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Thread: Problem with auto converter isnt locking up

  1. #1
    ckh
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    Problem with auto converter isnt locking up

    Since doing an oil change on the transmission on the week end, it has fixed the little bump I would fell when it changed gears, but now the torque converter isnt locking up? Any ideas

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  3. #2
    Patrol God taslucas's Avatar
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    What conditions are you expecting the torque converter to lock up in?
    Which engine?
    GQs have a throttle position sensor that affects when/if the torque converter locks up.
    If working properly it should only lock up when you get to around 80km/hr while under light acceleration.

    Tap, crackle, pop
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  4. #3
    Banned Bigrig's Avatar
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    Quote Originally Posted by taslucas View Post
    What conditions are you expecting the torque converter to lock up in?
    Which engine?
    GQs have a throttle position sensor that affects when/if the torque converter locks up.
    If working properly it should only lock up when you get to around 80km/hr while under light acceleration.

    Tap, crackle, pop
    X2 -Lucas and I have both well and truly been down this old path!! lol

  5. #4
    ckh
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    Quote Originally Posted by taslucas View Post
    What conditions are you expecting the torque converter to lock up in?
    Which engine?
    GQs have a throttle position sensor that affects when/if the torque converter locks up.
    If working properly it should only lock up when you get to around 80km/hr while under light acceleration.

    Tap, crackle, pop
    Sorry its a TB42 engine, replaced the fluid with dex 3 as advised, it used to lock up at arpund 85ish I'd be driving down the highway, then would notive the reve drop by 200rmp or so, last few days doing 100 its reving at 2200 to 2400RPM instead of if it locked up it would be around the 1800-1900RMP mark, at around 85-90 I can feek a shudder like its trying to lock up but then gives up after about 5-10 seconds, I have noticed I over filled the tranny, but calling local transmission places they said that wouldnt make any difference, am going to bleed some fluiud out so its right level, one trany guy with out even looking at it said due to its age it needs a rebuild 5K+

  6. #5
    Patrol God taslucas's Avatar
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    Have a look on the side of the carby, the TPS is a little black plastic box with wires going in to it. The main butterfly shaft goes into it. Check if all the wires/contacts are in good condition. The TPS has a little bit of left/right adjustment. See if it looks like it's moved.
    There are also fuses for the gearbox hiding down underneath the the other visible fuse box in the engine bay.

    5k sounds a little overpriced for a rebuild. If your in Vic, check out Wholesale Automatics, they are specialists for that gearbox and know their stuff.
    There is also a great DIY rebuild thread that NissanGQ4.2 made. If your handy with the tools you can save heaps if it needs a rebuild.
    Mine was completely rebuilt and I still had issues with the lockup converter, so yours may not need a rebuild to fix the problem.

    Tap, crackle, pop
    91 GQ Ti TB42 Wagon/Pertronix 2/Nomad Heavy Duty Auto/33"STTs/2"Springs/Uniden/Stainless Snorkel/Spotties
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    Get your forum stickers here!

  7. #6
    ckh
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    Will look for the fuses in the engine bay the only fuse I found so far was on in the cab on drivers kick panel marked a/t, it was in tact, will look for the ones in the engine bay, just took it to nissan they wanted a couple of hundred just to find the problem, took it to another auto tranny guy were I live in Ipswich QLD he said he could be the nulon additive as he said its too slippery for an auto locking torque converter, he said his price for a full rebuild if needed would be 3Kish very cloudy here at the moment will cheeck the TPS etc when there is a bit more light

  8. #7
    Banned Bigrig's Avatar
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    Quote Originally Posted by ckh View Post
    Will look for the fuses in the engine bay the only fuse I found so far was on in the cab on drivers kick panel marked a/t, it was in tact, will look for the ones in the engine bay, just took it to nissan they wanted a couple of hundred just to find the problem, took it to another auto tranny guy were I live in Ipswich QLD he said he could be the nulon additive as he said its too slippery for an auto locking torque converter, he said his price for a full rebuild if needed would be 3Kish very cloudy here at the moment will cheeck the TPS etc when there is a bit more light
    $2.5-3Kis more the money - call TransTech and have a chat to them - it could be the seal between the torque converter being perished letting fluid rush past when locked up, could be the plates in the TC itself, and could be a box rebuild ... either way, hard to diagnose without the box out ... exactly what I'm having done .. Crappy news before Xmas old mate, but the only other thing you can try is an additive called "Instant Shudder Fixx" by Dr Tranny (American, not sure where you get it here, but I'm about to start hunting also), with Lucas and Motorcraft also selling well known products ...

    I'm going to give them a go first and hopefully prevent a costly repair ...

  9. #8
    Patrol Freak lhurley's Avatar
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    I had my auto reconditioned recently, this week as a matter of fact. I had other work done and also blew up my box but for the reco alone it is $2500. I got it done at "Transmission Center" at Underwood. I was recommended them by wholesale automatics. Unfortunately after tomorrow they are closed until the 7/1/13 but you wont find many places open before then anyway.
    1999 GU DUAL FUEL 4.5 - 2" OME - 33's KM2s - SNORKEL - CUSTOM DINTS.... Goes by the name Candy (the car not me )

  10. #9
    Rotaredom NissanGQ4.2's Avatar
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    Hi mate, Cost on rebuild really depends on what they actually class as a rebuild and what there labour charges are

    You might find the cheaper mob might replace some clutch packs if worn, but the more expensive place will replace all clutch packs regardless of condition, etc....

    I would estimate I spend between 2.5 and 3 grand( including some tools ) rebuilding my RE403A auto gearbox myself in my TB4.2EFI, so add on top of that labour, you could end up closer to the 5g mark.

    All I can say is shop around and the cheapest is not always the best .............the alternative to rebuilding yourself is to buy a rebuilt transmission locally, pick up on a trailer yourself an fit it yourself that way you save a little on labour cost.
    Last edited by NissanGQ4.2; 20th December 2012 at 04:38 PM.
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  11. #10
    ckh
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    Quote Originally Posted by taslucas View Post
    Have a look on the side of the carby, the TPS is a little black plastic box with wires going in to it. The main butterfly shaft goes into it. Check if all the wires/contacts are in good condition. The TPS has a little bit of left/right adjustment. See if it looks like it's moved.
    There are also fuses for the gearbox hiding down underneath the the other visible fuse box in the engine bay.

    5k sounds a little overpriced for a rebuild. If your in Vic, check out Wholesale Automatics, they are specialists for that gearbox and know their stuff.
    There is also a great DIY rebuild thread that NissanGQ4.2 made. If your handy with the tools you can save heaps if it needs a rebuild.
    Mine was completely rebuilt and I still had issues with the lockup converter, so yours may not need a rebuild to fix the problem.

    Tap, crackle, pop
    how did/what did you do to resolve the lockup converter problem?

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