Prado 90 Automatic transmission - delayed enagagement

Boian Jul 12, 2018

  1. Bob

    Bob Well-Known Member Supporter I am in ireland

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    The suction control valves are a pair, red and green. Not hugely difficult to change, but the area must be scrupulously clean. As for testing I'm not sure even a resistance test will tell you if they work properly as they can work intermittently and then cause the symptoms you describe. As for the autobox stuff, I'm in the dark, as they are witchcraft...
     
  2. Alastair II

    Alastair II New Member I am in great_britain

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    thanks.

    I had a look under the bonnet - went Hmm. I found the valves in a dirty environment! At least they're accessible at the top! I could have a go at this, it might work or I could make a big mess. I'm going to look for some help. Thanks for the pointer.
     
  3. Boian

    Boian New Member I am in bulgaria

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    One recent observation is that lag becomes greater when AC is on. Do you think that might have anything to do with the suction control valves?

    Turning of the AC makes car a bit snappier, however the problem is still there..
     
  4. Boian

    Boian New Member I am in bulgaria

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    OK. SCVs are replaced with new - case closed, Cruiser is back in the game.

    Thanks everyone for your cooperation.

    If anyone needs any information around this issue and I can help - message me.
     
    Last edited: Aug 16, 2018
  5. Bob

    Bob Well-Known Member Supporter I am in ireland

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    It's really a new lease of life.. I reckon they deteriorate slowly over time reducing performance until they start sticking. Then you get a much snappier truck after they've been changed.

    A few more of these coming to light lately as more trucks get a bit of mileage on them
     
  6. Bryan Brikauskey

    Bryan Brikauskey New Member I am in kenya

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    Well, I think the ATF to be used if Toyota ATF Type T-IV. I have suffered such a problem for a very long time up until yesterday. I've realized I have a faulty throttle body and throttle position sensor(TPS). so I adjusted the position of the TPS and refitted everything else back. I tested it but realized there is still some little lag. But when revving I could hear the turbo atleast. I then adjusted the kickdown cable with respect to the user manual. After a drive in the evening the car went a little faster than usual. Previously I've had issues with the gearbox, had it changed to 30-40LE. At some point after a short drive it could flush the O/D light. So I thought there was a solenoid problem. Turns out the problem was just adjustment of the kickdown cable. Do contact me for any more details
     
  7. BY_prado

    BY_prado New Member I am in pakistan

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    I have a similar problem with my Prodo 5door 90 series, but my problem is when I take a fresh start in the morning the gear shift's with a jerk and keep repeating every time I accelerate till such time the I have traveled 2-3 kilometers after that the shifting is smooth. It just happens on a cold start.
     
  8. Sarge001

    Sarge001 New Member

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    Was your problem solved? My automatic jerks when I hit throttle on higher speeds, when I apply the throttle, I get a huge hit from somewhere....
     
  9. Beau

    Beau Well-Known Member I am in guyana

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    Sounds like some sort of drivetrain lash ^
     
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