Having misfire issues. What is the most trusted and recomended Vavle Cover replacement out there.

 

How do you go from having misfires to deciding the valve cover needs to be replaced?

What is the model and year of your car?

 

Codes 300,302,304,1497.very rough idle and running. Plugs are clean (no oil), oil is clean (no water), no visible oil seapage around the vc. 2008 Mini S R56

 

P1497 is an air leak downstream of the throttle. My guess is the PCV pipe that goes from the cam cover tot he manifold is cracked. They are made from cheap plastic that cracks with age.
https://www.northamericanmotoring.co...916-p1497.html

The other codes are related to mis-fires, which could be a result of the cracked PCV hose. I would replace the hose, clear the codes, and see how she runs.

Parts diagram with part number here:
https://www.realoem.com/bmw/enUS/sho...diagId=11_3915

For purchase:
https://www.ecstuning.com/Search/Sit...h/11157605186/

 

Bremmen Parts to the rescue!