Hi my cooper have some essitation when on wot at around 2000-3000rpm since I bougth the car 2 years ago. It is a cooper s 2007. I have rebuild the engine last year and it still have this knock when hard accwleration on stock ecu programation and on my stage 2 battle dna.

Here what have been done so far

New spark plug twice
Gfb diverter valve
New piston and rod (supertech)
Walnut blast the valve twicw
The garage have confirm that my hpfp was fine and in the spec.

What I m planing to do is a OCC.

Does some of you know Mcnally catch can? It look like the rx catch can that you can plug both side of the pcv valve. Does a Catch can have been know to fix this kind of issue in the past?

Any other thing I should try?

Thank you

 

 

This is the catch can