Random misfire E420
Thread Starter
Senior Member
Joined: Apr 2009
Posts: 301
Likes: 0
1994 E420
Random misfire E420
So i have a misfire in my 420. The car runs and drives perfect when up to speed on the road, but when i come to a stop, it skips pretty bad, sometimes even surging. It also starts real rough when cold. So far i've replaced; Plugs, wires, distributors, and rotors. Also, i have inspected my wire harness and its in good condition. Could this be a problem with one of my coils? Any help is appreciated
Thread Starter
Senior Member
Joined: Apr 2009
Posts: 301
Likes: 0
1994 E420
Funny you should ask i have had a new therm. kit in my back seat for like a month i just havent gotten around to doing it yet. But that wouldnt be my problem....or would it??
MBWorld Fanatic!
Joined: Jun 2006
Posts: 4,968
Likes: 3
1990 300ce 24v I6
Probably not, but it may need doing anyway. I found that when my therm was bad my car ran much much nicer. It was running on the warmup mix constantly as the engine never got over 80C or so :P
Gimme the stats on your plugs sir, I am suspecting them.
Gimme the stats on your plugs sir, I am suspecting them.
Trending Topics
Thread Starter
Senior Member
Joined: Apr 2009
Posts: 301
Likes: 0
1994 E420
i know what your gunna say about my bosch plugs 
lol. But honestly, we use bosch plugs daily at my shop and we have never had a problem with them. Ignition wires are another story...
Im suspecting a coil that could be on its way out because the car runs perfect when rpms are over 1200.
lol. But honestly, we use bosch plugs daily at my shop and we have never had a problem with them. Ignition wires are another story... Im suspecting a coil that could be on its way out because the car runs perfect when rpms are over 1200.
MB World Stories
The Best of Mercedes & AMG
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
Thread Starter
Senior Member
Joined: Apr 2009
Posts: 301
Likes: 0
1994 E420
they are long gone, i threw all the old boxes out and have since made a dump run 
I will have to pull one out. But if it was the plugs it would have more of a constant skip even at higher rpms.
I will have to pull one out. But if it was the plugs it would have more of a constant skip even at higher rpms.
