Driveline bump in new 2.8 auto

[Lski Member Find all posts View Profile Close Lski]

So picked up my new 2016 build GXL auto last Saturday – really like it, such a step up from my previous PB Challenger. However, I did notice that it appears to have a driveline ‘bump’ on occasion. This tends to occur after driving for a while, accelerating then removing foot off the accelerator (assume in 3rd to 5th gears), it almost feels like it changes gear when foot is removed from the accelerator and gives a little ‘bump’.

I took it back to Toyota for them to test it, they plugged in a diagnostics device and went for a drive. After 20 min of driving they called me to say that it occurred when the torque converter was ‘locked up’ and when quickly removing foot from the accelerator. They have logged a report with Toyota and will advise an outcome in due course.

Interestingly though, whilst my Prado was being looked at by Toyota gave me a demo Prado (2.8) with only 700km on the clock and it also did it.. Which leads me to believe that it’s a common occurrence in the new auto Prado’s. I am not sure it can be considered a fault as its not overly harsh and doesn’t occur all the time, but it’s not exactly smooth when it happens.. The Toyota tech did say that it could be cause its so new, hopefully that is the case but I doubt it.

I wanted to get Toyota to log the issue against my vehicle incase it get worse as it goes in for suspension work, bar, snorkel and tyres next week and didn’t want Toyota to blame that!

Interested to know if others have experienced this?

[Mild7 Junior Member Find all posts View Profile Close Mild7]

I'm pretty sure mine does it too. Done around 7,000 Kms. I thought it may have been drivline backlash, but I suppose could me trans.

Ill pay more attention when I drive later today.

[mjrandom Out of control poster! Find all posts View Profile Close mjrandom]

Nooooooooooooooooo! Sounds like the same issue that was present in the 120 and earlier 150. Permanent solution is a modified tailshaft but it usually takes a few complaints to get there. Typically the service guys will clean and grease the existing tailshaft a few times then log a report and if the planets line up you get the new tailshaft and problem solved. I have had this done on my 120 and recently the 150. You can find more in here if you look for tailshaft clunk.

[Lski Member Find all posts View Profile Close Lski]

Nooooooooooooooooo! Sounds like the same issue that was present in the 120 and earlier 150. Permanent solution is a modified tailshaft but it usually takes a few complaints to get there. Typically the service guys will clean and grease the existing tailshaft a few times then log a report and if the planets line up you get the new tailshaft and problem solved. I have had this done on my 120 and recently the 150. You can find more in here if you look for tailshaft clunk.

I have read that thread and wasn't sure if it was the same thing as it doesn't do it when stopping..

[lordsword Junior Member Find all posts View Profile Close lordsword]

I've got a manual 2014 3L and it does what you're describing on occasion also.

Never does it when stopped, so different from tailshaft clunk thread. When in 3rd, 4th or 5th and foot removed from accelerating, there it is, sometimes...

[Riv39 Advanced Member Find all posts View Profile Close Riv39]

Nah doesn't sound like ye old tail shaft clunk to me. More like a down shift clunk of some sort. Maybe a firmware update is in order for the trani.

[grips Lurker Find all posts View Profile Close grips]

I've got 09 Petrol Auto that has been doing it for a couple of years. Had the tailshaft changed three times. Eventually after they couldn't fix it claimed it was an adaptive learning function of the gearbox. The clunk in mine is significant.

Toyota asked me to take it to a different dealer to have assessed again. Dealer said they would contact previous dealer and get back to me. Never did. WHen I contacted Toyota directly was told the job card was blank. Ie they had no intention of doing anything.

Was told I would get a call back. Never did. Rang again asked to escalate. Told manager would call me back. Never did. Called again. Eventually got manager to call back. He promised to follow up and call me back... never did Basically Toyota are ignoring me hoping I will go away.

It's with fair trading now and if that doesn't get a result looking at what legal action I can take.

Having it recorded early in the warranty means nothing. Toyota will fob you off until warranty expires. It's a shame otherwise a great car but the customer support and warranty is worthless.

Moral of the story is don't do what I did and be reasonable and get strung along forever and a day.

From what I've been able to discern it's most likely a problem with slack in the drive train. I've asked Toyota to test tolerances on the drive train but they refuse.

[brundah01 Junior Member Find all posts View Profile Close brundah01]

Just read this thread, IMHO may be two different issues mentioned here?


1. An older vehicle tailshaft wear issue as mentioned.

2. New vehicle maybe just the slight "thunk" when the converter lockup disengages i.e. when stationary at the lights after being above TC lockup?

Just a suggestion.

[cuda Advanced Member Find all posts View Profile Close cuda]

Went for 1000km service and complained of the same issue. After some investigating they came back with the tail shaft was dry and no lube. Must say it seems to be driving far better now will see if it continues. It occured when down shifting in the auto or even sometimes when the converter locked. They did apologize saying it should have come from the factory lubed. Dont know if it was just me but seems like the fuel consumption is also a little better. Managed 7.3l /100km while doing a 100km/h on the freeway after lubing.

[digys Junior Member Find all posts View Profile Close digys]

I've got a manual 2014 3L and it does what you're describing on occasion also.

Never does it when stopped, so different from tailshaft clunk thread. When in 3rd, 4th or 5th and foot removed from accelerating, there it is, sometimes...

I have a 6 week old 2.8 auto that does this sometimes. It only happens under acceleration form 1 to 2 or 2 to 3 if i suddenly let go of the accelarator just before it gets a chance to change cogs.

[Guest Close Guest]

Not a dry driveshaft slip yoke, is it?

[raydes Advanced Member Find all posts View Profile Close raydes]

Put some grease in the driveshafts, makes sure all are done, if the noise goes you know its the drive shaft. I believe when toyota build the drive shafts they put a small amount of grease on the parts for assembly only, the dealer should grease the joints before delivery , I dont think they do thats why so many have problems with the drive shafts.

[grips Lurker Find all posts View Profile Close grips]

It's not the tail shaft issue. That happens when the car is stopped. I've had the tailshaft replaced multiple times and greased more times than I can remember. Fixed the problem for about 20km before it returned.

[RyanIAm Junior Member Find all posts View Profile Close RyanIAm]

Mine is in for 10K service today and i've asked my dealer to have a look. I described it as a slight flaring on downshift. We will see what they find.

[grips Lurker Find all posts View Profile Close grips]

Had a re read. The issue I am having is when you go to reapply accelerator. Different issue. My mistake.