Lets Play: Guess that knocking sound !

[chris_boyle33]

i'm not sure how well a forum can diagnose a knocking sound but here goes:

its coming from the passenger-side rear of the car.
it seems to be coming from the wheel arch / suspension / driveshaft area.
its a knocking rather than a rattle etc.
it doesn't dissapear when braking. (presumably not brakes?)
it doesn't dissapear when rolling in neutral (not drivetrain?)
it doesn't change tone or anything when in neutral (not drivetrain?)
it can't be simulated by bouncing on the back of the car when stationary (not suspension???)
the wheel-hub seems fine (the back wheel is firm and secure when grabbed, pulled and yarked).
it happens irregularly (i.e. not linked to rpm / speed)
it is linked to bumpy roads. some smooth roads seem okay.
Everything is firm when grabbed and shaken (exhaust, wheel, suspension parts etc).

any suggestions helpful or otherwise gratefully received.
If i can't find out what it is the radio still works okay. I could always just turn that up lots. [8|]

 

[Guest]

I'll put a tenner on that it is a broken drop link on your front ARB.

 

[Guest]

I'll take that tenner, and double it on being a failed CV joint.

 

[944Turbo]

regular knocking changing with road speed worse over bumps (CV joint) or random occasional knocks (something loose in the battery area or spare wheel well?)
Tony
(damn beaten to it!)
Also hatch pins if it only happens over bumps or cornering

 

[Guest]

spare wheel loose or spare wheel rubber buffer pads missing ?

 

[Mikie_gb]

If the above suggestions come to nothing then try the handbrake. My rattle at the rear on that side was the handbrake mechanism self destructing. Twice. Symptoms slightly different both times, and not a million miles away from what you discribe. If left it will destroy the entire working of the handbrake on that side, including the cable.

 

[Guest]

944 turbo beat me to it- I was going to say hatch pins. Happened on mine. Took pin off car and had broken weld sombody had badly fixed years ago. Fixed in 2 mins - 2 weeks to find!

 

[Diver944]

My tenner is on the CV joint.

Just jacking the rear wheel up and down sometimes repositions the grease and temporarily cures it []

 

[chris_boyle33]

Well that's given me a few more ideas. []

Its a loose knocking sound that doesn't change with speed or whether you're in neutral or in gear.
however the footwell has been emptied.

i'm now keen on the whole handbrake theory - got to say i didn't check that too much.

I'll check hatch pins too - i thought it might be the hatch but drove a little with the hatch open and the sound was still the same. I'll have another look.

Considering its a noise and this forum is done wholly by written text i'm quite impressed with the help. Thanks boys n girls ![]

 

[Fen]

If it doesn't change with speed then I think you can rule out all the rotational suggestions such as CV joint, handbrake etc. and focus on something loose and clunking around like the hatch pins, drop link (there are rear ones too) loose bits in the wheel well, shocks worn etc.

 

[Guest]

ORIGINAL: pikey7

I'll take that tenner, and double it on being a failed CV joint.

I accept Paypal.

 

[Guest]

ORIGINAL: flamingeye

I accept Paypal.

Me too! [] We'll see.......

 

[chris_boyle33]

Shock Absorber.

I fitted it just recently and checked it when the knocking noise started. It was fitted completely solidly and securely.

When we bounced on the back of the car there was no knocking noise. No idea why.

Took it out and drove without it - no noise.
Put it back in (with plenty coppergrease etc) and no noise

So i've still got no idea what the noise was, but at least its gone for now... []

Thanks for playing everyone and i guess that makes it a no-score-draw between Pikey and Flamingeye!

 

[Guest]

Damn. I was looking forward to a couple of extra pints this weekend!

Glad it's fixed.

 

[Fen]

ORIGINAL: Fen

If it doesn't change with speed then I think you can rule out all the rotational suggestions such as CV joint, handbrake etc. and focus on something loose and clunking around like the hatch pins, drop link (there are rear ones too) loose bits in the wheel well, shocks worn etc.

Ahem! Might I draw your attention to the above quote... []

 

[Guest]

ORIGINAL: Fen

ORIGINAL: Fen

If it doesn't change with speed then I think you can rule out all the rotational suggestions such as CV joint, handbrake etc. and focus on something loose and clunking around like the hatch pins, drop link (there are rear ones too) loose bits in the wheel well, shocks worn etc.

Ahem! Might I draw your attention to the above quote... []

......wine gums in the glovebox, or loose change or er.. a bumpy sounding thing.
Fen, that is just a long list. And you bolded that up. And not prepared to bet. It was bound to be one thing you wrote.[]

 

[Fen]

[] Absolutely I wasn't betting. Long list it might have been but it was the first time shocks had been mentioned on the thread and the first time I posted on it. Everything else in the list was (deliberately) picking the non-speed related suggestions already offered.[8D]