Name that noise! (Video)
Thread Starter
Le Mans Master
Joined: Dec 2003
Posts: 7,457
Likes: 144
From: NC
Name that noise! (Video)
Well I didn't have much luck asking about this last time cause it is a little hard to describe the noise coming out of the right rear end of my 2001 coupe, 6-spd. So, I recorded it with my digital camera and faithfully, as it is every morning, the noise was there. And it was a beauty. When you listen to this, think how you would try to describe this to the dealer. It only does it in the morning or after sitting for a few hours and it is a pretty heavy metallic sound. The car is going to the dealer tomorrow evening so it will be looked at Thursday morning. I have already crawled under the car and found nothing apparently loose when i put the wrench on. When i jacked up one side of the rear end, I rolled the tire forward and backward and personally felt like there was a lot of slop but don't have a new one to compare it to. The dealer told me it was likely the clutch plates just needing to get down the road so the oil gets on them (when I asked about it yesterday). The noise is only there in the first little while of driving it. Car only has 27k on it. So, what do you think the noise is? Pay particular attention to when i cut the wheel to the left.
http://www.cerinosolutions.com/vettenoise.mpg
http://www.cerinosolutions.com/vettenoise.mpg
Safety Car
Joined: Nov 2003
Posts: 4,979
Likes: 5
From: San Diego, CA "leaf" "tee" "e"
Originally Posted by cerino2000
I have already crawled under the car and found nothing apparently loose when i put the wrench on.
Here's David Farmer's fastener torque sheet: http://www.metricchemical.com/C5torque.pdf
Thread Starter
Le Mans Master
Joined: Dec 2003
Posts: 7,457
Likes: 144
From: NC
I agree about the torque wrench thing but as obnoxious as that noise is at such a low stress situation, I find it hard to believe that something that wasn't hand loose could cause that much racket. Everything was awefully tight that I checked. My vote is that it is inside the rear end itself.
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Thread Starter
Le Mans Master
Joined: Dec 2003
Posts: 7,457
Likes: 144
From: NC
Talked to the dealer. They are doing a handful of work to the car. Said they were able to reproduce the noise. They called the "Tech" line and it was suggested (naturally the easy route) to 'service' it....or in other words, change the rear end fluid. Said they haven't had a chance to drive it yet (since they are also doing the intake swap recall on 2001's). Seems to be awefully loud to be able to just change the fluid but we'll see. Should have it back tomorrow evening.
Sorry...check the cat back exhaust for a bad pipe hanger. There isn't much clearance between the steel heat guards and the pipe.
Instructor
Joined: Jun 2004
Posts: 230
Likes: 0
From: Tumon GU
Originally Posted by leaftye
You could crank everything super-tight with a 3/8" wrench and still only get things half as tight as they're supposed to be. If you don't put a torque wrench on it, you'll never know. Don't expect your dealer's mechanic to use a torque wrench either. The only way to get it done right is to get yourself a 1/2" torque wrench good up to 125 lbs-ft, some 18mm and 22mm short and deep sockets, and check it out yourself. Anyway, after I got my car back from the dealership, many of the bolts were up to 50% off spec, but nothing felt loose at all and actually felt very hand-tight.
Here's David Farmer's fastener torque sheet: http://www.metricchemical.com/C5torque.pdf
Here's David Farmer's fastener torque sheet: http://www.metricchemical.com/C5torque.pdf
Thread Starter
Le Mans Master
Joined: Dec 2003
Posts: 7,457
Likes: 144
From: NC
Well, I got it back. So far so good. They claim they simply needed to "service" it or in other word, they put new fluid in it. I swear they must have picked the youngest guy in the shop to work on it. Now it has a new noise. Going over bumps on in the drivers rear it has a new rattle. I am assuming that they had to take off the drivers side exhaust to do the seal axle and cover. The drivers side exhaust sits lower than the other side (didn't before) and I can move it up or down and reproduce the noise. I swear, if you want to get anything done right you have do it your self. I think he forgot to tighten up a hanger.
Resident moron
Joined: Jun 2003
Posts: 4,746
Likes: 20
From: Assachusetts
Sounds like the clutch plates in the diff chattering. Needs a fluid change with GM limited slip additive (or just add the additive).
They probably didn't tighten the 2 bolt flange before the rear axle on that side, hence the clanging.
Dope
They probably didn't tighten the 2 bolt flange before the rear axle on that side, hence the clanging.
Dope
Safety Car
Joined: Nov 2003
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From: San Diego, CA "leaf" "tee" "e"
Originally Posted by cerino2000
The drivers side exhaust sits lower than the other side (didn't before) and I can move it up or down and reproduce the noise.
Thread Starter
Le Mans Master
Joined: Dec 2003
Posts: 7,457
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From: NC
Ya, all seems well. The rear end is more quiet than ever. Doesn't make ANY noise. The real test will be in the morning. The loose exhaust was at the very rear of the car. A 2 bolt hold down that the muffler support slips into hadn't been tightened. All seems well.
Burning Brakes
Joined: Jul 2003
Posts: 933
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From: Rock Hill SC
Originally Posted by cerino2000
Talked to the dealer. They are doing a handful of work to the car. Said they were able to reproduce the noise. They called the "Tech" line and it was suggested (naturally the easy route) to 'service' it....or in other words, change the rear end fluid. Said they haven't had a chance to drive it yet (since they are also doing the intake swap recall on 2001's). Seems to be awefully loud to be able to just change the fluid but we'll see. Should have it back tomorrow evening.
Thread Starter
Le Mans Master
Joined: Dec 2003
Posts: 7,457
Likes: 144
From: NC
Actually, it was a bulletin. Whistling noise is what it was under. They did the swap but honestly, that whistle was still there. It is not really annoying, but in the event it was a problem, I wanted to eliminate it while the warranty was still good. Unfortunately, the car is back in the shop once again. I thought it was kinda funny but when i got it back, the AC turned itself on. I blew it off as imagination or that I bumped it or something. Took it to work today and realized that it is not switching from floor, to defrost, to vent etc...it is stuck in the middle of all of them. Actuator had been replaced less than 1000 miles ago. Then at lunch, I got a hard check engine light come on. Dropped it at the dealer, hope to have it back tomorrow. I am quickly losing faith in the reliability area. I am going to go ahead and drop the dime on the extended warranty. Hopefully this set of events is just a fluke. I mentioned to the dealer about the mechanic not tightening up the exhaust and he told me that that young guy is one of 2 master techs there! I said, ok, so long as you have faith in him I will take your word for it until I have reason otherwise.
Safety Car
Joined: Nov 2003
Posts: 4,979
Likes: 5
From: San Diego, CA "leaf" "tee" "e"
Your A/C problem is almost certainly due to a bad vacuum hose that goes into the firewall below the battery. This came up in a great thread a couple weeks ago. Hose failures are usually caused by a battery that leaked previously. If I'm right, this thread has what you need:
http://forums.corvetteforum.com/show...highlight=hose
http://forums.corvetteforum.com/show...highlight=hose