S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

2007 Mercedes S550 W221 Misfiring problem.

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old Jul 28, 2016 | 11:58 PM
  #1  
nasdaqtr's Avatar
Thread Starter
Newbie
 
Joined: Oct 2010
Posts: 2
Likes: 0
s550
2007 Mercedes S550 W221 Misfiring problem.

I recently had problems with my car. I replaced starter, prefuse box, crankshaft sensor, new spark plugs and two coils and finally had to get the ECU repaired by getting both in and out drivers replaced inside. This made the car start and the check engine light went away.

The car does not give any code or the check engine light does not come up but the engine has rough idle and sometimes you feel kicks and misfiring when stopped at the red light. The check engine light does not come up.

Can anyone suggest what could be wrong here or has experienced similar problem?
Reply
Old Jul 29, 2016 | 06:02 AM
  #2  
sloanbj's Avatar
Senior Member
15 Year Member
Liked
 
Joined: Oct 2006
Posts: 261
Likes: 8
From: NorCal / Latin America
'72 Fleedwoot
Intake manifold? Fuel pump?
Reply
Old Jul 29, 2016 | 10:57 AM
  #3  
nasdaqtr's Avatar
Thread Starter
Newbie
 
Joined: Oct 2010
Posts: 2
Likes: 0
s550
But shouldn't that throw codes on check engine?
Reply

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


You have already rated this thread Rating: Thread Rating: 0 votes,  average.


All times are GMT -4. The time now is 12:34 AM.

story-0
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-1
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-2
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-3
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-4
Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE
story-5
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

Slideshow: Mercedes is turning one of its core nameplates electric, and the details show just how serious this shift is.

By Verdad Gallardo | 2026-04-21 13:58:06


VIEW MORE
story-6
Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


VIEW MORE
story-7
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


VIEW MORE
story-8
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


VIEW MORE
story-9
10 Most Reliable Mercedes-Benz Models You Can Buy Used

Slideshow: From bulletproof sedans to surprisingly tough SUVs, these Mercedes models proved that the three-pointed star can go the distance.

By Verdad Gallardo | 2026-04-08 09:55:49


VIEW MORE