle returns to normal.

Any suggestions?








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    Eratic Idle in Park 89 760 Turbo 700 1989

    posted by  Kaz on  Wed Oct 20 10:38 CST 2004
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    last visit: Sat Feb 23 03:37 CST 2008
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    Have you messed with the throttle body lately? I cleaned mine and had the same results with the eratic idle after. Turns out I screwed up the linkage and the throttle body switch was not seeing the car at idle. See the link below on how to make sure your throttle body valve is adjusted correctly.


    http://www.brickboard.com/FAQ/700-900/EngineFuelinjection.htm#ThrottleBodyandThrottlePositionSwitchAdjustment







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      Eratic Idle in Park 89 760 Turbo 700 1989

      posted by  Wouter2 on  Fri Oct 22 10:13 CST 2004
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      Checked that. Not messed with the throttle body. Any other suggestions as to what it might be?








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        Eratic Idle in Park 89 760 Turbo 700 1989

        posted by  ndesouza on  Fri Oct 22 10:29 CST 2004
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        last visit: Sun Mar 18 15:14 CST 2012
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        Have you checked that your ECU is seeing the TPS closing ?

        After doing that, check that your IAC (if you have one) is clean and not sticky/jammed. If you pinch one of those IAC hoses and the idle returns to normal, then I would suspect the IAC.

        Not sure what fuel-control system you have, so refer to the wiring diagrams.

        If you have an IAC, verify that the wiring to it is okay and that the insulation is not bad. The ECU controls the -ve supply to the IAC (+ve voltage gets supplied via the ignition) - so if the insulation is bad and the wiring gets grounded, you could get either a fully-open or a fully-closed IAC.

        Noel







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