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Thread: 2003 GU Patrol 3L Losing Power

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    Question 2003 GU Patrol 3L Losing Power

    Hi,

    I have a 2003 GU Patrol 3L Diesel,
    About a week ago when I was driving, I turned a corner and accelerated off,
    When I was in 4th or 5th gear and was at about 2500 RPM, it seemed to lose pulling power.

    I put the clutch in and revved it a bit and it seemed fine, I drove around for a while and all seemed good, but then it happened again.
    I didn't notice it again for about another week, when it happened while just accelerating up a road.
    I haven't noticed it since.

    On all cases I wasn't accelerating hard.

    My Patrol has a Dawes valve set to 15 PSI.
    The engine was reconditioned about a year and a half ago and had a new fuel pump installed.

    Does any one have any idea what could cause this?

    Thanks,

    Lucas

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    Expert Softy's Avatar
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    How much fuel was in the tank at the time?
    2003 GU SIII Auto Grenade. All the goodies.

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    lmath56 (21st May 2017)

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    SkippyGU JackCollo's Avatar
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    It's sounds it could be going into limp mode. With your Dawes valve set to 15 psi it could have just slipped over into lump mode. Did any lights on the dash board come on or not

    Any change in fuel economy?
    Currently own a ZD30 2000 GU patrol with a dead injector pump about to start a build on a TD42 motor to go in the car and basically rebuild the whole car into a machine of a rig

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    Legendary 4bye4's Avatar
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    Might sound like a silly question but was it a particularly cold day. Mine sometimes goes into limp mode on a cold morning. Only ever happens once then is ok for the feast of the day.


    Sent from my iPad using Tapatalk
    2005 GU IV ST 3.0. Snorkel. Roof rack. Awning. Spots. Welded I/C. Dual batteries & VSR. UHF. Barn door hinge extension. Roof top spot lights. Rear drawers. 2" lift. NADS. EGT and boost gauges. Trans temp and water temp gauges. Provent 200 catch can. Rear ladder


    And crawling on the planet's face, some insects called the human race. Lost in time. And lost in space... and meaning.

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    SkippyGU JackCollo's Avatar
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    4bye4 I'm with you on this mine has done the same thing a few times. Especially with the Dawes set so close to the limp mode threshold could have slipped over setting it off.
    Currently own a ZD30 2000 GU patrol with a dead injector pump about to start a build on a TD42 motor to go in the car and basically rebuild the whole car into a machine of a rig

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    Patrol God threedogs's Avatar
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    you could have a leaking intercooler ,,,is it oily if yes and will need to be changed to
    fully tigged and tested Diesel smart one ,, dont go cross country for your
    3ltr just a waste of money IMO, Money could be well spent elsewhere like a front lokker maybe
    Last edited by threedogs; 26th May 2017 at 05:22 PM.
    04 ST 3lt auto, not enough Mods to keep me happy, but getting there

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    I know every truck is different regarding limp threshold, but I would have thought 15psi on the Dawes is comfortably under limp. But I have to admit it does sound like it.
    Maybe start with the easy stuff and bring your Dawes setting down a bit more as an experiment.
    Perhaps the MAF sensor could do with a spray clean?

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    Quote Originally Posted by Softy View Post
    How much fuel was in the tank at the time?
    There was plenty of fuel in the car every time it happened.

    I replaced the air filter today and found that the old was really dirty,
    I went for a 5 hr drive tonight and it is definitely still happening.

    I was pulling a small trailer with nothing in it and it usually drove fine, but sometimes it decided that it wasn't going to go faster than 90 and the exhaust temp started to go up.
    I didn't let it get over 400 degrees.

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    Quote Originally Posted by 4bye4 View Post
    Might sound like a silly question but was it a particularly cold day. Mine sometimes goes into limp mode on a cold morning. Only ever happens once then is ok for the feast of the day.


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    No it wasn't any colder than usual, i have only noticed it after i have been driving for more than 20 min.

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    Quote Originally Posted by Daveyboyjunior View Post
    I know every truck is different regarding limp threshold, but I would have thought 15psi on the Dawes is comfortably under limp. But I have to admit it does sound like it.
    Maybe start with the easy stuff and bring your Dawes setting down a bit more as an experiment.
    Perhaps the MAF sensor could do with a spray clean?
    I have no idea how to adjust the Dawes, just adjust the screw on top?
    My mechanic said that it may be the MAF, he is going to have a look and give it a bit of a clean.
    He said he will hook up a scanner and see if there are any errors.

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