A strange rocking feeling, like misfire
Thread Starter
Junior Member
Joined: Apr 2015
Posts: 60
Likes: 1
From: the USA
2004 Mercedes CLK55 AMG
A strange rocking feeling, like a misfire
When I stop the car (like at red light), there is an intermittent very light push, like a very light sideways rocking, coming from the engine. Maybe once in 2-3 minutes. My mechanic also felt it, he compared it to a minute misfire, he ran diagnostics and found NO codes. What could it be?
This is not felt when the car is moving.
This is not felt when the car is moving.
Last edited by sksvlad; Aug 8, 2015 at 11:38 PM.
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,308
Likes: 62
From: Bethesda, MD
2000 SL500
usually a plug or wire would throw a code...i would think it could be a very small vacuum leak, a fuel filter clogged, mass airflow sensor a little dirty(also would probably throw a code) or an engine or transmission mount failing (if its constant)
Senior Member
Joined: Dec 2014
Posts: 391
Likes: 14
From: Orlando, FL
05 CLK55 AMG (1 of 247) Cubanitsilber designo series
I'd check the torque on the plugs first. If the plugs were not torqued properly it's not unusual to find a loose one. Also, if the threads are gunked up with oil or anti seize you can get a misfire at idle. If your valve covers or breather box covers are leaking you can get enough oil and crap on the coils to cause a misfire at idle.
Member
Joined: Nov 2024
Posts: 152
Likes: 43
From: New Jersey/Philly
2010 E350 Coupe
How many miles/km on the car? Mine is a C207 rather than W212, but at just over 100k mi EVERYTHING in the rear was completely destroyed. I was actually in denial. I've never needed to do rear suspension on any car I've ever owned, amd when I did, it was barely noticeable & the car was out of my hands before it was an issue.
With this car, it literally feels like my subframe isn't bolted in. Brand new subframe, perfectperfectly round wheels, current Conti tires, yearly alignments, new Bilstein B4's, factory springs, end links, spring control arm bushings....means nothing. ALL of the control arms are DEAD. And you guessed it, I've had people look at it when I 1st noticed the feeling (as again, I simply could not believe it at this mileage), & naturally nothing was obvious to them, as they're looking for huge gashes and chunks of missing rubber rather than fair hairline cracks & disturbances.
If 212 rear suspension is anywhere near as laughably horrendous as 207 rear suspension, you probably need everything back there like I do regardless of me never pushing this car anywhere near it's limit. Check the condition of EVERY bushing as @TimC300 noted.
With this car, it literally feels like my subframe isn't bolted in. Brand new subframe, perfectperfectly round wheels, current Conti tires, yearly alignments, new Bilstein B4's, factory springs, end links, spring control arm bushings....means nothing. ALL of the control arms are DEAD. And you guessed it, I've had people look at it when I 1st noticed the feeling (as again, I simply could not believe it at this mileage), & naturally nothing was obvious to them, as they're looking for huge gashes and chunks of missing rubber rather than fair hairline cracks & disturbances.
If 212 rear suspension is anywhere near as laughably horrendous as 207 rear suspension, you probably need everything back there like I do regardless of me never pushing this car anywhere near it's limit. Check the condition of EVERY bushing as @TimC300 noted.
