Whistling sound
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Joined: Sep 2005
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From: Central Maine
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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Junior Member
Joined: Sep 2005
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From: Central Maine
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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From: Lethbridge, Alberta, _______Canada._______ West Coast Bonneville Fest ___05,06,07 Survivor___
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..
If a major line was unhooked, the car would idle like crap basically..
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From: Ames, Iowa
Re: Whistling sound
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
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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From: Ames, Iowa
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="MOS95B"]
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
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
