hey all i have a 2.0l sport every time i start her up when cold theres a knocking sounds serious sounds like its comin from (looking into the bonnet) far left side / piston ? once its bout quater of the gauge warm it goes very quiet ? what ya thinks thanks

 

Piston Slap ??

 

im pretty much a novice when it comes to this kinda thing like i said it does it when cold real loud knocking then after a while stops some one said its my big end or summit :S if its piston slap is this a real big problem how much to get repaired cheers

 

A worn big end will NOT stop knocking when warm.
Piston slap is the normal cause of cold noise - most people live with it,provided its not excessive.
Forged Pistons are normally a bit slappy from cold when running larger Piston to Bore Clearances.
If in doubt - take it to the professionals for an opinion.

 

If it was a worn big end it would either knock for a few seconds whilst the oil pressure is building up and then go quite, or it'll knock all the time.

Anything other than that and its a problem elsewhere - or as above - piston slap (which as long as it doesn't use oil, and has good compression, isn't a problem).