Rattle during acceleration

[jetfuel]

it could but if it is the plastic frame from the dealer it is screwed right into the back panel...plastic...

jetfuel...screw driver time bud...Where are those ice cubes at?

[dvskier]

I guess so but it is only secured on top, thats why I was wondering. you are right though about the plastic.

[jetfuel]

...secure the bottom with some double backing tape and give it a try...

jetfuel...get'r'done

[dvskier]

It's worth a try, thanks.

[HGB]

Is the engine getting hi-test at all times? Just a thought.

[Quagmire]

I had the same rattle (buzzing sound) on acceleration. Turned out to be the top frame of the rear window. Have someone put their hand on it when your driving. I put a felt pad between it and the glass; to solve the problem.

Drove me nuts... I thought it was a heat shield or loose licence plate.

[dvskier]

Always gets premium.

[HGB]

When the smart is driven gently and the transmission chooses 5th gear early to save gas, any acceleration then will cause a resonating on various components. An example would be a vibrating mirror.
If the transmission would be dropped to the next lowest gear, the engine rpm would rise a bit and the rattling may stop.
I have a little MAZDA B2000 truck and when I shift to a high a gear at a low speed, the little 4 banger with minimal torque causes the whole interior to vibrate so harshly that I must immediately drop down to the next gear. I wonder if this phenomenon is your problem, especially since the dealer is not concerned.

[Duckhunter]

I am sure that is it with mine. Only at low speed on takeoff moving slowly. This car has a lot of parts that are not bolted and it can be just a little noisy at times.

[davy12]

I have the same buzzing. It happens when I wind out the engine before shifting. It happens around 3500 rpm and you can hear it outside of the car. I looked around and if I tap on the intake I hear a sound that is similar. Has anyone found anything?