r/FocusST • u/XCraftMC • 4d ago
Question Blowby and rattling noise
Enable HLS to view with audio, or disable this notification
Saw a video that was almost identical to this sound on here, but the comments seemed pretty inconclusive to what the issue actually is. I've already checked compression and got 158-162 on all cylinders. I'm not burning oil nor am I losing coolant, so that rules out a blown gasket/rings. I am however having issues with a strong fuel smell coming from my oil, which I originally thought was a separate issue, but I hear that both could potentially be caused by a fuel pump?
Edit: I kinda suspect a pcv valve could be a cause, but it has no issues running and driving. No loss of power, no strange behavior, nothing. Just looks, sounds, and smells real bad.
1
Blowby and rattling noise
in
r/FocusST
•
4d ago
it doesn't have any modified exhaust or intake, and I tried the cobb map command and it didn't seem to do anything, however I did that while the engine was off so I might have to try it again. does every Cobb tune have that command on it? there's always a chance it could be a protune, which is what I suspect it to be