[Mk2] [NA] Major problem!! SOLVED!! Captive nut on rear sub-frame

[Snakebitey2]

rite then i shall try to explain whats happening

everytime i go around a left hand bend the right side of the car feels like it drops down kinda like a normal weight transfer but then it kinda locks into place. when i straighten up again it literally springs back up again.
sometimes when i take a left it just does this then starts bouncing then springs up agen when i straighten up.
and recently it will happen in a straight line after giving it some in 2nd or 3rd gear to lets say 5000 rpm as soon as i back off the throttle the exact same thing happens it just springs up but this effect only happens after ive taken a left hand bend.
whatever is causing this needs to be stopped as it has nearly killed me on more than 1 occassion and it is totally undrivable.
it feels more like it is happening at the rear of the car.
all right turns are perfect!!!
EDIT: car hardly even bounces anymore it just throws my car off course still only on left bends

ive spent far too much money trying to fix this i need to fix this now or my beautiful mister 2 will be seeing a new owner (which is the last thing i want).
springs and dampers have already been replaced with spax psx kit.
poly bushes replaced on most parts
all bolts and nuts checked and tightened.
wheel been off far too many times incase i missed something
ive pretty much run out of idea's

so anyone out there who has had this problem before or has a decent idea of what the problem mite be please shed some light on this situation.
ANY HELP WILL BE GREATLY APPRICIATED.

i am currently trying to get vids of all 4 wheel stations of the car (from underneath) to see if this gives any answers.


EDIT: right had enuf of this problem nobody can work it out. it has to go or its gonna kill anyone who gets behind the wheel of it so: £10 VIA PAYPAL TO THE SOLE PERSON WHO GIVES ME THE CORRECT SOLUTION TO THIS PROBLEM. cant say any fairer than that eh

BTW I WILL NOT PAY OUT TIL THE PROBLEM IS SORTED AND GOES TO THE FIRST PERSON TO GIVE ME THE CORRECT SOLUTION.


EDIT 2: PROBLEM SOLVED, WAS THE CAPTIVE NUT ON THE INSIDE OF THE SUM FRAME. WILL POST PICS SOON

[SwissHeavy]

Hmmm things that pop into my head:

Top mounts need checking
Ball joints
Drop links / arbs / arb mounts
Wheel alignment.

Might be some ideas, others might be able to come up with more sound thought...

[Martin F]

its nothing much by the sounds of it but very hard to determine over the Internet. you need to take someone for a drive and get their opinion...hit a garage around lunchtime and offer one of the lads a tenner and take him for a wee drive...he will diagnose the fault within no time...

[2Crooky]

leaking shocks?????

You may have had leaking shocks for a long while so they are dried up and pooped... Sounds like the shock is depressing but then not releasing back again due to lack of free play...

Very odd!!

[Snakebitey2]

leaking shocks?????

You may have had leaking shocks for a long while so they are dried up and pooped... Sounds like the shock is depressing but then not releasing back again due to lack of free play...

Very odd!!

Nah they were my first thought, shocks and springs are brand new.

[Blue_5]

Did it do this before the shocks and springs were replaced?

[Snakebitey2]

yea this is the reason i changed them thinkin it was knackered shocks so replaced it with a spax psx kit and it made no difference at all

[jmachling]

Any other noises to go with the problem?

CV joint perhaps? It'll compress when the suspension is under compression but I'd have thought you'd hear some pretty nasty grinding if that was knackered.

Is there any visible signs of anything rubbing/catching on anything (ARBs and springs specifically)?

[Snakebitey2]

nah defo no noises although i have noticed recentlty the the rear alignment is out by quite a lot after my tyres were extremely worn on the insides. its a possibility but i wouldnt thought the alignment would make the car this bad lol.

[Snakebitey2]

BUMP

[JeffD]

Rather than driving it have you tried jacking both wheels up off floor and studying all the afortementioned components whilst a friends turns the steering wheel? Get it on axle stands like pic below so you crawl undreneath. Also check your topmount bearings are moving properly :-)

[Snakebitey2]

yea far too many times lol the problem is absolutly nothing seems out of place at all strange

[JeffD]

If you can get either something like breeze blocks or a pit erepeat the test with load on the wheels.

Can I just confirm that when you turn LEFT its the RIGHT hand side that drops?

[Snakebitey2]

just been lookin at a vid ive made of the rear right wheel from underneath the car whilst going around a series of bends i will post the vid here but im suprised the tyre is still on the wheel lol vids to follow.

[Blue_5]

When the car is on the ground, how close is the wheel to the suspension? If you have a lot of wear on the inside of the tyre, my thought would be that the tyre is making contact somewhere and upsetting the suspension.

[Snakebitey2]

it is a standard size wheel and tyre 15's so the wheel to suspension clearance is plentiful.

[Snakebitey2]

If you can get either something like breeze blocks or a pit erepeat the test with load on the wheels.

Can I just confirm that when you turn LEFT its the RIGHT hand side that drops?

That is correct

[RST]

leaking shocks?????

You may have had leaking shocks for a long while so they are dried up and pooped... Sounds like the shock is depressing but then not releasing back again due to lack of free play...

Very odd!!

EDIT: car hardly even bounces anymore it just throws my car off course still only on left bends

I'd have thought it was a problem with suspension. Only thing I can think of because: Same year, revision, similar suspension mods and even colour (aquamarine acc. to pics in your garage)! I went for aftermarket shocks and lowering springs initially on mine with stock wheels and tyre sizes (though no PU bushes), and it was truly, truly awful -rolled round corners wrong and never really rode out bumps. Everything was de-tuned with the stock wheels / tyre sizes. I might be totally out but it sounds spookily familiar reading this, particularly with left corners as the weight was usually on the rhs with me driving.

...Probably not the cause at the end of the day -but for me, it does sound very similar to an old problem I had.

[going4the1]

You will probably find that it is the captive nut inside the rear sub-frame which has failed.

This link will assist. There is a photo by poohbear which points out where you need to look.

http://mr2oc.co.uk/ForumsPro/viewtopic/ ... ptive.html

When do I get my £10 again??

[Snakebitey2]

You will probably find that it is the captive nut inside the rear sub-frame which has failed.

Have already changed the front buses for poly ones never thought to check the rear, duh lol.

This looks convincing will be checking this out asap, not now tho, too dark lol.