Yeah I know... another thread about rattles. I know because I read alot of them before making this one and I didn't really find my answers.
So I have a 14' BRZ with 21k miles, I bought it used 4 months ago, during the winter here in Montreal. I learned myself and by reading on this forums that this engine makes alot of weird noise during start-up/coldstart and i'm fine with that.
Recently, it started doing a weird vibration/rattle noise, seems coming from the engine, when I first start the car in the morning or after it sit a couple hours. It does it only for rougly ~10 seconds from what I guess is during the "cat pre-heat". Anyways, it doesnt sound cool at all, it's pretty loud in the car and it happens 100% of the time, every coldstart.
Recorded a small video in the engine bay, just after I started the car, @ 20 seconds, you can hear the engine sounds changing at then @ 31, its settle and idle nicely. Use computers speakers or headphones, its alot better.
Monday, I let the subaru dealer check it and they called me today saying they couldnt hear or reproduce the problem lol. The only thing they did is reflash the car with the latest TSB that fix some idle issues that I didnt really care about in the first place.
Inside the car, harder to hear, you can see the RPM jump when it stops :
Any ideas? I think I might try another dealership nearby... Theres no CEL for now but that noise wasnt there before so i'm a bit worried.