just had the car a week,n ive noticed on these cold mornings when i first start it up the engine knocks for about 2 seconds then goes. is this anything to worry about?. cheers for any advise, pete.ooppps forgot to say,its an sti.

 

guess its not a common problem then?.

 

Does it sound like a small hammer hitting a metal panel?
Could be anything from a loose heat shield, piston slap to bottom end bearings starting to go.
Any other rattling noises while on the move?

Nick

 

Go to the dealer armed with some possible causes and leave it there overnight so they can start it next morning.
Another possibility is the cambelt tensioner.
JohnD

 

thanks guys ,will go to the dealers next week.it only knocks for a second when first started from cold,doesnt do it for any more than 2 seconds,but sounds deep when it does do it.after the few seconds it stops,and youd be none the wiser that there was a problem, quiet as a mouse!.

 

i have had the same noise on my 03WRX from 6k to present 24k and been back to dealers but its a very difficult one to spot 2 secs and its gone till the next day.i posted on this one and the general feedback i got was it is quite common on 03/04/05 wrx's
powerman

 

brilliant powerman,i had a general feeling it wasnt much to worry about,as it goes so quickly after start up.thanks for your help,and when i go to subarus,if they do find anything,i will be sure to post up n let you know,cheers pete.