Strange chirp sound. Now with a video. FINALLY FIXED! - Page 2 - 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 03-14-2008, 04:07 AM   #11
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Quote:
Originally Posted by willwren
When was the last time you messed with your PCV?

Have you tried pulling your oil cap at idle while the sound is happening? Try it. Tell us the results.

Have you tried this yet? The PCV system is used to ventillate the crankcase. This will tell you if it is from this system
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Old 03-14-2008, 10:40 AM   #12
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[ahem]
Quote:
Originally Posted by rstrunk
Quote:
Originally Posted by willwren
When was the last time you messed with your PCV?

Have you tried pulling your oil cap at idle while the sound is happening? Try it. Tell us the results.
I checked it today by taking off the oil cap and nothing happened. The noise stayed the same. Didn't get louder or quieter just stayed the same.
[/ahem]

Alright. In #1, that is the vacuum tree, or stem, or whatever you want to call it...

in number 2, you could either be pointing to the transmission modulator or the cruise servo once again...but since you said its UNDER the upper radiator hose, I'm guessing he transmission modulator, however, I don't think these would be the culprit.

Maybe a mechanic'* stethoscope?

video would help of the noise possibly.
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Old 03-16-2008, 01:06 AM   #13
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Quote:
Originally Posted by wjcollier07
[ahem]
Quote:
Originally Posted by rstrunk
Quote:
Originally Posted by willwren
When was the last time you messed with your PCV?

Have you tried pulling your oil cap at idle while the sound is happening? Try it. Tell us the results.
I checked it today by taking off the oil cap and nothing happened. The noise stayed the same. Didn't get louder or quieter just stayed the same.
[/ahem]

Alright. In #1, that is the vacuum tree, or stem, or whatever you want to call it...

in number 2, you could either be pointing to the transmission modulator or the cruise servo once again...but since you said its UNDER the upper radiator hose, I'm guessing he transmission modulator, however, I don't think these would be the culprit.

Maybe a mechanic'* stethoscope?

video would help of the noise possibly.
I can try to get a stethoscope and see what I can find. Is it possible that anything that has to do with the anti lock brakes may be causing this?
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Old 03-16-2008, 11:59 AM   #14
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Not ANTILOCK brakes, but brakes, sure. If it is though, you didn't describe your problem correctly.

Is it only when braking? Only when moving? Increasing in frequency based on wheel speed or engine speed?

Antilock braking systems are benign and don't make noise. Noise comes from the hardware for the brake systems.
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Old 03-16-2008, 12:53 PM   #15
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Quote:
Originally Posted by willwren
Not ANTILOCK brakes, but brakes, sure. If it is though, you didn't describe your problem correctly.

Is it only when braking? Only when moving? Increasing in frequency based on wheel speed or engine speed?

Antilock braking systems are benign and don't make noise. Noise comes from the hardware for the brake systems.
No. That'* why i ruled out brakes originally. It seems to happen and get worse with more application of the brakes but if I come to a stop and put it in park it still often keeps doing it.

But if I put it in drive it stops happening. Sometimes when i take off it seems to squeal louder with the engine rpms for a second then quits. But most often, as soon as I give it gas and go it stops. Then while slowing down and the engine rpms get to about 1000 and especially while hitting the brakes it seems to come back. If I hit the brakes and it starts sqealing and I roll through a stop or yield sign it seems to stop when letting off the brakes and accelerating.

I'm 99% positive it isn't worn brake pads causing this because it still does it even after stopped and while the car is in park. Funny thing is the weather has been a little warmer the past couple days and it has gotten to where it has almost stopped and one of the days on my way to work it was abou 60+ degrees and it didn't do it at all. This is frustrating.

It almost sounds like something (unsure what it could be) is hanging around the fans and when I stop the momentum of the car decelerating forces it into the fan and cases a shrilling or squeaking sound. haha

I just haven't ran across a squeal or noise that was so hard to pinpoint before. It may be coming from internally in the engine but what could it possibly be? That is my worst worry. But I just can't think of any internal parts that would cause a shrill squealing sound. My oil light comes on at start up and stays on for maybe a minute then goes off and my oil pressure always reads 50 - 60 lbs.

I'm just at a loss here. I can get out my digital camera and take some video (and that will not be good picture quality) IF I can get it to squeal and catch it on film. But it will be so hard to film the squeal while driving, when it happens the worst. This is killin' me.
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Old 03-16-2008, 12:57 PM   #16
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Cheap belts will squeal when cold, and low tension on your power steering pump will cause squeal also. Does it get better or worse if you steer to full-lock?

Have you tried some belt dressing when cold?
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Old 03-16-2008, 01:03 PM   #17
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Quote:
Originally Posted by willwren
Cheap belts will squeal when cold, and low tension on your power steering pump will cause squeal also. Does it get better or worse if you steer to full-lock?

Have you tried some belt dressing when cold?
No, I haven't tried belt dressing. I have checked the power steering fluid and it is full. I can't recall it getting worse while turning the wheel but I should check that out. The belt probably is old enough to be replaced. The noise doesn't seem to be coming from that part of the engine though. It seems to originate from the transmission side or even the fron but i'm sure the echoes could play tricks on the naked ear. As far as when it'* warmer outside, I'm not sure if that is a factor, I do know that if it'* cold outside it doesn't seem to matter if the engine is warmed to full operating temp, it doesn't get much better if at all.

Sorry that i have to explain such a hard thing to discuss by words (or typing in this case) I'm sure it'* quite hard to say without seeing and hearing it in person.
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Old 03-16-2008, 01:09 PM   #18
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BTW, If I do replace the belt is my car one of the ones that need to remove an engine mount to get to things like the belt and water pump etc?
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Old 03-16-2008, 01:31 PM   #19
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I cannot remember if your belt goes above or below the engine mount, I know my SSEi went through it so it had to be removed. Its quite simple, just put a jack under the engine with a piece of wood big enough to cover the whole engine an so as not to dent or ruin it, take the bolts off that hold the engine mount to the body of the car, jack the engine up just enough to get the old belt out and the new one in, and lower the jack back down, put the bolts back in and then put the belt back on. Another thing i think you should check though is your tensioner pulley, on my 94SSE i used to have and also my moms 91 they did the exact same thing, it was only at idle be it a light or just sitting in the driveway. And may I make a suggestion on a good belt, get a gatorback. They last forever so it seems, i have always had good luck with them. i bought one for my grand prix the day i got it 2 years ago and 70,000 miles later it still looks brand new
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Old 03-16-2008, 01:41 PM   #20
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Series 1 cars (L27 and L67) don't have a belt through the mount. Only Series 2 96-99.
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