Strange noises - THE RETURN

[Kaamos]

Hi all, I'm coming back here tu submit again an old issue I had with my UK spec TT, already posted a while back here :

http://www.mkivsupra.net/vbb/showthread.php?309672-strange-noises

 

then the weird noise was gone, resurfacing from time to time and going away again without any toy dealer or other mechanic being able to diagnose nor fix the problem.

But more recently the noise came back, more often and louder, until it was there all the time (a weird cracking/squealing noise, hard to define, see video below).

Took the car back to the dealer, they checked the whole rear axle again without being able to disassemble totally because of the rust as they did not want to damage anything but according to them it's not the gearbox, not the diff, not the rear axle which leaves me pretty much clueless, so I'm coming back to you.

 

The only benefit from the last time I took the car to the dealer is that the noise was there all the time and since they partially disassembled/reassembled the rear axle, now the noise goes on and off again for no reason.

What is super-weird is that the noise, now that it is sporadic again, happens most of the time when I am super gentle on the throttle or when I release it completely and not when I hit it "normally" or more in a more aggresive manner..... but sometimes it's the other way round : the noise disappears when I release the throttle(-like in the video)....... and also when I come to a halt or on the first meters when i start driving again, there's a weird clonk noise that I can feel in the driver seat.....

 

I know my decsription is lame but I have been unable to identify a cause-consequence relationship whatsoever so I'm just dropping what I have experienced....

 

Hope this rings a bell to someone.

 

https://vimeo.com/186171770

[Kaamos]

A little UP and update,

now the annoying nois seems to have stabilized in such a state that it only occurs on throttle, and also depending on steering as follow :

 

Straight line : the more throttle, the more noise, no noise when letting go unless after having driven for a while (45min+)

Right turn : noise all the time, regardless to throttle or not throttle

Left turn : hardly no noise, throttle or not

[Dnk]

That sounds horrid

 

The left turn right turn difference would lead me to look at the diff, cv joints, wheel bearings, even seized or s

eizing brake caliper/s

 

Has the diff oil been dropped into a clean container to see what that looks like.

 

How exactly have they checked the rear end and what did they check ? i'd be taking it apart personally

Edited December 4, 2016 by Dnk (see edit history)

[rider]

Could possibly be your cat breaking down.

 

Edited December 4, 2016 by rider (see edit history)

[herbiemercman]

It could be some thing in the turbo area, like a waste gate valve face bouncing, it sounds gruff and like air flow pressure turbulence. It does not sound metalic and the intermitancy sends me to some thing sticking occasionally? Be interesting to see what other members think, some of them have much more experience than i have. Good luck. Herbie.

[David P]

Did the inspection include checking the prop-shaft centre bearing?

[Pudsey]

Ticking sound on the rear is in my experience a stretched Brake shoe retaining pin.

 

The pin holds the rear brake shoes in via a spring and hat.

 

When the pin is stretched it catches on the inner hub stud heads, and the noise you hear is the rotating assembly striking the heads as it turns.

 

My very first supra had this, and that's exactly what it was for me.

 

Changed out for a new retaining stud (pin - it's got a curve in it), and problem was gone.

 

Some of your other noises may be linked to the inner Brake shoe area, as these are rarely serviced.

[Kaamos]

thank you all for your inputs,

as far as I know, here's what I can answer :

@DNK :

diff was my first guess as well so I hafd them check diff oil, and also gearbox oil just in case. I gotta check back with them but i **think** diff oil was clean, gearbox oil had some grunge and a small washer came with it, undamaged... so prolly the grunge came from the screw that retained the washer.

I don't know exactly how they checked the rear, all i know is that several shops had a look and they all said the whole rear end "seemed ok"... duh !

 

Any way upon last inspection at yet another shop they didn't wand to investigate too far since everything seemed too rusty to be taken apart safely without ruining the wheel bearing so I got a new one and I'll bring it with the car next week for them to have a closer look.

 

@rider :

I wish it were the cat, would ba an excellent excuse for an exhaust replacement/upgrade, but I don't think so.... I'mm give it a shot but I'm pretrty sure that if I have driven the car long enough for the sound to occur at it's full potential, it may even happen with engine off.

 

@Herbie:

no-one ever went that road so far since the sound clearly seems to come from the rear/rear left, at least that's my impression while sitting inside the car but maybe a weird resonance ?

 

@David P:

the whole prop shaft is said to have a little play, but nothing outrageaous and definitelky not enough for doing this.... now the center bearing, if I understand well (sorry for my english, but I'm french and I try figuring out which part is what) if it's the rubber disc in the center part yes it seems to be ok.

 

@Pudsey:

at one point I also thought this would come from the brake, maybe seized pistons or something, but "apparently" the brakes are clean, I'll have them double-check though.

[David P]

There's a bearing hiding in the centre of that rubber disc.

[Pudsey]

@Pudsey:

at one point I also thought this would come from the brake, maybe seized pistons or something, but "apparently" the brakes are clean, I'll have them double-check though.

 

Just as long as you understand i am talking about the 'hand brake shoes' shoe retaining pins, nothing to do with the caliper on the disc.

 

You will need to remove the rear caliper and disc, to do a check of the inner hand Brake shoe assembly/ mechanism.

 

Hope you manage to sort the issue.

[Dnk]

Ok so the diffs good and the brake calipers appear to be good.

 

I assume they did the simple wheel bearing check ? jack up the wheel off the ground and spin the wheel, listen for noise and also hold the wheel at 12 and 6 and rock it and at 9 and 3 to feel for play

 

An inspection of the hand brake is easy enough to do and then maybe driveshaft CV joints

[samm]

You can eliminate the handbrake by lightly pulling it on when the noise appears and if it's coming from there it should make a difference to the noise.

[Kaamos]

There's a bearing hiding in the centre of that rubber disc.

ok I'll have them double check that

 

 

I assume they did the simple wheel bearing check ? jack up the wheel off the ground and spin the wheel, listen for noise and also hold the wheel at 12 and 6 and rock it and at 9 and 3 to feel for play

 

I can't really tell, but I remember all the mechanics feeling like it does not "sound" like a worn wheel bearing, but as I wrote earlier the bearing will be replaced by a new one, be it only to stay on the safe side

 

You can eliminate the handbrake by lightly pulling it on when the noise appears and if it's coming from there it should make a difference to the noise.

I remember taking the mechanic for a drive and yess he pulled slightly the handbrake while i was driving, this made no difference for the noise.

 

Just as long as you understand i am talking about the 'hand brake shoes' shoe retaining pins, nothing to do with the caliper on the disc.

 

It may not be that, then, as we seem to have removed the handbrake from the equation... or haven't we ?

Edited December 5, 2016 by Kaamos (see edit history)

[Jellybean]

My prop centre carrier bearing that David P is talking about was proper fucked , sounded like a Clunk when letting on/off the throttle but nothing as severe as what you are hearing

 

The clicking on the rear hub , Pudsey is talking about can sometimes be down to the 'hand brake shoes' shoe retaining lower spring put in the wrong way round , it is easier to connect it up on the outward side of the hub than the correct location behind, easy mistake to make

[Kaamos]

UPDATE:

the problem seemed to come from a worn bearing/wheel hub combination.

Got both replaced but now the abs sensor (rear left) seems to have had it, and no dealer is able to get me the part here in France.... Anyone?

[David P]

There recently was a thread about this that includes a link to the ABS sensor that you need.

 

Do a search and it'll turn up.

[Kaamos]

Nobody ?

Apparently the correct name is speed sensor (rear left), part number is 89546-14010 but it seems like it has been discontinued by toyota

[David P]

There recently was a thread about this that includes a link to the ABS sensor that you need.

 

Do a search and it'll turn up.

 

[Kaamos]

Oh, somehow this did not refresh in my browser sorry, thank for your input David, I think I found the thread