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Old 06-30-2014, 08:29 PM   #1
brettule
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Default Irritating rattle from exhaust?

I've got a 2009 Impreza RX and at around 2100 - 2200 RPM there is a rattle which resonates from around the engine/gearbox area. It only happens in that rev range and only under light acceleration or deceleration. If I put the boot in I don't hear it. My gut feeling is it's a rattle coming from the exhaust somewhere, it's reaching some point of resonation and that's causing the rattle. I've crawled under the car and can't find anything loose with the exhaust. It doesn't seem to have any other impact, it's not very loud but I notice it and it's annoying. Any thoughts people? I'm wondering if it's a common problem?
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Old 06-30-2014, 09:03 PM   #2
bluesguyej25
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heatshield?
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Old 06-30-2014, 09:04 PM   #3
James2.5i
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Its the heatshield. What's an RX?
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Old 06-30-2014, 09:31 PM   #4
brettule
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Is it just a loose nut or something on the heatshield?

"Subaru Australia released the third generation hatchback in September 2007. Naturally aspirated 2.0-liter versions fell under the R, RX and RS trims, with the turbocharged 2.5-liter reserved for the WRX. The sedan body style came later in 2008, paralleling the hatchbacks's model range."
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Old 06-30-2014, 09:47 PM   #5
James2.5i
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Its just the heatshield itself not having enough support, so it can vibrate.
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Old 06-30-2014, 09:56 PM   #6
brettule
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Is there a permanent fix/mod for the problem?

Which heat shield is likely the culrpit?

Last edited by brettule; 07-01-2014 at 12:53 AM.
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Old 07-02-2014, 08:47 PM   #7
Brian894x4
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Rocks get in the heat shields also and then get trapped. The shields sometimes have drain holes and the rocks will get lodged in those. If you look under your car, you might see a few and be able to crush them with pliers and pull them out without having to remove the heat shields. Otherwise, its a matter of narrowing it down by sound and then removing the shields and dumping the rocks out. Really common if you drive on dirt or gravel roads a alot or do any of kind of off roading.
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