Strange New Noise

[wwomanC6]

CheySha and I heard a strange new noise coming out from under my Vette tonight. Sounds like a vibration noise coming from the rear end area. We only hear it when its in gear. Goes away When put in park. I crawled under there to pin point were its coming from. Sounds like the front of the transmittion/torque shaft connection area. To me it sounded like the front trans housing area. Any ideas what the issue might be?
I have an automatic.

:squirrelrun:

[03SlowZ06]

Your general area might be kinda this general area description does not help alot. LOL.

Does it sound like metal on metal or just something loose sitting on the tranny bounceing round?

I would feel around to see if any of the harnesses have come off the cheesy little clips and is bouncing around. Also I can see the maybe the brake lines rattling might be the cause. Lastly gently put pressure on the exhaust tips when it makes the noise to see it maybe one of the hangers is squeeking.

[CheySha]

Wellllll it sort of sounded like a tink clang rattle bang and it sounded like it was somewhere in the left of the middle right close to the back but towards the front.

[wwomanC6]

Felt around the exhaust pipes for loose clamps & clips. Will check the brake lines and hangers tomorrow and let ya know.

To me it didn't sound like metal on metal but more like something metal rattling or and exhaust leak rattle.

[Defib1961]

Wellllll it sort of sounded like a tink clang rattle bang and it sounded like it was somewhere in the left of the middle right close to the back but towards the front.

EXACTLY where mine was.

[wwomanC6]

Wellllll it sort of sounded like a tink clang rattle bang and it sounded like it was somewhere in the left of the middle right close to the back but towards the front.

:lolsmile: Your funny!!!:lolsmile:

[thegreenman]

Do you have NPP? I think they make a clang bang rattle tink noise instead of the tink clang rattle bang sound. If you have NPP the butterfly's could be rattling.

[03SlowZ06]

Felt around the exhaust pipes for loose clamps & clips. Will check the brake lines and hangers tomorrow and let ya know.

To me it didn't sound like metal on metal but more like something metal rattling or and exhaust leak rattle.
Sounds like a very good place to start. I can also picture one of the H pipe hangers with the spring ( I think your c6 uses the same) hangers rattling.

[wwomanC6]

Have stock exhaust, and I saw those springs you were referring to but did not check them.

[thegreenman]

I am thinking exhaust somewhere, just barley touching something, you want at least 1/4 clearance from the exhaust. My header was hitting my subframe and was only noisy when in gear also, I found it by seeing rub mark on the header.

[CheySha]

Sorry Wendy I was distracted by the WS game LOL... I don't know how to really describe it but maybe we can make an audio clip of it and post it along with a pic of the where it's coming from?

[wwomanC6]

I figured as much! :lol:

We can do that tomorrow evening if I cant find the problem looking at the things mentioned!:yesnod: :cheers:

:squirrelrun:

[CheySha]

I think it's more of a grinding noise... Like when a clutch gets too hot... That's almost what it sounds like to me...

[Sneaks]

Possible torque tube bearing going bad? Use a stethescope to listen along the driveline near the point where you kinda sorta hear the clang bang rattle tink grind.
Just make sure the Squirrell is up on a lift or jackstands(well supported) when you put it in gear and try to listen. You're nice and slim Wendy, but not slim enough to go hanging upside down under the Squirrell with a scope in your ear. :rofl:

[DropTheTop]

Wellllll it sort of sounded like a tink clang rattle bang and it sounded like it was somewhere in the left of the middle right close to the back but towards the front.

:lolsmile: :lol: I loves me a good smart ass!! :rep:

[lutzdog]

a woman that will crawl under her vette and troubleshoot. the only thing hotter than that is if she was wearing a lacy g-string while holding a beer while doing it..

[Y2Kvert4me]

We only hear it when its in gear. Goes away When put in park. Try door # 3, tell us if the noise is there or not in neutral. (there is a difference) :D

A4 cars have different engine idle speeds depending on if "in gear", or "park/neutral". Based on your description, my inclination is that it's probably not something rotating, but is making noise by resonating at the lower idle RPM frequency which happens only when in gear.

You can test this easily, with the car on the ground, by placing the car in Drive, holding your foot on the brake, and giving it just a LITTLE throttle to bring the RPMs up off normal idle some (at/near/not over 1000 RPM). Does the noise remain or disappear? Or does it get worse?

And if you find there is a difference between park and neutral, it would quickly point to the tq converter, even though the resultant noise would likely be heard downstream.

:cheers:

[wwomanC6]

No noise in park or neutral, All others yes.

"but is making noise by resonating at the lower idle RPM frequency which happens only when in gear." - YES

You can test this easily, with the car on the ground, by placing the car in Drive, holding your foot on the brake, and giving it just a LITTLE throttle to bring the RPMs up off normal idle some (at/near/not over 1000 RPM). Does the noise remain or disappear?

DISAPPEARS

Recorded a video & trying to get it on you tube.

[Y2Kvert4me]

Your replies point to an exhaust vibration issue. (good news for you - probably nothing serious).

The C5 commonly suffered from the same thing, although mine never had this trouble (though I would never hear it on my car even if it was), am not sure of the real fix.

Hopefully you can reply to this reply, as I've done nothing on the other end to change things...


:cheers:

[wwomanC6]

Talked to Johnny (Posse Peep). Him and a Josh(Resurrection Auto/Vette Mech) said the same thing along the same lines with your diagnoses. We are gonna put it on the lift this afternoon to try and find the problem. :cheers:

:squirrelrun:

[wwomanC6]

The noise is coming from the torque converter. Took off the access plug, no sign of fluid. Everything looks OK, nothing loose that we can tell. But that exactly were it's coming from. Johnny described it as a flutter.

:squirrelrun:

[wwomanC6]

Took the Squirrel to a Vette friend who is a mechanic. Torque tube bearing is going bad and making the rattling noise. Looks like Sat we will be dropping the rear end and changing the torque tube bearings.

[Garb55]

Could be worse, good luck and hope all go's well..

[03SlowZ06]

Thats a fun job. Did 2 in a week last spring. Dropping the rear that is.

[Munch]

Took the Squirrel to a Vette friend who is a mechanic. Torque tube bearing is going bad and making the rattling noise. Looks like Sat we will be dropping the rear end and changing the torque tube bearings.

That sucks. I guess this means you'll be cutting back on the hole shots.:leaving:

[wwomanC6]

Ya'll be happy to know Squirrel is fixed and the strange new noise that was getting louder is gone! :hurray:

Will try to get pics posted tomorrow. May take a little bit my photobucket account is full! Toooo many smileys and pics! :D

:squirrelrun:

[Garb55]

Good to here all is back to normal.. http://www.thevettebarn.com/forums/images/icons/icon14.gif

[03SlowZ06]

I am glad you got it fixed.

[Munch]

:hurray:

[Sneaks]

Possible torque tube bearing going bad? Use a stethescope to listen along the driveline near the point where you kinda sorta hear the clang bang rattle tink grind.
Just make sure the Squirrell is up on a lift or jackstands(well supported) when you put it in gear and try to listen. You're nice and slim Wendy, but not slim enough to go hanging upside down under the Squirrell with a scope in your ear. :rofl:

Took the Squirrel to a Vette friend who is a mechanic. Torque tube bearing is going bad and making the rattling noise. Looks like Sat we will be dropping the rear end and changing the torque tube bearings.

You owe me 1 dozen oatmeal cookies for my expert diagnosis. :lol:
Glad you got it figured out, fixed, and back in shape Wendy. :thumbs:

[wwomanC6]

Finally have time to post those pics of the bad torque bearing change.

http://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/CarmaintenanceNov2010006.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010002.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010004.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010009.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010007.jpg

The noisy culprit right here!

http://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010010.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010011.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010013.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010014.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010015.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010017.jpg

The bad bearing was corroded.

http://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010018.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010025.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010028.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010030.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010021.jpg

Putting her back together

http://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010031.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010032.jpghttp://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010033.jpg

[thegreenman]

Did you see any signs of water getting in there to cause this?

[wwomanC6]

Did you see any signs of water getting in there to cause this?

That's what is strange. No sign of water, condensation or corrosion - except right there a the bearings and spiles!?! Still trying to figure that one out.

Here on the bolts opposite side of bearing housing

http://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010017.jpg

And here

http://i1089.photobucket.com/albums/i359/dixonwl/Vette%20Pics/torquebearingchange2010018.jpg

[thegreenman]

Strange, glad you got it fixed. Thanks for the pics, it helps me understand how it connected for a possible future upgrade.

[wwomanC6]

Your Welcome!:cheers:

:squirrelrun:

[ottomatic]

Thanks for the pics. I read the entire thread and took notes - filed away for future references. Nice job. Moderator: sticky this, please.

[wwomanC6]

Thanks for the pics. I read the entire thread and took notes - filed away for future references. Nice job. Moderator: sticky this, please.

Done! :cheers:

Some other Notes for ya'll:
We ended up removing the entire torque tube assembly in order to get the torque shaft out. Did not want to come out. Took some forceful coercion.

Something I learned that I did not know - C6 Automatic transmissions have the service port on the bottom back side of the tranny. Were as manual's servicing ports are on the top forward portion.