Car problems, buzzing/rattling and brakes freezing

[kevjam79]

Any news on the buzz? I have the same heat shield buzz at the same RPMs. It is likely the same location. It does seem to be coming from the near front driver side. I may take a look this week.


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[kevjam79]

Found the buzz. It was the cam gear cover on the passenger side. See foam inserted in pic. I will likely use some 3m tape to dampen as a final solution. I also secured the flimsy plastic on the core support with tape. See attached pics.






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[kevjam79]

Wow !! What a difference two pieces of foam make!! The engine would growl and buzz at more than the 2K to 3K RPM range. Now it is smooth and quiet. The buzzing was definitely in that range and worse when it was colder. But before it would occur across the majority of the power band, the car would create what I thought was intake or exhaust growl. It is now gone. Which is nice. I also think there may have been an unintended side effect. In other cars that I have owned in the past, phantom knock would create problems, throw CELs and pull timing. It is possible that that the vibration was creating enough noise in the knock sensor receiver that it could not adequately adjust for true knock. My butt dyno says power deliver from 2k to 3.5k is smoother. It could be the placebo effect but it definitely feels different.

Long story short; finding the vibration made an improvement in the car.

I hope this helps your issue.


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[Rowdy_Sonic_RS]

I have been having the same issues. I contacted GM about the issue. I bought my car 7 months ago and have this issue when tempratures drop beloew freezing. I don't know if any of you are okay with this issue but I must say I am furious. I have had just about every issue reported on my Sonic. Freezing breaks, rattle under the hood, the plastic piece infront of the windshield coming loose. The only issue I haven't had yet which apears after 2 years apparently is oil leaks from the manifold. My car is completely stock. I don't know about you all but I didn't get rid of a old truck that didn't have any issues to buy a new car that has issues that a car over 100k miles should have.