Missfire on ML55 AMG - please help
Thread Starter
Newbie
Joined: Mar 2006
Posts: 2
Likes: 0
From: UK
ML55 AMG
Missfire on ML55 AMG - please help
I have the engine check light on.
I am told it is a missfire on 4 & 8.
If I accelerate hard then the car missfires (almost stalling). If I switch the car off and back on again then it seems to reset until I accelerate hard again.
I have changed plugs, leads, coil packs & injectors and it hasn't changed.
I have also changed the MAF sensor and still no good.
Can anyone else help.
Many thanks
I am told it is a missfire on 4 & 8.
If I accelerate hard then the car missfires (almost stalling). If I switch the car off and back on again then it seems to reset until I accelerate hard again.
I have changed plugs, leads, coil packs & injectors and it hasn't changed.
I have also changed the MAF sensor and still no good.
Can anyone else help.
Many thanks
MBWorld Fanatic!
Joined: Jan 2005
Posts: 2,848
Likes: 15
From: Orange County
2005 C Wagon (No snickering please!)
There may be a bad engine wiring harness. I have not heard of this on a ML, but if the primary leads to the coil packs have hard, brittle, and/or cracking insulation, that might be the source of your misfire.
When you took out the old plug, were the deposits a nice toasty brown? That is a well working plug. If it was black, that might be fouling the plug causing the misfire. Sometimes this is caused by poor quality petrol (gasoline for the yanks.) This can be fixed by using a fuel system cleaner in the petrol tank. Look for a product with tolulene.
When you took out the old plug, were the deposits a nice toasty brown? That is a well working plug. If it was black, that might be fouling the plug causing the misfire. Sometimes this is caused by poor quality petrol (gasoline for the yanks.) This can be fixed by using a fuel system cleaner in the petrol tank. Look for a product with tolulene.
Senior Member
Joined: Mar 2006
Posts: 302
Likes: 0
From: Dublin, OH
05 ML350, 85 300D
2 things to check for this issue-
First, has the sensor gear adaptation been reset? It needs to be, especially on the MLs after fixing a misfire.
Second, if #1 cylinder is actually misfiring, then the computer gets confused and starts flagging other cylinders- seen this on a couple MLs.
Hope this helps
First, has the sensor gear adaptation been reset? It needs to be, especially on the MLs after fixing a misfire.
Second, if #1 cylinder is actually misfiring, then the computer gets confused and starts flagging other cylinders- seen this on a couple MLs.
Hope this helps
Trending Topics
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
Member
Joined: Aug 2003
Posts: 239
Likes: 0
From: Overhere
w210 e55
Did you recently disconnect or drain your battery? My car ran perfectly until that happened and now I am having the same issue with my 4 and 7 cylinders. We tried replacing coils, wires, plugs and injectors but still no luck. My car runs fine until you take it over 4k rpm and then it misfires really badly. If you shut it down and restart it the car is fine. Let me know what you find out.
PS How do you manually reset the DAS?
PS How do you manually reset the DAS?
Newbie
Joined: Sep 2006
Posts: 3
Likes: 0
Same misfire problem!!
Did you ever manage to sort out the misfire problem. I have a 2001 ML55 and have misfires in 4 out of 8 cylinders!! I was advised plugs/leads etc etc but before i do this the Merc dealer advised it might be water in the fuel range/gauge??!!
Did you ever sort the problem out.
Lordy
Did you ever sort the problem out.
Lordy
Newbie
Joined: Sep 2006
Posts: 3
Likes: 0
It seems to be just the same cylinders again and agin this time. I clear them then its 2 and 6 everytime withe the general misfire code too.
Prior to plugs, leads and Airflow meter it was ramdom....was misfiring on upto 4/5 of 8 cylinders.
Have tried using fuel cleaner over the weekend and using super unleaded as i it was suggested that the supermarket fuel i was using might not be helping.
The car is very jerky especially on the motorway at 80ish. It eventually gets to the stage that black smoke come out the exhaust until the cylinders all kick in then it goes.
Really stuck with this one!!!!!
Prior to plugs, leads and Airflow meter it was ramdom....was misfiring on upto 4/5 of 8 cylinders.
Have tried using fuel cleaner over the weekend and using super unleaded as i it was suggested that the supermarket fuel i was using might not be helping.
The car is very jerky especially on the motorway at 80ish. It eventually gets to the stage that black smoke come out the exhaust until the cylinders all kick in then it goes.
Really stuck with this one!!!!!
Junior Member
Joined: Sep 2006
Posts: 28
Likes: 1
00 E430 Sport
Newbie
Joined: Aug 2014
Posts: 9
Likes: 0
ML55 AMG
Got it fixed. Turned out to be the Catalytic Converters. Left front fell apart and the baffle went into the rear. Caused the rear to be backed up (plugged up) and created the misfire error. Not sure this will be the fix every time but before you replace your plugs/wires or start changing fuel components, take a few minutes and check the cats... Could save you a lot of time.
Junior Member
Joined: Sep 2014
Posts: 22
Likes: 0
From: New Jersey, Massachusetts
1999 E320 4Matic Sedan
Misfires misfires misfiring misfires
I would just do a straight base diag first to make sure you have air/fuel/spark/compression, if those all check out which they most likely will, id say then monitor some pid data while its happening, check your fuel trims, o2, ckp,cmp,maf, and any others you'd want to look at and try to find some abnormality. If you havent checked the fuel filter lately id do a pump volume test at the rail. If you recently unplugged anything such as the throttle body or any other electronic motors they may need adaptation. Id also check for any leaks in the intake system. Were there any other codes present relating to the engine?(rich/lean banks, signal/circuit codes, communication, ect.) check engine steady on or flashing?
