engine noise??

[07WYarisRS]

Originally Posted by Pompeii66

I'm hearing this everyday when I back out of my driveway. I thought the same thing, sounds like a heatshield or something rattling for a couple of seconds. It's only in reverse and I only notice it when it's first started up.

The noise in reverce is annoying but normal and completely harmless

The cause it the exhaust and the way it's suspended under the car.
When the car is in forward or reverce it torques/twists the engine in one direction or the other. In forward the exhaust fits snug together, however in reverce they exhaust is being twisted againt it and a slight bit of rattling between the joints can be heard.
Don't worry about it, a lot of 4CYL/FWD cars do this