Whats on the head cover

[AZ Tahoe]

Questions what is the thing sticking out of the drivers side cylinder cover? I think mine needs replaced as it makes a rattling noise

 

[SunlitComet]

if in the rear half that is pcv. when you pull it out and shake it it should rattle. if it sucks the dirty air from inside crankcase to burn in the engine.

 

[AZ Tahoe]

Gotcha and at idle in i park I can hear it vibrating / rattling very loud. I did pull it and shake it to confirm that was where the noise was coming from. Is it normal to be that loud?

 

[DevilDog]

I cant speak for all of them, but i noticed when i first got my yukon, it had one that made alot of noise, so i replaced it, didnt have alot of cash at the moment so i bought the cheapest one they had and it seemed to be louder than the other after a few days. When i finally bought a good high quality replacement the noise was gone. So i dont know if its just the different construction of the parts but just my experience.