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<blockquote data-quote="cpscoachtech" data-source="post: 30331" data-attributes="member: 9632"><p>I recently had my manifold off and cleaned it and decided to make it just a wee bit larger hole. I believe I went too big and it started the whirring sound. Quite annoying. Not sure what to do other than remove the manifold and drill a smaller hole into a small piece of metal and jb weld it over the larger hole to stop the vacuum. I put the old unvented oil cap back on and the noise subsided. Now I wonder what issues could be happening. Should I go back to the oil catch can I have installed and repair the pcv hole on manifold or leave it as is? Ironically, I think it was worse because I was changing the timing chain and guides at the same time and I put the main seal on the &quot;harmonic balancer&quot; backwards. So the pressure was building and a 2 hour drive pushed all my oil out of the seal. So, larger pcv and seal that was not sealing on the main equaled lots of noise. Yeah, I feel stupid but I didn't know which way it was suppsoed to sit. Makes sense now. Live and learn I suppose. 2013 Nox with 2.4l Ecotec.&nbsp; The question is how large is the actual hole supposed to be?</p></blockquote><p></p>

[QUOTE="cpscoachtech, post: 30331, member: 9632"] I recently had my manifold off and cleaned it and decided to make it just a wee bit larger hole. I believe I went too big and it started the whirring sound. Quite annoying. Not sure what to do other than remove the manifold and drill a smaller hole into a small piece of metal and jb weld it over the larger hole to stop the vacuum. I put the old unvented oil cap back on and the noise subsided. Now I wonder what issues could be happening. Should I go back to the oil catch can I have installed and repair the pcv hole on manifold or leave it as is? Ironically, I think it was worse because I was changing the timing chain and guides at the same time and I put the main seal on the "harmonic balancer" backwards. So the pressure was building and a 2 hour drive pushed all my oil out of the seal. So, larger pcv and seal that was not sealing on the main equaled lots of noise. Yeah, I feel stupid but I didn't know which way it was suppsoed to sit. Makes sense now. Live and learn I suppose. 2013 Nox with 2.4l Ecotec. The question is how large is the actual hole supposed to be? [/QUOTE]

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