[Team_Smartcar]

Anyone's 453 run a bit rough at idle? I bought the car brand new and it wasn't this rough for the first 5k miles. I have tried different gas, etc asll the same. I took it to Mercedes of Sacramento and they said 2 things. 1 they have never even had a newer smart in there and 2 it was normal. If I rev it to like 1200 RPM's it is fine and smooth but just sitting at a light its definitely rumbling.

 

[ElementalDragon]

Anyone's 453 run a bit rough at idle? I bought the car brand new and it wasn't this rough for the first 5k miles. I have tried different gas, etc asll the same. I took it to Mercedes of Sacramento and they said 2 things. 1 they have never even had a newer smart in there and 2 it was normal. If I rev it to like 1200 RPM's it is fine and smooth but just sitting at a light its definitely rumbling.

Well, also have to keep in mind that it's only a 3-cylinder. Smarts do tend to idle on the odd side in my experience. I guess you could say less like butter, more like oatmeal with a touch too much milk. Just a bit lumpy.

On another note, getting your 453 straight-piped only makes it more obvious. Lol

Sent from my Pixel 3 XL using Tapatalk

 

[smart_gary]

I had the same concern with a new 453 (smart fortwo), and like yourself, my local dealer also assured me that it was normal for 3-cylinder engine in smarts. There's loads of articles on Internet explaining the reasons for vibration/imbalance on straight-three engines, and a bit of roughness/vibration at idle definitely seems to be normal. Hopefully you'll get used to it

 

[1stiski]

Our 453 idles smoothly . I have the Lorinser powerpack . I’m guessing that may have something to do with it . When I first installed the powerpack I had an electrical interference issue with the car running smoothly at idle. I had to re route some of the powerpack wires to the top of the stock harness to avoid the problem .. since I did that , the idle has been super smooth .