High Pitch Squeal From Engine with Belts Off - 986 Forum - The Community for Porsche Boxster & Cayman Owners

jcb986 · 04-18-2010, 07:58 AM

Yes, I just ran the engine until it started squealing...loosen the oil cap up and it stopped. Looks like I will replace here soon, was going to change the oil and install a new fuel filter, so I will do this all at once. Thanks.

deliriousga · 04-20-2010, 07:35 PM

When you replace the AOS, replace the hose that connects to it (not the little bellows that's on the bottom of the separator). Mine had a small crack in it and that is what caused the squeal after I replaced the bad AOS

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jcb986 · 04-21-2010, 05:09 PM

Quote:

Originally Posted by deliriousga

When you replace the AOS, replace the hose that connects to it (not the little bellows that's on the bottom of the separator). Mine had a small crack in it and that is what caused the squeal after I replaced the bad AOS

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I purchased everything but bottom hose. Seems no one changes it.

Kochman · 04-28-2010, 05:36 PM

This definately sounds like the problem I had a few months ago. It turnred out to be the Air/Oil Separator. If you let it go too far you will see more smoke comming from your exhaust. It is always a good idea to replace all associated hoses while you have it open.
Not a big expense to fix.