s3cf Posted May 1, 2017 Share Posted May 1, 2017 Hello I have recently notice this rattling noise with my car and hopefully I can obtain some inputs from you gents Car: 2005 outback 3.0L H6 with 85k miles When car is at full stop and in gear(foot on brake, shifter in Drive), there's some metal rattling noise coming from the frontend (underbody). There's no noticeable vibration just the rattling noise.... (if the gear is in neutral there's no rattling noise) The rattling noise goes away as soon as I lift my foot off the brake and the car starts to move. Car drives completely fine and normal, no weird noise beside the one I just described. Any idea? Thanks in advance. Link to comment Share on other sites More sharing options...
MilesA Posted May 1, 2017 Share Posted May 1, 2017 Could be loose heat shields around the exhaust system. Link to comment Share on other sites More sharing options...
whitetiger Posted May 1, 2017 Share Posted May 1, 2017 +1 to loose cat heat shields. my 05 ob 3.0r sdn did the same exact thing. Link to comment Share on other sites More sharing options...
s3cf Posted May 1, 2017 Author Share Posted May 1, 2017 ^ Thanks gents, I will definitely have the mechanic look into that next time when I bring the car for service. Link to comment Share on other sites More sharing options...
s3cf Posted May 1, 2017 Author Share Posted May 1, 2017 MilesA, whitetiger Care to explain why the rattling noise only occurs when the car is at full stop and in gear? Thanks Link to comment Share on other sites More sharing options...
Dispatch20 Posted May 1, 2017 Share Posted May 1, 2017 ^ Thanks gents, I will definitely have the mechanic look into that next time when I bring the car for service. Subaru's always get rattling heat shields as they age. Mechanics that see even small volumes of Subarus will be quick to spot this, and there are several quick fixes including sheetrock screws and large hose clamps. I'm sure it sounds like redneck fixes, but they are easier than welding and far cheaper than replacing a catalytic converter. The shields vibrate differently depending on the engine load. Only certain vibrations end up making metal-to-metal contact. Sometimes they rattle at idle, and sometimes during acceleration. Sometimes they only do it as the engine revs. Link to comment Share on other sites More sharing options...
whitetiger Posted May 1, 2017 Share Posted May 1, 2017 MilesA, whitetiger Care to explain why the rattling noise only occurs when the car is at full stop and in gear? Thanks harmonic vibration at that idle rpm. at higher rpm there is less vibration dues to engine smoothness. Link to comment Share on other sites More sharing options...
s3cf Posted May 1, 2017 Author Share Posted May 1, 2017 Thanks Dispatch20 and whitetiger. Link to comment Share on other sites More sharing options...
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