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Random overdrive shut out increasing '84 200

posted by  stevepenniman on  Mon Dec 3 21:52 CST 2012
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last visit: Tue Sep 2 14:22 CST 2014
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It started doing this about a year ago, and will come and go. The longest it's stayed "lit up" and in third gear is about 25 miles and it goes normal. Often it's just for a minute, or ten.

I had the wire from the shifter though the floor break about 9 years ago, and that's put back nicely. It's not acting like it did then with the shuddering, etc. I'll just start it up and sometimes the light is on and it won't go into fourth till it decides to for it's own reasons. Do these overdrives do this a lot when they get older?

I tow a trailer fairly often, so disabling this entirely is not an option in my case. An emergency disable I'd be interested in hearing about, if , say, I'm on a road trip or something. I'd like to just get it to stop it, of course, if I'm told what to look at.

Thanks,
Steve








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    Random overdrive shut out increasing '84 200

    posted by  Onkel Udo II on  Mon Dec 3 23:20 CST 2012
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    last visit: Fri Oct 24 08:50 CST 2014
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    Have you resoldered the relay?








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      Random overdrive shut out increasing '84 200

      posted by  sedan delivery on  Tue Dec 4 00:10 CST 2012
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      last visit: Sun Jun 15 18:52 CST 2014
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      I trouble shot my overdrive down to the relay. I would like to try to solder it. Where would I go to find out how.

      Thanks







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        Random overdrive shut out increasing '84 200

        posted by  Onkel Udo II on  Tue Dec 4 04:51 CST 2012
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        others can cover can cover this much better than I...and have. Do a search for thorough explanation but beware, resoldering the fuel pump relay is one of the most common repairs so you will get a gazillion hits so make your search specific.

        The short version is:

        Remove the cover off the relay
        Start with the big lugs and heat them with the soldering iron until the solder turns liquid (gets suddenly shiny)
        Follow the path of the original solder traces making sure not to cross them
        I rarely add solder but occasionally I will on the heavy lugs.

        For me a 35 watt iron with a pencil tip works but takes a while on the heavy lugs. It is perfect for the smaller traces. The goal is just to remove micro-cracks that are a result of years of use and a less than perfect manufacturing process.







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          Random overdrive shut out increasing '84 200

          posted by  stevepenniman on  Tue Dec 4 07:30 CST 2012
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          last visit: Tue Sep 2 14:22 CST 2014
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          This is great! I'm all over that danged relay. I've been soldering components in and out of vintage hi-fi gear almost daily, as of late. I'll search for the specifics, like where the heck is it?, etc. The symptoms seem like they match something like this as the cause.

          Thanks,
          Steve








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            Random overdrive shut out increasing '84 200

            posted by  Onkel Udo II on  Tue Dec 4 07:41 CST 2012
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            No clue where it is on an '84 but on my '90 it was behind the glove box toward the drivers side. Big white thing. Heck, just grab all the relays an do them all at once. The fuel pump relay on most cars is a common failure item (yours might be one of the rare years that just uses a generic ice-cube relay...talk about dim memories).

            If you find the relays flopping about instead of clipped somewhere, figure out a way to re-install them so the cover points up at least a little and there is a drip loop in the wiring. The 240's are notorious for windshield leaks that can fill the fuel pump relay with water.







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              Random overdrive shut out increasing '84 200 1984

              uid 27's pic
              posted by  Art Benstein on  Tue Dec 4 08:18 CST 2012
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              last visit: Fri Oct 17 20:10 CST 2014
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              On the 84, the relay (orange then) is in the same place -- just to the left of the glove box. Yes, 83/84 fuel pump and system relays are standard cube relays with nothing to resolder.

              The cracked solder generally occurs only on the large, thick pins used to mount the relay to its circuit board. The frame is the electrical connection to the moveable contact. None of the small components (resistors, transistors, IC, etc.) need resoldering, just the relay and the terminal connections.

              Here are some notes with pictures. Scroll to the end: http://cleanflametrap.com/odwire/


              --
              Art Benstein near Baltimore

              Each king in a deck of playing cards represents a great king from history: Spades - King David, Hearts - Charlemagne, Clubs-Alexander the Great, Diamonds - Julius Caesar








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                Random overdrive shut out increasing '84 200 1984

                posted by  stevepenniman on  Tue Dec 4 08:59 CST 2012
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                Great link, and excellent photos and info, Art. As usual!

                Looks like the special Swedish naturally degrading wire insulation experiment made it way down there, too. I'll see if I replaced mine all the way down to the connection. I forget.








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                  Random overdrive shut out increasing '84 200 1984

                  posted by  Onkel Udo II on  Tue Dec 4 09:02 CST 2012
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                  "Swedish naturally degrading wire insulation experiment" sadly we can't blame the Swedes for that innovation. As Jeremy Clarkson likes to say, "It was zee Germans!"








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                    Random overdrive shut out increasing '84 200 1984

                    posted by  stevepenniman on  Tue Dec 4 09:19 CST 2012
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                    last visit: Tue Sep 2 14:22 CST 2014
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                    You know, I thought I might get in trouble for that. But didn't the Swedes ask the Germans to make an eco friendly harness for them?

                    Is it in a Tolstoy novel? They ask the Russian peasant what makes the newly arrived mechanical harvester go. "It's either the Devil... or a German!"







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