jh1

is it normal that the engine makes a knocking/tappety noise when cold, just for the 1st mile or so till warmed up? its an 04 wrx done 32k. thanks.

rabskyline

these cars are famous for it ! but usually certain ages . i know the 97-98 uk cars done it as i had one. full dealer history and mint. but still that piston slap thing that scoobies suffer. not an issue i dont think. and something to do with the pistons being smaller and not filling the bore till they warm up a little..(or something like that !)

jh1

thanks for that. Me last car was a lexus so not used to it though the exhaust note sounds nice

scoobi_angel:-)

My mates did this and it tuned out to be the cam belt tensioner!!! you could see the slack causin the wobble on the belt,worth a look!!!

st3v3

My 02 WRX does the the same for about 10mins it then goes away,usually piston slap as described,as long as it goes away its probably nothing more than this.

1168

more than likley piston slap,tho i thought it wasnt the norm with later models

StudentScooby

I thought the piston slap issue was resolved after my98!?

chocolate_o_brian

iTrader: (22)

not necessarily, ive got a my99 turbo and get it on cold mornings on my way home from work. just keep it below boost/2.5-3k revs until shes warmed up.