Backfire? when accelerating - Smart Car Forums
User Tag List

 2Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 11 (permalink) Old 07-03-2019, 06:22 AM Thread Starter
 
Join Date: Jun 2008
Location: Raleigh, NC
Posts: 12
Thanks: 0
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Backfire? when accelerating

I have a 2017 with about 12000 miles on it. Picked it up Dec 31 2016, and almost since day one my wife has been saying it backfires. Asked the dealer about it a couple of times but they found nothing, so I thought I would mention it here. I don't really usually notice it but my wife asks if I heard it that time frequently. The situation it happens 95% of the time is from a stoplight or a rolling stop at a light when turning left, about 3/4 of the way through the turn, especially if I ease off the gas it will make a sound not loud more like a putt and a little jerk. On occasion it will also happen when going straight from a light if the traffic moves then slows down and I need to take my foot off the gas and the put it back on. That is more like a stumble trying to pick a gear than when cornering though.

I suggested earplugs for my wife but she didn't like that idea
nyrken is offline  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old 07-03-2019, 07:12 AM
 
Join Date: Feb 2017
Posts: 82
Thanks: 0
Thanked 12 Times in 9 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
Turbo equiped??.................

I'm not familiar with the 2017 smart with turbo. I do know that most cars with a turbocharger on the engine have a
"waste-gate" also. That prevent overboosting,when you reduce the throttle suddenly. Makes a pop sound that you may
think is a backfire?? Any 453 owners want to comment...................
albertlastsmart is offline  
post #3 of 11 (permalink) Old 07-03-2019, 07:22 AM
Moderator
 
sokoloff's Avatar
 
Join Date: Aug 2013
Location: Ocean Isle Beach, NC
Posts: 1,135
Thanks: 76
Thanked 157 Times in 121 Posts
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 334 Post(s)
Garage
Quote:
Originally Posted by nyrken View Post

I suggested earplugs for my wife but she didn't like that idea
There's also the possibility of earplugs for you.

Len
2014 EV Coupe 18,000 miles
2014 EV Cabriolet 12,500 miles
Miss Mercedes and jzchen like this.
sokoloff is offline  
Sponsored Links
Advertisement
 
post #4 of 11 (permalink) Old 07-03-2019, 08:04 AM
 
Join Date: Dec 2012
Location: Arcadia, CA
Posts: 2,723
Thanks: 513
Thanked 283 Times in 250 Posts
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 560 Post(s)
Backfires, in the OLD days, usually meant bad gas. Is that a possibility here?

91 octane or higher, right, for the turbo? Mercedes, like most, also recommends top tier.

Either that or your car is running rich. Someone tune it before you got it? Vroom vroom!
jzchen is offline  
post #5 of 11 (permalink) Old 07-03-2019, 11:40 AM
Mod ♥ 450/451/453 + Motos
 
Miss Mercedes's Avatar
 
Join Date: Sep 2008
Location: IL-WI Border
Posts: 17,184
Thanks: 5,600
Thanked 2,337 Times in 1,637 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 164 Post(s)
Garage
My 451 occasionally backfires because the cylinder 1 spark plug is hilariously worn and it misfires. My 453 does not exhibit the problems you describe, so there's probably something going on in there. Sadly, this is one of those issues the dealership isn't likely to do anything about without a check engine light. And it seems the threshold before a misfire causes a CEL is pretty big.
Miss Mercedes is offline  
post #6 of 11 (permalink) Old 07-03-2019, 11:47 AM
 
Join Date: Aug 2007
Location: miami
Posts: 233
Thanks: 4
Thanked 39 Times in 17 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
gas

Had 1 misfire one time.
I use only Shell high octane even if its more expensive.
rubyg is offline  
post #7 of 11 (permalink) Old 07-04-2019, 08:33 PM
 
Join Date: Mar 2019
Posts: 4
Thanks: 0
Thanked 5 Times in 3 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
When this happens, are you driving in economy mode?
prpixel is offline  
post #8 of 11 (permalink) Old 07-05-2019, 03:50 AM Thread Starter
 
Join Date: Jun 2008
Location: Raleigh, NC
Posts: 12
Thanks: 0
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Good gas

Quote:
Originally Posted by jzchen View Post
Backfires, in the OLD days, usually meant bad gas. Is that a possibility here?

91 octane or higher, right, for the turbo? Mercedes, like most, also recommends top tier.

Either that or your car is running rich. Someone tune it before you got it? Vroom vroom!
I got the car New custom ordered 3 days after my 2008 was rear-ended at a stoplight. Since day one only filled with Shell V-Power NiTRO+ 95% of the time at the same station. I think the turbo gate, it it has one, could be it though. To me it does not sound loud enough to be a backfire.
nyrken is offline  
post #9 of 11 (permalink) Old 07-05-2019, 03:56 AM Thread Starter
 
Join Date: Jun 2008
Location: Raleigh, NC
Posts: 12
Thanks: 0
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Always economy mode

Quote:
Originally Posted by prpixel View Post
When this happens, are you driving in economy mode?
I always drive in Economy mode. I watch the mileage close so don't use Sport mode. That said If I don't run the air and catch all the lights I typically get 42-48 MPG on my way to work. If I have the air on and hit all the lights that will drop to 30-35. If I take the highway to work and run 65 I get between 45-50 MPG. Best I have gotten is from Raleigh to Santee SC for the eclipse 3 hour drive at 60mph got 52 MPG.
nyrken is offline  
post #10 of 11 (permalink) Old 07-05-2019, 09:32 AM
 
Join Date: Aug 2012
Location: Arizona
Posts: 4
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I had the same backfire problem with my 453. Manufactured 07/15. It also sometimes would pause when I needed to accelerate - especially when I needed to quickly make a left turn. Took it to the Mercedes dealer who though the backfire was the waste gate. Could not find any reason for the occasional hesitation on acceleration. So I sold it in September of 2018. For the OP, if the last digits of you VIN are 51527 you have the one I sold.

I replaced it with an electric Chevy Bolt EV. Love the acceleration, dependability, no gears to shift, no oil to change (or any other services to pay Mercedes prices for). We only have to rotate the tires, add windshield washer fluid and change the cabin filter). It even has a much lower cost per mile for fuel. Really miss the tight turning radius and attention the smart got from others.
shroyerjon is offline  
Reply

Tags
453 , backfire , jerk

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Smart Car Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome
 

Clubs, Garage Plus vBulletin Plugins by Drive Thru Online, Inc.