I have a clack on cold start and when i drive the car, from 2500prm upwards, checked and did the following:

New oem tct that i then changed to toda with no improvement
Valve adjustment that was off a lot, but its good now
Checked the chain for stretch, it alligned perfectly on tdc
valve retainers that werent cracked

it doesnt sound like rod, it do sound like chain, possibly oil pump chain stretched?

Its an ap1 with 130k kilometres on it

 

Could you post an audio file of this noise?

Thanks!

 

This could be as simple as a bad oil filter drainback valve. Lets oil drain out of all internal passages, so on cold start, it takes a sec for oil pressure to build. So tct has no oil pressure, chain can rattle.

Easy test, does it take a sec for oil light to go out when engine started cold? That coincides with the clank? Light still on, clank, light goes out, clank stops.

Fix could be as simple as oil change. Be sure to use the correct S specific oil filter, and most importantly, torque it to specs written right on filter (its impossible to hand tighten this filter to spec).