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post #1 of 6 (permalink) Old 01-24-2016, 05:46 AM Thread Starter
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Loud, Plasticky Vibrating Noise when Accelerating when Cold

I own two Cobalts, an '08 XFE bought new and an '09 bought used with 57K miles for my daughter. My '08 has been excellent; the '09 less so (new front wheel bearings, new converter and flex pipe (these two were warranty), and I have had the trans fluid and coolant replaced by the dealer on the '09, all in the past twelve months).

When the '09 (2.2, automatic) is cold, but not at idle or reverse, only when accelerating--there is a very loud, plastic vibration sound when accelerating that doesn't go away until the car is warmed up...then it is completely gone.

Anybody else experience anything like this?

Thank you in advance.
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post #2 of 6 (permalink) Old 01-24-2016, 06:04 AM
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Sounds like a broken heat shield on the exhaust manifold.

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post #3 of 6 (permalink) Old 01-24-2016, 07:20 AM Thread Starter
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Heat shield doesn't sound like too complicated a job or part cost; am I right or (gulp) wrong?

Thanks.
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post #4 of 6 (permalink) Old 01-24-2016, 07:34 AM
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Usually you can tack 'em down with a spot weld. When car is cold take the plastic engine cover off and tap on the shield, you'll see if it moves.

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post #5 of 6 (permalink) Old 01-24-2016, 03:28 PM Thread Starter
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Is the exhaust manifold heat shield something that would've been removed when a front flex pipe and converter would be installed?

Again, thanks in advance!
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post #6 of 6 (permalink) Old 01-24-2016, 05:37 PM
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No, unless they broke a stud and had to remove the exhaust manifold to repair the stud. You have to remove the shield to access the manifold bolts.

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