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Message: <blockquote data-quote="mirageman" data-source="post: 27283" data-attributes="member: 6542"><p>Hello all. 2012 2.4 equinox w/160k miles. I have a loud whirring sound at idle. It is resonating throughout the engine compartment, but seems to be more on the driver's side. It sounds like a bearing howl from an alternator. I have a video which I will try to upload which demonstrates it well. When cold, it doesn't seem to do it. It will do it after a few minutes of running. It started just after I replaced my holey and rusted and ripped oil dipstick tube. Now that I replaced the oil dipstick tube with a new one, I have this noise. Now if I pull out the oil dipstick, the noise stops. There is a vacuum present at the dipstick tube opening. I am not sure if I am supposed to feel any there. There is vacuum at the oil fill cap, too. It will suck the oil fill cap down. There is pretty strong vacuum at the short "L" hose on the left side of the intake plenum which goes into the valve cover. I have just recently cleaned out a non-blocked pcv hole in the intake manifold and head. It has never been blocked. The noise sounds like a bearing howl, but it obviously is not a bearing since removal of the oil dipstick will immediately stop the noise. This is a pcv air issue that I probably had for a long time and is only showing now with a new dipstick tube that doesn't leak air. I tried looking for air leaks by blowing into tubes attached to the intake.  I cannot blow air into the hose that goes to the brake booster, nor can I blow into the hose that goes to the fuel vapor purge thing. I am worried that a year ago or whatever, I may have drilled open the pcv hole in the intake manifold like someone did on the internet. If I did it, I know it was the absolute minimum overdrill, just enough to scrape the sides of the hole, you know? Do you think that minimal amount of extra hole created too much vacuum in the crankcase, and the noise is coming from resonating air trying to get sucked in?</p></blockquote><p></p>

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