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Thread: Surge in revs before gear change

  1. #1
    Join Date
    Dec 2009
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    Surge in revs before gear change

    Hi I have a 99 TD5 Auto that has suddenly started a short sharp increase in revs just before or as a gear change occurs - most noticeably between 2nd and 3rd gears.

    I have checked auto gearbox oil level and it seems ok although I think i may change fluid and the filter shortly.
    Disconnected MAF and symptoms still there.
    No fault codes showing on Nanocom.

    Any ideas?? Car is still driveable but missing the smoothness i'm used to.

  2. #2
    Join Date
    May 2003
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    How long since the last fluid change?
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
    '16.5 RRS SDV8
    '21 to Infinity and Beyond!


    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]

  3. #3
    Join Date
    Jan 1970
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    Flaring on shifts would indicate not enough line pressure or a worn out trans.

  4. #4
    Join Date
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    Fluid was changed about 25,000kms ago according to the service book, I have only owned the vehicle for the last 10,000kms.

    I cracked the fill point on gearbox and dark red fluid seeped out, didnt have a noticeable burnt smell or anything.

    I will change out the fluid and filter and see how that goes, any recommendations for AT Fluid? Happy to spend for quality but can't afford liquid gold

    Hopefully not worn internally, it has just passed the 200,000km mark and I'm hoping its got plenty of life left in it yet!!

  5. #5
    Join Date
    Jun 2008
    Location
    Alstonville NSW
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    Look for fine metal particles on the magnet in the sump, can suggest wear. Does sound like the clutch pack to me though. Ask your local autotrans outfit what they think and what it will cost. If it is big dollars ,next contact ZF in sydney for a price on a swap over recon job, much less expensive than a rebuild at most auto shops but still big dollars.

  6. #6
    Join Date
    Jun 2008
    Location
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    PS

    If it is something like the clutch packs it may well be a couple of years before you are forced to do something about it. I think I drove another 20 000 before I did something and that was mostly so that I could feel it was not going to let me down rather than it actually going bang. Towing a van would be difficult but otherwise no big deal for quite some time. I changed the fluids a couple of times and this helped but did not eliminate it and in the end I went for an exchange unit. Had it changed over by an auto shop for me and they used synthetic ATF when it was filled.

  7. #7
    Join Date
    Sep 2007
    Location
    Canberra
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    A common fault with servics is the autos not being filled completely. Too little fluid. Not enough fluid in the box will do this. Not enough fluid will do other bad things too.

  8. #8
    Join Date
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    I'm sure theres something in The Good Oil on servicing these---
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
    '16.5 RRS SDV8
    '21 to Infinity and Beyond!


    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]

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