tony1979

The only reason I'm posting this as a new thread is whenever I search for the problem I'm having, it seems to relate to a common problem with STI's (my car is a UK Impreza Turbo MY98). I don't want to have to fork out a lot of money only to find that it doesn't solve the problem.

The sound coming from the rear of the car (regardless of speed/type of road) sounds like either the boot catch/spoiler/exhaust is slightly loose. It's a knocking sound that vibrates on hitting the slightest bump in the road and it's getting worse. Although I think it might be the rear shocks (there is a slight misting of oil apparently), the source of the noise can't be isolated. The handling doesn't seem to be affected (not that I notice), but, as you can imagine, it's driving me up the wall. Any ideas, or someone with a similar problem with a non-STI model, I'd be glad to hear from you.

Thanks all!

IN THE STICKS

I know it sounds silly but have you checked to see if the jack is fitted secure ,as it's easy to forget if it's tucked away in it's litte cubby hole

tony1979

Not silly at all. Yes, I did check, including all the boot lining fittings, spare tyre and any other visible catches.

rtm4676

Snap, my cars doing the same, Im guessing it could be the top mount, Ivee checked the spoiler bolts and the boots empty (not even the space saver) fooked if I know but I need to find out.

Auto_Sparky_WRX

my bugeye knocks on the rear passenger side , apparently its a rubber bush on the top of the shock that wears??? mine seems to be worse on cold mornings, dunno if that will help?

deangtiuk

iTrader: (3)

Lads If you lift the car up on the rear there is rear diff support beam goes from O/S to N/S, I think there are 3 bolts through it into the floor 1x16mm that goes through the bush and 2x14mm, if the car has been jacked up on this the plate that fits before the bolts bends very slightly and then causes a dull knocking noise.
Took me 3 months to work out.

http://www.powerengineering.co.uk/ac..._Powerflex.jpg

It is number 8 on the picture.
Dean.

rtm4676

Im not sure where to start, I was thinking about taking my back seats out and letting the garage check all they need to, at least they will be able to get at the rear mount for a look. I will jack the car up tonight when I get here in the gargage for a look, am I the only one that has a look under the car and everything always look ok

dunx

iTrader: (3)

Mine's always dirty, and that doesn't help....

Mine knocks when "launching", as stated above there is a kit to quieten it down.

dunx

tony1979

Thanks for all the input. I'll get it checked out.

NAY93WRX

iTrader: (3)

I had the same on my RA, it was the ARB droplinks.

I changed them and hey presto!

Mccwrx

hi, try shock top mounts at rear,the 10p washer usually snaps and goes missing or the mounts wear both reveal themselves with a tapping metallic knock or arb links

rtm4676

check the boot lid, bet you havent hear that one, my one was chattering away good o'

Scar70

might be worth checking the rear trailing arm front bush. Just changed on my MY01 what a differance no knocks

99greenwagon

iTrader: (39)

sounds like rear anti roll bar link bushes,had exactly those symptoms on mine,i thought it was shocks etc,etc,etc.