1 to 2 shift
Thread Starter
MBWorld Fanatic!
Joined: Jun 2003
Posts: 4,705
Likes: 2
From: nj
a car that can't do the throttle reset.
1 to 2 shift
in my ml i have a very hard thud when driving slow...it happens from first to second gear. any fixes? is this a serious problem?
ive heard there is a bulletin about this issue in the ml's.
ive heard there is a bulletin about this issue in the ml's.
Super Member
Joined: May 2004
Posts: 755
Likes: 2
From: USA
LS7 powered Corvette
Definitely not the converter lockup clutch. At slow speeds in second gear, if the lockup clutch is locked, you would most likely be doing less than 15-20mph with no torque multiplication from the converter. The truck would feel like a dog when accelerating.
If it is a hard thud... it could be a trans problem like valve body or the clutch pack, or even a cracked/broken engine/transmission mount.
If it is a hard thud... it could be a trans problem like valve body or the clutch pack, or even a cracked/broken engine/transmission mount.
Super Member
Joined: Jan 2004
Posts: 538
Likes: 2
From: Silicon valley
Audi C7.5 S6
How hard of a thud is it?
If a delay accumulator filled too fast in the valve body, one could have this problem. This would feel like a shift kit in a very aggressive programmed valve body.
There is normally a pressure regulator, to limit pressure in valve body fluid circuits, if a piston was sticking, you might feel, this problem
I had a higher stall converter in a Ford, when, the converter locked at slow speed speed, it would have a very annoying thud. I had it changed (ECU) to not lockup below 45mph, no more thud.
If a delay accumulator filled too fast in the valve body, one could have this problem. This would feel like a shift kit in a very aggressive programmed valve body.
There is normally a pressure regulator, to limit pressure in valve body fluid circuits, if a piston was sticking, you might feel, this problem
I had a higher stall converter in a Ford, when, the converter locked at slow speed speed, it would have a very annoying thud. I had it changed (ECU) to not lockup below 45mph, no more thud.
Thread Starter
MBWorld Fanatic!
Joined: Jun 2003
Posts: 4,705
Likes: 2
From: nj
a car that can't do the throttle reset.
m444, the thud is noticeable to passengers as well... it seems as though it happens when driving slow in a parking lot when looking for a parking spot. cars in 1st...then rpm rise...feels like should shift to 2nd but doesnt til later on...then after rpms rise some more, then clunk! into second with a thud.
Super Member
Joined: Jan 2004
Posts: 538
Likes: 2
From: Silicon valley
Audi C7.5 S6
It does sound like a sticky piston in the valve body. Pressure builds, but piston does not move until, full pressue is reached, then slam.
Time for a fluid change and overhaul of the valve body.
Find someone that really knows MB automatics.
Time for a fluid change and overhaul of the valve body.
Find someone that really knows MB automatics.
Trending Topics
Thread Starter
MBWorld Fanatic!
Joined: Jun 2003
Posts: 4,705
Likes: 2
From: nj
a car that can't do the throttle reset.
Originally posted by m444
It does sound like a sticky piston in the valve body. Pressure builds, but piston does not move until, full pressue is reached, then slam.
Time for a fluid change and overhaul of the valve body.
Find someone that really knows MB automatics.
It does sound like a sticky piston in the valve body. Pressure builds, but piston does not move until, full pressue is reached, then slam.
Time for a fluid change and overhaul of the valve body.
Find someone that really knows MB automatics.
MB World Stories
The Best of Mercedes & AMG
8 Oddball Mercedes Ideas That Actually Made it to Production
Verdad Gallardo
Dubai Tuner Gives the Mercedes G-Class An Entirely New Look
Verdad Gallardo
Six Gift Ideas Your AMG Loving Dad or Grad Will Cherish
7 Craziest Things AMG Gas Ever Built
Verdad Gallardo
New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know
Verdad Gallardo
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
Super Member
Joined: May 2004
Posts: 755
Likes: 2
From: USA
LS7 powered Corvette
The reason I said engine mount is because I personally have had two ML, one a 430 and one a 500 that had a broken driver side engine mount. The two pieces brake apart and it makes a thud like that. Maybe suggest that two them.... or you can check it yourself. You will need two people, put the car in drive with the parking brake applied. Then hold your left foot on the brake and give it gas with your right. If you notice excessive torqueing of then engine, it shouldn't move that much, that is your problem. Just a suggestion.
Newbie
Joined: Jun 2004
Posts: 11
Likes: 1
From: Somewhere near the cooling towers
2002 CLK55 Cab & W213 E300
sounds like thers a fluid blockage somewhere, happend in my old car, felt like your dumping the clutch on a standard trans @ over 5k rpm right? I'm no tech, but I could suggest having the fluid checked for metalic shavings etc...if thats the case then you may need a new trans.
Thread Starter
MBWorld Fanatic!
Joined: Jun 2003
Posts: 4,705
Likes: 2
From: nj
a car that can't do the throttle reset.
Originally posted by fixedhalo
sounds like thers a fluid blockage somewhere, happend in my old car, felt like your dumping the clutch on a standard trans @ over 5k rpm right? I'm no tech, but I could suggest having the fluid checked for metalic shavings etc...if thats the case then you may need a new trans.
sounds like thers a fluid blockage somewhere, happend in my old car, felt like your dumping the clutch on a standard trans @ over 5k rpm right? I'm no tech, but I could suggest having the fluid checked for metalic shavings etc...if thats the case then you may need a new trans.
Super Member
Joined: Jan 2004
Posts: 538
Likes: 2
From: Silicon valley
Audi C7.5 S6
I would not expect the motor mount to fail, unless, it was defective or very old.
Put it in first gear, accellerate and de-accellerate, you should feel it knock, if it's the motor mount..
If it's under warranty, the dealer should fix it..
One could always get another opinion, different dealer or a reputable trans shop.
Put it in first gear, accellerate and de-accellerate, you should feel it knock, if it's the motor mount..
If it's under warranty, the dealer should fix it..
One could always get another opinion, different dealer or a reputable trans shop.
MBWorld Fanatic!
Joined: Jun 2003
Posts: 3,347
Likes: 0
From: Orlando
E550 Coupe
The dealers never seem to fix bad motor mounts. Search through the W208 section - MANY went to their dealers reporting unusual steering wheel vibration at idle. None of the dealers fixed it and they all said that it was "normal." I guess a few of them took it to an independent shop and got it fixed there. I figured the vibration was normal so didn't bother to tell my mechanic about it but I went on vacation, left my car with my Sister, she drove it and told my mechanic about the vibrations, he saw that it was torn to pieces and replaced it.
