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Old 09-09-2011, 12:41 PM   #11
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The oil pressure sender is on the oil filter bracket.

I kind of wonder if it'* a vacuum leak. Check around the fuel injector, #2 is the one I would be looking at.
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Old 09-12-2011, 08:15 AM   #12
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When you hear the noise, open the oil filler cap on the valve cover. If it goes away. The most common cause is pcv missing an o-ring. I haven't seen the vids because this place doesn't allow it... but that'* about the only thing Dan hasn't suggested, off the top of my head.
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Old 09-21-2011, 12:53 AM   #13
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We'll a little more information. I've had two mechanics come by and look at it, one brought a stethoscope with him. They both hear the noise coming from under the rear valve cover. Just for giggles on the suggestion of one of the mechanics i changed the oil and filter with 10w30 and added a quart of Lucas Oil treatment (I dont plan on keeping the lucas in there for long). The noise is about the same if not a little more intermittent. I removed the oil filler cap and the oil filler housing while the engine was idling so I could look into the engine and didn't see any oil movement in there. I figured I'd see all kinds of oil sloshing around. I'm wondering at this point if I don't have an oil pressure issue. I've read where someone had a stuck check valve and also read where the oil pump in the late model 3800'* are pretty bullet proof so I'm not sure what to check next.

Any suggestions form here? Thanks!
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Old 09-21-2011, 08:39 AM   #14
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If it seems to be coming from under the valve cover, you may want to remove the cover and have a look. You could also check the PCV valve. It may be stuck and what your hearing is a vacuum leak.
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Old 09-21-2011, 09:53 AM   #15
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It didn't stop when you pulled the valve cover oil fill cap, right? If so, it'* not pcv.

Squealing could be vacuum leak. I need to see these vids.
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Old 09-21-2011, 12:10 PM   #16
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Thanks guys, the noise didn't stop with the Oil Cap off. Take a look at the vids for sure. I'll try to get one more in an hour or so looking into the engine with the oil cap off..
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Old 09-21-2011, 12:15 PM   #17
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Like Bill said, if the noise didn't stop with the cap off then it'* not the PCV
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Old 04-07-2012, 11:45 AM   #18
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Sorry to wait so long to tie this one off. It ended up being a failed bearing keeping the oil pressure from building up. I sourced a 2004 3800 engine from a reputable junkyard with 66,000 miles on it. I had my mechanic do the new plenum when he did the engine swap it should be good to go for a while. It purrs like a kitten. I just had my fuel pump start acting up though... Starting a new thread. Thank you ALL for your help!
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