3.0d4D intermittent power loss under 2000rpm





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  1. #1
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    Default 3.0d4D intermittent power loss under 2000rpm

    I just got my Hilux back from her 200k service (Dealer service) and have noticed that when engine is at temperature but not always there is absolutely no power under 2000 rpm, when it hits the 2000 mark normal power delivery kicks in with a bang and power delivery is constant and normal throughout the rest of the rev range.

    Any ideas of what the problem could be?

    Cat is removed, Dastek chip installed for the last 4 years. Other than that engine is untouched.
    If Force is not the solution, not enough of it was applied....

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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    Ring actuator on turbo, adjusting the vanes, is sticky or worn.

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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    Quote Originally Posted by Jack Russell View Post
    Ring actuator on turbo, adjusting the vanes, is sticky or worn.
    Thanks. Sounds expensive....

    Would this only be an issue when the engine is at operating temp?
    If Force is not the solution, not enough of it was applied....

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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    it can be a piece of soot causing it

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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    "Dastek chip installed for the last 4 years." start here. I have a feeling they've changed the factory map and the Dastek doesn't like it.
    2012 Jeep Sahara Unlimited 3.6 V6
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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    Did the lack of power exist before the service, or was it a sudden change after picking it up from the workshop?

    In order of most likely faults, I would check:
    1. Dasktek chip: unplug it and see whether problem persists,
    2. Turbo: scenario JR described is plausible and would explain why power change is linked to RPM.
    3. EGR: EGR valve stuck open will over saturate intake air with hot exhaust gas during a REV range when the ECU expects it to be closed.


    Tricky to explain though why taking it for a service would result in such a sudden change in conditions.

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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    Quote Originally Posted by TwoStroke View Post
    Did the lack of power exist before the service, or was it a sudden change after picking it up from the workshop?

    In order of most likely faults, I would check:
    1. Dasktek chip: unplug it and see whether problem persists,
    2. Turbo: scenario JR described is plausible and would explain why power change is linked to RPM.
    3. EGR: EGR valve stuck open will over saturate intake air with hot exhaust gas during a REV range when the ECU expects it to be closed.


    Tricky to explain though why taking it for a service would result in such a sudden change in conditions.
    I only experienced it after the service. So sudden change after picking it up...

    Unfortunately I cannot unplug as the chip is soldered into the wiring so will have to take it in for them to check I suppose.

    When accelerating in say 3rd gear from 1000rpm, no power with foot floored and I can feel little split second bursts of power as the revs climb, then from just below 2000rpm all is normal.

    Thanks for the replies so far. I will take it in to the dealers and try to find out if they have any ideas or have a look to see if they can find anything wrong.

    No issues with fuel consumption or smoking, that makes me think the turbo is doing something funky but it sounds like it does spool...
    If Force is not the solution, not enough of it was applied....

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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    Quote Originally Posted by jelo View Post
    "Dastek chip installed for the last 4 years." start here. I have a feeling they've changed the factory map and the Dastek doesn't like it.

    Is it a standard thing to mess around with the mapping in major services?
    If Force is not the solution, not enough of it was applied....

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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    Quote Originally Posted by Pietsweis View Post
    Is it a standard thing to mess around with the mapping in major services?
    I stand to be corrected, but no, not that I'm aware of. You'll be surprised how little work gets done at a service - they drain oil, fit a new filter or two, grease a few nipples, check the wear&tear items, give it a wash and park it waiting for collection. Having gone through many weeks of painful troubleshooting power loss at Toyota shortly after buying my Fortuner, and leaving it there more times than I could count, not once did they ever allude to checking the ECU mapping or tuning. Most electronic contact they had with the vehicle was to plug it into the Techstream diagnostic to prove to me that my very dead injectors were supposedly still in good condition.

    Furthermore, I've always understood that the Toyota ECU is hardcoded with it's engine management mapping, and that it cannot be custom tuned. If it could be tuned, then why would there be a market for performance chips? We'd all simply have our standard ECU's remapped with a performance configuration.

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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    Oh another component you can check is the airflow sensor in the air intake housing. Located just downstream of the large round airfilter box and on upper side of air duct. Remove the two small screws, unplug the connector and pull out the sensor. Check that it's nice and clean i.e. no packed on dust or dirt. If it is dirty, give it a blast of some aerosol parts of brake cleaner. Leave to dry and refit.

    Unlikely to be the problem part, but worth a check seeing how easily it's done.

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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    Regarding the ring actuator on the turbo, can that be cleaned?

    About the air sensor/maf sensor, do not just use any cleaner on it. They are very sensitive. Midas or similar sell a throttle body cleaner which states on the can "sensor safe" or something along those lines.
    Rather use that.

    The sensor works by heating a tiny element and the change in temp as air passes gives a reading. Over time dirt builds up on the element and it gives false readings. That element is fragile. Do not clean with a cloth or anything. Also, unplug the sensor before trying to fiddle with it.
    Its not about how fast you are but about how quick you get there...


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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    check if they replaced the diesel filter? Perhaps if they did they never locked the plastic ring on the filter housing all the way down?

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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    Did you ever resolve this problem? My bakkie is doing the same thing.

    MAF sensor is clean, new diesel filter, EGR valve was cleaned 40 000 kms ago. Vehicle is on 160 000 kms.

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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    Quote Originally Posted by Jonny View Post
    Did you ever resolve this problem? My bakkie is doing the same thing.

    MAF sensor is clean, new diesel filter, EGR valve was cleaned 40 000 kms ago. Vehicle is on 160 000 kms.

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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    Hi was this ever resolved? I have similar problem even replaced intercooler but still same?

  16. #16
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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    I had the same issue on my bakkie. I had the turbo overhauled and the stepper motor replaced, but the issue persisted. At the same time I also experienced a starting problem where the starter motor would drag when the engine was hot (eg. after driving on the freeway). I had the starter overhauled as well and now everything is back to normal.

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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    I never found a cause for the problem but it went away by itself.
    Magically...

    Have not had any issues for 3 years now. Weird
    If Force is not the solution, not enough of it was applied....

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    Default Re: 3.0d4D intermittent power loss under 2000rpm

    Quote Originally Posted by Jonny View Post
    I had the same issue on my bakkie. I had the turbo overhauled and the stepper motor replaced, but the issue persisted. At the same time I also experienced a starting problem where the starter motor would drag when the engine was hot (eg. after driving on the freeway). I had the starter overhauled as well and now everything is back to normal.

    Yip, they like to blame the turbo and stepper motor.

    Mine turned out to be the crank position sensor.
    Everything is a hammer.
    Unless it is a screw driver.

    Then it it a chisel.

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