Whistling sound - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-22-2005, 08:41 PM   #1
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Default Whistling sound

Does anyone have an idea on what could cause excessive vac in the engine causing a suction, creating the "belt slipping sound" noise. I checked and replaced the pcv valve and o-ring. When I remove the oil fill cap, it has quite a suction, then the noise stops for a while then returns. does the engine internals require a vacume at all? Could I drill a small hole in my filler cap? Not sure what to do next. I just hope the whistling isn't air trying to go in through my main seals. Any ideas would be aprreciated. Thanks, Bill
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Old 10-22-2005, 09:08 PM   #2
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year, trim level (SE, SSE, SLE, SSEi), ect. please...
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Old 10-22-2005, 11:27 PM   #3
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1998 SE
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Old 10-22-2005, 11:39 PM   #4
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do any of your vacume assisted features not function or have limited functionability?
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Old 10-23-2005, 02:17 AM   #5
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everything seems to work ok. Bought this car recently, so there may be something that doesn't quite operate like it was new, but I don't recognize anything. What exactly are you refering to. Thanks, Bill
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Old 10-23-2005, 11:44 PM   #6
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I believe he is refering to things like the brake booster and the cruise control (I think) which use the vaccum system. For example, do your brakes feel normal?
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Old 10-23-2005, 11:49 PM   #7
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I could see a small leak in maybe something like the brake booster..but heres what has leaked on my 93. The line beside the booster assy, its small, it goes into a little nipple, controls the ventalation system, that has come loose on mine...
If a major line was unhooked, the car would idle like crap basically..
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Old 10-24-2005, 12:17 AM   #8
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Default Re: Whistling sound

Quote:
Originally Posted by Beeger
Does anyone have an idea on what could cause excessive vac in the engine causing a suction, creating the "belt slipping sound" noise. I checked and replaced the pcv valve and o-ring. When I remove the oil fill cap, it has quite a suction, then the noise stops for a while then returns. does the engine internals require a vacume at all? Could I drill a small hole in my filler cap? Not sure what to do next. I just hope the whistling isn't air trying to go in through my main seals. Any ideas would be aprreciated. Thanks, Bill
Don't drill a hole. Something ain't right. Take another look at the pcv valve. On my '95 there are two o-rings. A big one under the cover and a smaller one that fits around the pvc valve body and seals the crankcase port that the valve slips into. If this lower seal is not made, excess vacuum will be applied from the intake manifold around the pcv valve body and into the crankcase. Make sure you have the correct pcv valve. The weight of the valve is calibrated for your engine, and the length needs to be correct to make the seal as I recall. The excess vacuum can indeed cause problems with the seals on the ends of the crankshaft. It sucks dirt into them, pulls them into a position they are not used to, and can cause them to fail.

Your car, I think, will have a MAP sensor on top of the cover, but the principle is the same, just make sure the valve body makes a good seal in the crankcase hole preventing vacuum from bypassing the valve.
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Old 10-24-2005, 12:34 AM   #9
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This is from a post in February on the same subject. Notice the kit cited below includes two o-rings and a spring, too. I hope this is just for the 96-up L36, 'cuz I ain't got no spring either.


[quote="MOS95B"]
Quote:
Originally Posted by ron350
Hay John

You have a black o-ring that goes around the PCV valve and seals it in its bore. This o-ring can stay in the bore when the valve is removed and is hard to see, black on black. Without this o-ring you will have vacuum in the motor at idle. Remove the oil filler cap crank the car and put your hand over the hole. If your hand is held to the valve cover the PCV valve o-ring is missing or needs replacing.
When the o-ring is in place around the PCV valve it fits tightly in its bore. If you can remove or install your PCV valve easily with your fingers the o-ring is missing or needs replacing.

In Bills picture above it looks like the o-ring is still in its bore. You have to remove it from the bore and slide it on the PCV valve before reinstalling the valve.

L36 PCV valve kit comes with PCV-892C valve, black and large orange o-ring, spring and plastic cap.
Part # 89017274. $18. Dealer $11. Delco
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Old 10-24-2005, 04:09 AM   #10
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Almost 100% that it'* a PCV problem. I agree completely.
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