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Thread: Overdrive issues

  1. #121
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    Re: Overdrive issues

    Itís the Volvo 240 OD valve. If you google it youíll see itís very similar to the one we have.

    The old OD needs to be sliced into the wiring since it does not share the same plug.


    https://www.ebay.com/itm/VOLVO-Auto-...cAAOSwEgVWR4Q0


    And the Bypass plug to cancel out the Od

    https://www.amazon.com/Overdrive-Sol.../dp/B00VET3N50

  2. #122
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    Re: Overdrive issues

    Also, try looking at post #107 on page 6 of this thread.

  3. #123
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    Re: Overdrive issues

    Thanks Timberland

    The link Timberland posted show cheaper OD solenoids

  4. #124
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    Re: Overdrive issues

    If you never turn off your OD and you want a permanent solution, then I'd go with the bypass device. Tim

  5. #125
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    Re: Overdrive issues

    Quote Originally Posted by timsrv View Post
    Check out post #25, page 2 of this thread.
    Thanks Tim-o

  6. #126
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    Re: Overdrive issues

    Has anyone here actually installed the Volvo bypass plug?

    My '85 2wd isn't getting overdrive, and I tried to look at the wiring, but... The wiring around the overdrive relay is in a rather sorry state, and the wire count/colors do not match what should be there according to the diagrams and photos in this thread. Previous owner seems to have done something strange. Yes, I have unplugged the coolant sensor. It didn't help.

    Instead of messing around with the wiring any further, I'm curious about the behavior of that plug. The ebay description seems to say that it locks the vehicle out of overdrive? Of course, that is for the intended volvo, so I want to confirm with you guys what the real behavior is in a toyota. For those of you that have installed it, does it permanently enable or disable the overdrive?

    Where I live, I need to be able to drive at least 60mph to get nearly anywhere, and doing that without overdrive isn't good for my fuel economy or my peace of mind with a 36 year old engine. The overdrive needs to work. Thanks for the help.

  7. #127
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    Re: Overdrive issues

    I installed it on my '85. My overdrive solenoid was getting voltage when it should and when I removed it and tested it with a battery, it opened fine, but when it was installed and I was driving on the highway, the trans wouldn't shift to 4th gear. In hindsight maybe the orifice in the solenoid was plugged? Anyway, I installed the Volvo bypass plate. At first it leaked since the supplied o-ring was too thin for the groove in the plate. I replaced it with a thicker o-ring and it stopped leaking. As for how it works, it works fine. The trans shifts in and out of overdrive at about 70 or so km/hr like it should. As for the "overdrive" terminology, some people say when it's engaged the overdrive is "on". Others say when it is disengaged, overdrive is on since you get more power going up hills in only 3rd gear. Anyway, if I want more power to accelerate up a steep hill, I just press down harder on the accelerator and the trans kicks back to 3rd like it should. Personally I don't see the point of the selectable overdrive switch in the first place.

  8. #128
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    Re: Overdrive issues

    Great, I'll order one! As long as I get normal use of all the gears, I don't care about losing the ability to "turn off" overdrive... It's a silly feature anyways. My Tundra has it too, cant find a good use for it at all, unless maybe I was towing something heavy up a hill. And I have no plans to do that with a 90hp Van

  9. #129
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    Re: Overdrive issues

    Quote Originally Posted by Floridaman View Post
    unless maybe I was towing something heavy up a hill.
    This is one of the purposes as well as reduced load and wear on the transmission and engine at lower speeds. If a gasoline engine is constantly operating at or under 1500-2000 rpms say at 25-35 mph you are lugging the engine when you try to accelerate which can actually harm it. By pressing the throttle harder you get it to downshift but that causes the transmission to shift up and down frequently when traveling at slower speeds increasing wear on it. By being able to lock out 4th gear at slower speeds you are able to keep you engine rpms in a more useable range and the transmission doesn't need to frequently shift up and down. Of course if you live somewhere largely flat this is not as much of an issue but I live in the PNW where nothing is flat and a 1.3 mile run to the grocery store involves 3 hills. Mine stays locked out unless I know I'm going to be sustaining 40mph or more. The whole point of selectable gearing is to keep the engine rpms at a usable compromise between economy and power. Contrary to reasonable logic, maximum economy is not necessarily at the lowest rpm possible. Of course, there is a massive number of variables for these circumstances as well.

  10. #130
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    Re: Overdrive issues

    Put my volvo "fake solenoid" in today. Happy to report it works perfectly! I'm now getting all 4 gears and the van can happily cruise along at 65+mph without excessive engine rpm. I don't know exactly what RPM I'm getting, as my van does not have a tachometer, but it's still a night and day difference.

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