noise while backing up

[07WYarisRS]

Many reasons
Air temps
Engine temps
Exhaust temps
Warm up time
Garage or kept out doors
Tooling and clearanace specs
Amount of enegine flex
flexability of exhaust hangers.

Slight differences between two cars that are basically the same, one might rattle the other does not.
The colder it is the more the exhaust can rattle until the metals heat up and expand.

it seems like every weeks someone posts about the rattle in reverce
I simply explained what it is that rattles...
My hatchback will only rattle if cold. If the engine has been running 4-5 mintes I don't have any rattle.

[iconcat]

Originally Posted by 07WYarisRS

Many reasons
Air temps
Engine temps
Exhaust temps
Warm up time
Garage or kept out doors
Tooling and clearanace specs
Amount of enegine flex
flexability of exhaust hangers.

Slight differences between two cars that are basically the same, one might rattle the other does not.
The colder it is the more the exhaust can rattle until the metals heat up and expand.

it seems like every weeks someone posts about the rattle in reverce
I simply explained what it is that rattles...
My hatchback will only rattle if cold. If the engine has been running 4-5 mintes I don't have any rattle.

Sorry to revive a long-dead thread, but you're right about the prevalence of the rattle and the accompanying fears of it. That's how I found this board, but as you describe it, I can tell that's what the deal is. Thanks for posting!