Astra mk4 hatch funny knock noise

Hi,

On me Astra at slow speeds i.e 5 mph I hear occasionally a knocking noise
which goes once I accelerate. Its difficult sometimes to make it do it on
purpose and it would seem once the car has warmed up its ok. Sounds like its
on the drivers side but cant be sure.

Anyone else had this?

Cheers

Matt

 

Matthew Moore wrote in message

Have you checked the condition of your exhaust and mountings ?
--Ikie

 

Have you checked that the bracket that holds the front pipe hasn't broken or
come loose. These are a big MOT failure.

Bill

 

Hmm well the car is under Network Q warranty although ive taken it back that
many times to the vauxhall garage for different things ive lost count.

Matt

 

Could be something simple like a stone in the tyre.'

 

Ive noticed it only does it from cold, seems to go away after 5 minutes.

Matt

 

Piston slap?

 

Yeah could be thats what it sounds like. Im takin it to the garage tomorrow
so they can break it some more

Matt