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91 740 Turbo Mysterious O/D Trouble 700

posted by  joe volvo on  Fri May 9 03:00 CST 2008
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last visit: Thu Apr 18 05:58 CST 2013
[RELATED]

It's not the relay. I replaced the relay 6 months ago, and the O/D was fine. All of a suddem, the car will not shift into the O/D gear at highway speed. I tried clicking the O/D switch, and although the shift-up light comes goes on and off every time I click the button on the shifter, there is no response by the tranny. Then the other day, while driving around 60MPH it mysteriously shifted into the O/D gear, and engine revs went down from 3100 - 2500 (normal O/D range). The kickdown cable seems okay, but hard to judge.







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    91 740 Turbo Mysterious O/D Trouble 700

    uid 55's pic
    posted by  john sargent on  Fri May 9 07:47 CST 2008
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    last visit: Wed Oct 22 09:07 CST 2014
    [RELATED]

    It is probably the overdrive solenoid in the transmission. I had one fail earlier this year. A used solenoid made it shift fine into overdrive.
    --
    john








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      91 740 Turbo Mysterious O/D Trouble 700

      posted by  joe volvo on  Fri May 9 09:46 CST 2008
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      Thanks for the thought. The minute I hit the post button, I looked at a parts web-site, and there was a solenoid for $150.00. I am assuming that the solenoid is the problem as well.








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        91 740 Turbo Mysterious O/D Trouble 700

        posted by  rstarkie on  Fri May 9 10:25 CST 2008
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        last visit: Fri Oct 24 10:14 CST 2014
        [RELATED]

        It would be a good idea to check if the circuit is delivering 12v to the solenoid when you activate the relay. There could be a wiring problem that would be cheap fix rather than a bad solenoid.

        Randy







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