My car is turgocharged but I'm sure it'll apply to all. Those of you who have misfiring problems, stuttering at certain rpms or smell rich fuel mixture, problem may not always be wires, coil or plugs. My rpm would jump up and down at idle and almost dies out sometimes. Sounds familiar to some of you? Well problem can also means vacuum related which mine was. My pcv check valve fronm the vavle cover to the intake mani went bad. Sometimes it would suck and blow both ways and when I shook it, it made quite a rattling noise. Got me a new check valve from autozone for like 2 somthing and the problem went away. So take this notice and remember it noobs.

WAIT! It's not supposed to rattle? OMG. You = hero. I always assumed it was still good since it moved freely.


I am such a choad. I myself, just pwn3d myself.

Daisy! To AutoZone! Away! :p

It IS supposed to rattle guys...if it isnt rattling its stuck...

yeah, it is supposed to rattle

not rattle excessively. It rattles enough so that you can hear the flap open and close. But if it rattle excessively, and you can blow through both ways....it's a bad apple.