greekpeterfromlondon

iTrader: (2)

Hi was looking at a 95 wrx on the weekend and the owner was complaning
of a slight knock when cold but go's away when hot.
sounds to me more like a crank knock than piston slap.

my94wrx

iTrader: (4)

crank knock does not go away when hot piston slap does

merlin24

iTrader: (1)

As above - a worn big end/main bearing will stay noisy where as a piston should get quieter as it expands from cold.

Mick

greekpeterfromlondon

iTrader: (2)

It's only been doing it for about 3 to 4 weeks?

JohnD

iTrader: (5)

unfortunately, it's got to start sometime!

It'll Probably be less noticable as the weather warms up.

JohnD

greekpeterfromlondon

iTrader: (2)

The knocking go's when the engine is almost operating temp?

JohnD

iTrader: (5)

Classic piston slap behaviour.

JohnD

dj219957

my 93 wrx does this. has done since i got it. it sounds just like a big end when cold. once warm its gone and runs perfect. kinda annoying but i can live with it. must admit, if i was a prospective buyer it would put me off.

scooby-matt

iTrader: (3)

piston slap