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Old 05-19-2016, 04:44 PM   #1
shadymaro
 
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Arrow CAN SOMEONE PLEASE TELL ME WHAT THIS NOISE IS?

I have a 2011 Camaro SS (6MT). I have been hearing wierd rattling sound coming from under the car. When I do a cold start, the car is jerkier with less power. But when it warms up, the car is smoother with more power and no rattle. I do not hear the rattling when I do a cold start. It happens only after it warms up and has been driven. It rattles at low rpms, and when I rev up the car. Here is the video of the noise.

https://youtu.be/rcBiFExFpig

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Old 05-19-2016, 05:36 PM   #2
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Hard to tell from the vid. It almost sounds like a belt, but if it's coming from underneath, it could be an exhaust rattle
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Old 05-19-2016, 05:38 PM   #3
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Originally Posted by gzobian View Post
Hard to tell from the vid. It almost sounds like a belt, but if it's coming from underneath, it could be an exhaust rattle

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Old 05-19-2016, 08:27 PM   #4
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Check the tunnel cross brace for contact with your exhaust. As far as less power and jerky, I notice my 11 is a bit jerky at very low speeds and load when it's cold. But once it gets going it's no problem.
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Old 05-19-2016, 08:31 PM   #5
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Originally Posted by JerTM View Post
Check the tunnel cross brace for contact with your exhaust. As far as less power and jerky, I notice my 11 is a bit jerky at very low speeds and load when it's cold. But once it gets going it's no problem.
I appreciate the advice! I went and ran some live data on my o2s and number 2 was acting up haha. Supposed to stay at .5v haha so it may or may not have something to do with the power. https://vimeo.com/167362790

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Old 05-19-2016, 08:44 PM   #6
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Which sensor are you looking at? Only the upstream 02s will affect the way a car runs. On cold startup you car is in open loop which means it ignores input from them anyway and goes off a base value. Downstream O2s will only monitor the efficiency of the catalyst and in no way affect the fuel trims.
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Old 05-19-2016, 08:46 PM   #7
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It was warm. So when the motor gets to temperature, the pcm starts? Holy s*** that's advanced haha.

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Old 05-19-2016, 08:47 PM   #8
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Quote:
Originally Posted by JerTM View Post
Which sensor are you looking at? Only the upstream 02s will affect the way a car runs. On cold startup you car is in open loop which means it ignores input from them anyway and goes off a base value. Downstream O2s will only monitor the efficiency of the catalyst and in no way affect the fuel trims.
Idk I guess it was downstream because it would change when I rev

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Old 05-26-2016, 07:42 PM   #9
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Sounds like an exhaust rattle. May want to take a look at crossbraces, heat shields, and anything else that comes close. When the car is warm, the exhaust pipes expand, and is sometimes just enough to come into contact with something else.
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