Focus Fanatics - View Single Post - 3000 RPM/70 MPH Engine Drone
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Old 10-04-2012, 02:38 PM   #4
Vegoose
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Join Date: Sep 2012
Fan#: 104195
Location: Las Vegas, NV
What I Drive: 2006 Focus ZX4 SE

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Quote:
Originally Posted by S0C0nFused View Post
Also, Are you inferring a sympathetic harmonic, or just the exhaust note/volume?
I would say it sounds more like a harmonic. At lower mph, but the same engine RPM, the sound is not as loud. I've check out the exhaust system and cant see any obvious leaks. The car has spent its entire life in Las Vegas so rust/corrosion isn't an issue.

I also noticed that small bumps cause the noise to go away for a moment, which is making me wonder if the motor mount is the issue. Maybe when I hit a bump it allows the engine to rise up in the passenger side mount and the noise is reduced?
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