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Hesitation & engine light come on for a second when driving over large bumps 200 1990

posted by  CTON on  Wed Sep 24 04:54 CST 2008
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last visit: Tue Oct 14 10:35 CST 2014
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My 90 240 Wagon (which I just bought from a single owner this summer @ 256K km's) hesitates (RPMs drop quite a bit) and the check engine light flashes whenever I go over severe bumps in transit. Seems to be a loose wire somewhere which wiggles loose for only a second and then reconnects after the bump. It seems to be causing the car to go into 'limp mode' for that split second, therefore dropping engine power? It seems to happen much worse when I have a large load in the back of the wagon. I also recently added new shocks (Boge Turbo Gas) and new heavy duty springs.

Also, about a month ago, the check engine light came on and stayed on but was the result of a loose connection to the knock sensor. I haven't had a chance to check it again, but could this problem be caused by anything else?

Thanks,
Cton.








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    Hesitation & engine light come on for a second when driving over large bumps 200 1990

    uid 12839's pic
    posted by  Paul Driver of Inga on  Wed Sep 24 05:09 CST 2008
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    last visit: Sun Mar 25 16:42 CST 2012
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    You may want to check your crankcase position sensor wires its general overall condition.

    Starts when the front wheels hit or the back?

    Back wheels kind of would point you to the fuel pumps area. Front end could be anything from the contacts on the AMM to loose wiring on any number of sensors.

    Not a lot of help I know,

    Good Luck,

    Paul







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      Hesitation & engine light come on for a second when driving over large bumps 200 1990

      posted by  CTON on  Wed Sep 24 08:41 CST 2008
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      last visit: Tue Oct 14 10:35 CST 2014
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      Its somewhat hard to tell if its front or back because it happens very quickly at high speed over very jarring bumps... I think its the rear actually, but I'll start checking all the sensor leads to see if anything comes up. Good call on the fuel pump too. I'll check it as well. Any suggestions are better than none! Its nice sometimes just to know theres good folks out there taking the time to respond to my complaints. Thanks!








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        Hesitation & engine light come on for a second when driving over large bumps 200 1990

        uid 5322's pic
        posted by  alschnertz on  Fri Sep 26 10:33 CST 2008
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        last visit: Fri Oct 24 10:32 CST 2014
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        I've heard that a faulty ignition switch could do that also. The result of many years of heavy keychains dangling from the switch.

        Try jiggling the key when it is running and see if it happens.







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        Hesitation & engine light come on for a second when driving over large bumps 200 1990

        posted by  Clarmstr on  Fri Sep 26 10:07 CST 2008
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        last visit: Mon Sep 22 12:26 CST 2014
        [RELATED]

        I had a very similar problem. Turned out to be strain on the AMM harness was causing some of the contacts to short. Pulled the boot off the connector and made sure there was good seperation between the wire contacts. Good luck.

        Charles








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          Hesitation & engine light come on for a second when driving over large bumps 200 1990

          posted by  CTON on  Fri Sep 26 10:46 CST 2008
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          last visit: Tue Oct 14 10:35 CST 2014
          [RELATED]

          Thanks guys... sounds like I have a lot of wiggle testing to do! I'll find it and then repost once its fixed.

          cton.







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