[BOTONOSI]

My ML has now around 100.000 km. Before 1 month i noticed that when i was accelerating the engine hard after a while i had reduce in power and a vibration feeling of the engine.When i shut off and turn on the engine everything was normal except when i was accelerating hard e.t.c.
The dealer changed my cables of the spark plugs. The problem was excisting.
I my self changed the spark plugs...
I went to the dealer and the diagnostic showed that the cylinder Nr 1 had missfires.... He told me that the vibration is because when there is a missfire or anyway a problem to a cylinder of the engine the car' s computer isolate and stop any activity to this cylinder for preventing any further damage....
He put inside the gas tank an additive to clean the benzin hoses (becks) but....

The problem exists...and i noticed today that 9 to 10 times when i accelerate in a speed over 200 km/h i have the same effect....Vibration again and loss of power...

My opinion is that maybe the multiplier of the 1st Cylinder has malfunctions when needs to produce high voltage (in hard accelerations and in high speeds).

Has anyone of you any idea what the problem is?

 

[Panzer Man]

My ML has now around 100.000 km. Before 1 month i noticed that when i was accelerating the engine hard after a while i had reduce in power and a vibration feeling of the engine.When i shut off and turn on the engine everything was normal except when i was accelerating hard e.t.c.
The dealer changed my cables of the spark plugs. The problem was excisting.
I my self changed the spark plugs...
I went to the dealer and the diagnostic showed that the cylinder Nr 1 had missfires.... He told me that the vibration is because when there is a missfire or anyway a problem to a cylinder of the engine the car' s computer isolate and stop any activity to this cylinder for preventing any further damage....
He put inside the gas tank an additive to clean the benzin hoses (becks) but....

The problem exists...and i noticed today that 9 to 10 times when i accelerate in a speed over 200 km/h i have the same effect....Vibration again and loss of power...

My opinion is that maybe the multiplier of the 1st Cylinder has malfunctions when needs to produce high voltage (in hard accelerations and in high speeds).

Has anyone of you any idea what the problem is?

If what you are calling a multiplier is the ignition coils for # 1 cylinder I think you are correct. Coils do go bad with time. I would look into that for sure!!

 

[roadsession]

Hellas Botonosi

Panzer man is right. It's probably the 'coil pack'.
It's not a very expensive fix.

 

[BOTONOSI]

Thank you Panzer man and roadsession.This might be.Tomorrow i will buy a coil for the #1 cylinder and when i test this i will inform you
Also i noticed that when i accelerate till 100 km/h hard and then smoothly till over 200 km/h i have no any effect... The machine works perfectly.
But when i accelerate hard and especially around 120 km/h with the kick down i have this effect of loss of the engine power...

 

[BOTONOSI]

END OF STORY?

Before some hours i replaced the the ignition coil for #1 cylinder.
I tested the car in the city with hard accelerations e.t.c. NOTHING HAPPENED !!! NO STALLED CYLINDER....

Tommorow i will drive the car in the highway.... for final results....
I will inform you....

 

[jdrmlbenz06]

My ML has now around 100.000 km. Before 1 month i noticed that when i was accelerating the engine hard after a while i had reduce in power and a vibration feeling of the engine.When i shut off and turn on the engine everything was normal except when i was accelerating hard e.t.c.
The dealer changed my cables of the spark plugs. The problem was excisting.
I my self changed the spark plugs...
I went to the dealer and the diagnostic showed that the cylinder Nr 1 had missfires.... He told me that the vibration is because when there is a missfire or anyway a problem to a cylinder of the engine the car' s computer isolate and stop any activity to this cylinder for preventing any further damage....
He put inside the gas tank an additive to clean the benzin hoses (becks) but....

The problem exists...and i noticed today that 9 to 10 times when i accelerate in a speed over 200 km/h i have the same effect....Vibration again and loss of power...

My opinion is that maybe the multiplier of the 1st Cylinder has malfunctions when needs to produce high voltage (in hard accelerations and in high speeds).

Has anyone of you any idea what the problem is?

Sounds like the Mass Airflow Sensor. I had the same problem on my ml320 & ml430. The dealer charges close to $500, but there is a place in CT that sells it for $169.00.

 

[BOTONOSI]

No my friend ... It is not definetely the MASS sensor...

Usually when you have only in one specific cylinder missfire is the ignition coil of this cylinder....(please read my previous post)

My technician told me that when you have randomly missfires to your cylinders that means that is time to replace your catalytic converters !!!!

Anyway tommorow i will make the full test of the engine in the highway ... with hard accelerations ,trying to reach maximum speed of the car e.t.c. and i will inform you.Just to know all of us what in the hell are these missfires!!!!



FYI I had replace the MASS sensor recently for other reason and the problem was existing...

 

[BOTONOSI]

FINALLY COMING BACK FROM MY WORK IN AN OPEN ROAD I ACCELERATED HARD AND AGAIN IN 120 KM/H GUESS WHAT?


M I S S F I R E !!

SO IT WASNT THE IGNITION COIL !!!!

WHAT IN THE HELL IS ?
ANYONE KNOWS ?

EXCEPTIONS :

1. MASS SENSOR (Brand new)
2. SPARK PLUGS (Brand new)
3. IGNITION COIL (Brand new)

 

[MOUSE]

Sounds like lack of!

Could it be the fuel injectors. Run high octane and or fuel conditioner. Open the air flow line and spray in injector cleaner. Then take on the highway for a test run!

What fuel do you burn? Try other brands

 

[jabus]

Doing a search, one guy said , his problem was, a blocked catalist, im having the same problem? so im interested in this fault, one guy who i work with had the same fault, on a mercedes 180, he found the fault to be, the mass air unit,.
Why does this problem, keep cuming on the forum, as it seems a common fault? and can be a very expensive one , ie plugs ,leads, coils, mas air units , etc etc, surley theres one route to the problem,
I own a ml 320 ,1998, with 62000, on the clock, which is low , for the age ,of the car, but i should drive it , longer, and harder than i do.
regards,
please keep me posted on the problem, and i hope, things dont get worse. i checked the pressure, by hand, on the exhaust, and there seems to be, a good pressure, coming out when, reving the car, so i dont think, its the cat blocked

 

[Panzer Man]

FINALLY COMING BACK FROM MY WORK IN AN OPEN ROAD I ACCELERATED HARD AND AGAIN IN 120 KM/H GUESS WHAT?


M I S S F I R E !!

SO IT WASNT THE IGNITION COIL !!!!

WHAT IN THE HELL IS ?
ANYONE KNOWS ?

EXCEPTIONS :

1. MASS SENSOR (Brand new)
2. SPARK PLUGS (Brand new)
3. IGNITION COIL (Brand new)

You don't say what year or model ML you have. My 2000 ML 430 would not run over 120 MPH/196KPH because it came with H rated tires and was governed by the computer to not go any faster. My current 05 ML500 SE will go faster as it has V rated tires. Maybe your truck is just governed at 200KPH. Where do you drive that fast in your country??

 

[BOTONOSI]

Just FYI My ML is a ML430 model year 2000 tuned by BRABUS to a 5.8 engine ...

Also i added inside the gasoline tank an additive for cleaning fuel injectors.
THE PROBLEM ALWAYS EXISTS !!! M I S F I R E

So because i lost my trust to the stealers ..... They only know to take money ...
I left my ML to a special non Mercedes technician (in his area they say "he was born inside an engine !!!) who promised me that he is gonna solve this misfire problem...

If you make a search in internet (through google for example) using the keywords "misfire"+ "mercedes" you will be suprised !!! A LOT OF OWNERS OF MERCEDES CARS HAVE THE SAME PROBLEM WITHOUT ANY SOLUTION!!!
And because i see that i have over 200 views in my topic (i suspect similar problems) i promise you that i will publicate the solution of this misfire problem when my car is fixed from this technician....

Be patients...

To be conitnued...

 

[ttaleric]

So your getting CEL's? that tell you what cyl is missfiring?

 

[Wolfgang]

Just FYI My ML is a ML430 model year 2000 tuned by BRABUS to a 5.8 engine ...

Also i added inside the gasoline tank an additive for cleaning fuel injectors.
THE PROBLEM ALWAYS EXISTS !!! M I S F I R E

Hello BOTONOSI, so you have a Brabus 5.8 with these numbers:

BRABUS 5.8, for ML 430, 400 hp / 294 kW, 597 Nm, 240 km/h

Since it differs quite a bit from a factory configuration 2000 ML430 I would suggest to contact Brabus and see if they can resolve the misfire. It might have something to do with the reprogrammed/tuned engine controller, reset fuel pressure or mixture preparation, etc. etc.

 

[BOTONOSI]

Yes Wolfgang, that is my baby....
FYI just to let you know these guys of BRABUS are working like snails.Believe me.After sale they dont care so much.Also the Mercedes software is full compatible with their modifications.

Anyway my "guru" technician" will find it.I have very big confidence to him. He is a dragster developer and racer and for me the best technician in Greece....

The only thing all we need is patience....

From Monday i will inform you for the development of the project "Missfire"

The only thing all we need is patience....

 

[BOTONOSI]

Latest news....

My friend (the technician) just told me that the fuel injectors are ok...
The engine compression is perfect...

So his last investigation is to check the engine controller tommorow with his palmograph and all the appropriate equipment...It seems Wolfgang that your estimation is going to be true....

JUST PATIENCE .Tommorow we ll know

 

[elbello]

Problems with ML's

BOTONOSI
I received a letter from Mercedes, this was the first paragraph:

"Dear Mercedes Benz Owner,
Your vehicle is equipped with a harmonic balancer pulley on the front of the engine's crankshaft which drives a serpentine belt that powers the altenator, power steering pump, air conditioner and other vehicle accesories. Due to a supplier quality problem the harmonic balancer pulley in certain model year 1998-2001 vehicles may, depending on vehicle characteristics, be subject to high underhood temperatures that can, over a long period of time, cause it to deteriorate. Prior to a harmonic balancer pulley deteriorating to a point of affecting vehicle performance and drivabiliry, it will create several different types of driver warnings such as noticeable engine vibrations."

Im getting the vibration problem and engine power loss when I accelerate hard too, so I'm taking it to the dealer to change that harmonic balancer pulley. They will service that problem for free. Try looking into that, it might be the cause of the problem.
They had a service campaign for it, it is #2005-02003.
I don't know if that's for all mercedes dealers around the world or not, but you can sure ask.

 

[dfskinner]

MAS for 169? Can you tell us where?

Thanks,

 

[BOTONOSI]

AND FINALLY MY EXPERT TECHNICIAN FOUND WHAT WAS THAT "M I S S F I R E" PROBLEM........

My ML now run like the wind without any idiots " missfire" !!!!

IT IS LIKE NEW ONE !!!
WE TESTED THE ML A FULL DAY WITH FULL AND HARD THROTTLE AND NO "MISSFIRE"!!!!


Because i want to know how many of you, owners of Mercedes cars have the same problem BEFORE I announce the SOLUTION i am waiting post from you...

Just for statistic reasons only....

***GREECE EUROVISION 2006 ****

 

[Wolfgang]

AND FINALLY MY EXPERT TECHNICIAN FOUND WHAT WAS THAT "M I S S F I R E" PROBLEM........

My ML now run like the wind without any idiots " missfire" !!!!

IT IS LIKE NEW ONE !!!
WE TESTED THE ML A FULL DAY WITH FULL AND HARD THROTTLE AND NO "MISSFIRE"!!!!


Because i want to know how many of you, owners of Mercedes cars have the same problem BEFORE I announce the SOLUTION i am waiting post from you...

Just for statistic reasons only....

***GREECE EUROVISION 2006 ****

Glad your problem is fixed, BOTONOSI. My guess is either a software update, or ignition coils and harnesses, or maybe a plugged fuel filter...