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90 Series Prado - Loss of power under load.

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  • Pauls 95
    replied
    Mines the same, brilliant around town but out on the highway and hit a hill and it dies. Everything's been replaced. Last thing I need to check is fuel pressures, both tanks do it though so I doubt that's it.

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  • ozprado55
    replied
    Hi All

    Has anyone been able to track this problem down to a specific issue?

    I've got the same problem in a 99 Prado 210k on the clock.

    car almost dies to a crawl under load/ Towing or on a hill incline. straight surface no issue.

    Can the ERG Value be a culprit ?

    Leave a comment:


  • RedAdventureWagon
    replied
    I had the same issue especially whilst towing a 1 ton camper trailer with overdrive off. Heard this could be caused amongst other things by a dirty MAF sensor. I was sceptical but picked up a can. Tried it and seems to have made a fair improvement in my 381,000km 2000 VZJ95R. Improved low speed acceleration mainly.

    Also tried it in my 110,000 km 2010 atmo petrol car (Mitsubishi 4B11) but it seemed to make no noticable difference there.

    Leave a comment:


  • Irish Ian
    replied
    I have the same issue but when I put it in cruise control the issue goes away and the car drops gears no problem going up hill to
    produce the right power for the hill

    Leave a comment:


  • Chris7600
    replied
    HI Sweno
    You have described my experience of last few months perfectly. Towing a one tonne camper trailer, it does not want to go up hills - slows to a crawl - 1st gear on steeper ones. Mines a 2002 Prado advantage 3.4 auto. Delivers 18-20lt/100 km with trailer and best normal light running without trailer delivers 15lt/100km. No knocks, no rough running, timebelt within service interval - tried all fuel types, injector cleaner, changed spark plugs, changed air flow sensor, cleaned air cleaner. Gave up and took it to Toyota. - Compression fine, all diagnostics OK, problem not found $260 please.

    The car used to consistently deliver 11.5 to 12.5lt/100km heavily loaded.

    I've checked brakes and bearings for temperature - all cool including trailer - checked tyre pressures - need to check wheel alignment. But I cant escape fact -- unexplained engine power loss.

    The idea that fuel might be being starved (per a comment above) is interesting.

    Did you eventually find answer?

    Cheers
    Chris

    Leave a comment:


  • RobboMC
    replied
    Many years ago I had a somewhat similar problem with a non-Toyota car. It would go beautifully for hundreds of flat km,
    then suddenly the power would just disappear, and it would limp along, usually on a hill. It turned out to be a kinked fuel line.

    So check around near the fuel filter, someone may have changed the filter and twisted up one of the lines.
    It's a long shot, but this sounds like it could be a similar fuel supply issue to me.

    One test would be to fill the fuel tank completely full. If it happens less on a full tank then it could be this.

    Leave a comment:


  • StrangerD
    replied
    Originally posted by RanJ View Post
    Finding one from a Prado may make things difficult... looking for one from a Hilux will be easier
    Are they the same?
    As my prado is Auto with cruise control?

    Leave a comment:


  • RanJ
    replied
    Finding one from a Prado may make things difficult... looking for one from a Hilux will be easier

    Leave a comment:


  • StrangerD
    replied
    Wow,
    I just had this happen to me today as well. I got a engine light on and it throws error for throttle body. So i am in a hunt for one. So bloody hard to find one here in Sydney.
    I hope a good night rest will help me get the car back to Sydney tomorrow from Newcastle 😐

    Leave a comment:


  • Leethal
    replied
    Double post
    Last edited by Leethal; 14-11-2017, 10:57 AM. Reason: Double post

    Leave a comment:


  • Leethal
    replied
    I suggest doing the simple things first, you have not mentioned any missing or a misfire just not a lot of power.
    I would replace the main fuel filter first, the one forward of the sub tank. I doubt it is the fuel pumps as to have both in-tank pumps with the same issue at the same time would be rare. If this filter is blocked it will limit the amount of power you can produce, as it is fine on the flat but cannot maintain speed when more power (fuel) is required. This would not set an fault code.
    As it runs fine on the flat I assume it revs over 2500rpm which indicates electrically it is ok. How does it go on hard acceleration from stationary?
    Does sit break down/miss at high rpm through the gears? Does it rev out in first & second okay but not third etc.

    Lee
    Last edited by Leethal; 14-11-2017, 10:56 AM. Reason: double post

    Leave a comment:


  • RanJ
    replied
    When the power loss happens, is it sudden or gradual?
    Does the check engine light ever illuminate?
    What about when you turn the ignition on before starting?
    Does it come and then go off again a few moments after starting?
    When was the last time the timing belt was changed? Hopefully it’ll be written in the book or there’ll be a small sticker in the engine bay somewhere.

    If it’s rev limited to 2500rpm and just will not go past it... it sounds like the knock sensors are detecting pinging and retarding the timing under extreme load. It that SHOULD illuminate the engine light if it limits you to 2500 rpm.

    Leave a comment:


  • Brett1979
    replied
    You'll have to let us know of what the issue was when you get it fixed. Before mine was fixed the best I could hope for was 60km/h in 2nd and only pressing the accelerator as much as I absolutely needed to in order to get to and keep the car at that speed. The motor just lacked any form of power whatsoever until near the top of the range. Gets embarrassing when trucks are overtaking you on the way up haha.

    Leave a comment:


  • Sweno
    replied
    I went and had another drive up that long slow hill this afternoon. Changed my driving style, no cruise control, power button depressed, and less throttle..... much better, I mean not brilliant, but distinctly better.

    Goes to my mechanic tomorrow for him to have a poke about.

    Leave a comment:


  • Tonz
    replied
    I think its a good start checking out that airflow sensor, also the oil of the trans,
    did it smell of burning at any stage, if not i would think towards electronics.

    Leave a comment:

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