rear suspension banging help

[adamuk14]

hi all newbie here.

i got a 2006 vectra club lpg/petrol

i get a knock/ bang coming from the rear drivers side of the car when i go over a bump,
it is only on this side and when im on a flat road it doesnt happen.

not very mechanically minded but i always try and fix things myself to keep the cost down.

is there any bushes that might be worn etc?

thanks in advance

[Caveman_nige]

sounds like the upper arms are knackered, cheap enough to buy but not fund to fit, i paid a bloke £80 to fit mine, the arms cost about £40

[adamuk14]

cheers mate
will both sides need to be done as the knock is only one side?
and will it need doing soon
it has just had all 4 springs done for the mot and i thought the knocking noise was that but it is still there.

[Caveman_nige]

its best to do both sides to balance the car properly.. its worth checking your ARBs (anti tool bar bushes) as well while there at it..

[adamuk14]

cheers nige,
cant believe all the springs needed doing as the cars only done 59k
i went for a cheaper option of buying from ebay they came off a 2008 sri so they will be a little lower than my standard club springs, hope they last a little longer.

[Caveman_nige]

lol factory springs are known to break mate, most of us replace them with something better for roughly the same price or cheaper than a dealer replacement spring set..

[adamuk14]

luckily they were only £30 not sure what my mates going to charge tho for fitting them tho.
if they go again i think ill go for lowering springs since reading a few discussions on this problem.

[skidmark1]

my rear knocking noise turned out to be the shock itself, found out after fitting driver side upper control arm

[Caveman_nige]

i did all my springs and shocks in an afternoon having never done them before.. a pro can do them all in a few hours or less.