bamf

hi i got a wrx sti on a k plate just got it drivein it 2 day and found engine seemed to be tappin after a drive for about 2 hours was ok when stared out checked oil seems ok but seems thin any ideas when u rev sometime u hear it some time u dont and when boastin its ok mmmm

scoobian

depends on the 'tap' !
could be oil pick-up which aint usually a problem
..........or could be sticky valve or bottom end - not trying to be a doom-monger

Mr_White

iTrader: (1)

Could also be the coil packs arcing, unlikely if it's something that's prominent enough to notice when you're driving though, but would be quite noticeable outside of the car to a trained ear.

merlin24

iTrader: (1)

Lazy Hydraulic lifter
Oil pump backing plate come loose
Oil thinned out/over-due for a change
Cam belt tensioner knocking

Process of elimination really.

Mick

bamf

done oil change 2 day seems to be tappin on about 3 to 4 tho revs when u rev past that the niose goes and on tick over its ok