Improved shifting/acceleration
Thread Starter
MBWorld Fanatic!
Joined: Dec 2007
Posts: 3,056
Likes: 47
From: Orlando, Florida
E350 Sport/ML350RWD
Improved shifting/acceleration
Tried to go to work this morning and my battery was dead. I guess a didn't completely turn off the lights last night.
I was beyond angry when I figured out that I couldn't back my car out of the garage to jump start off of my truck. I guess it's a Mercedes thing?
Anyway. When I finally got my car started I noticed the shifting was smoother and the lag appears to be gone. Maybe it's my imagination but I am very aware of how my car performs, and I truly believe there is a VERY noticeable difference. Does complete electrical failure reset EVERYTHING? I know we can do the throttle reset, but this feels different than that. I know in my old Toyota, if I disconnected the negative and positive connections at the battery and left them off for at least an hour, it would reset the ECU.
Just a thought!
I was beyond angry when I figured out that I couldn't back my car out of the garage to jump start off of my truck. I guess it's a Mercedes thing?
Anyway. When I finally got my car started I noticed the shifting was smoother and the lag appears to be gone. Maybe it's my imagination but I am very aware of how my car performs, and I truly believe there is a VERY noticeable difference. Does complete electrical failure reset EVERYTHING? I know we can do the throttle reset, but this feels different than that. I know in my old Toyota, if I disconnected the negative and positive connections at the battery and left them off for at least an hour, it would reset the ECU.
Just a thought!
MBWorld Fanatic!
Joined: Aug 2009
Posts: 1,134
Likes: 8
From: Charlotte, NC
2015 BMW M235i 6MT
Interesting... Well if it resets the ECU, sucks for people with ECU tunes.
So the lag you're talking about, is it the lag where when you step and the gas hard you have to wait a second for it to start pulling? That's gone? Wow.
So the lag you're talking about, is it the lag where when you step and the gas hard you have to wait a second for it to start pulling? That's gone? Wow.
Super Member
Joined: Dec 2007
Posts: 648
Likes: 1
From: Seattle
C-300, XC70, Wrangler
You might invest in a small trickle-charge device that has a 12 v output. I have one that I can use to start the car while still in the garage. Has come in handy in the past when a car's battery decided to die (5 years old, dead cell, cold weather). These devices aren't very expensive and are safer than trying to jump start from another vehicle.
As to resetting the ECU, I doubt that. Most likely there's some dynamic RAM that lost charge and went blank. The ECU is most probably EPROM and won't be affected by a loss of power.
As to resetting the ECU, I doubt that. Most likely there's some dynamic RAM that lost charge and went blank. The ECU is most probably EPROM and won't be affected by a loss of power.
MBWorld Fanatic!
Joined: Nov 2008
Posts: 1,091
Likes: 4
From: Bandar Seri Begawan, Brunei
15 E200CGI SPORT
Well in my case, I've been driving in C for a period of time and a few days ago when i switched back to S the car seems to be alot more responsive and the throttle lag problem seems to be gone. Might be my imagination no?
Junior Member
Joined: Nov 2009
Posts: 21
Likes: 0
From: Midrand, SOUTH AFRICA
W204 C180K Avantgarde AT BE
I read somewhere possibly the manual) that the car "learns" your driving habits. So maybe when everything reset, it went back to a 0 learning stage hence everythings seems more responsive. I may also be talking alot of crap!
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
I don't know if the TCU has volatile memory but you might have ended up with a TCU back at it's default settings. If the car steadily goes back to it's old ways you will know you managed to wipe the TCU of it's learnings.
Trending Topics
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
There you go - back to default. Now it will learn it's bad habits again. It's been said many times. I wish we could switch between a few standard defaults & learning.
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
MBworld Guru
Joined: Apr 2002
Posts: 22,058
Likes: 18
From: Diamond Bar, CA
W206 PHEV AMG
reason for suspect is because my mom & pop tend to drive in comfort mode when they drive the 204 and I haven't notice it affecting my sport mode throttle pattern.
Junior Member
Joined: Nov 2009
Posts: 21
Likes: 0
From: Midrand, SOUTH AFRICA
W204 C180K Avantgarde AT BE
can one reset this learning (not by unplugging battery)- I mean if I want a sportier accelration, the car will have to re-learn or do I have to continue driving with a heavy accelrator so I can have quicker responses/acceleration?
MBworld Guru
Joined: Apr 2002
Posts: 22,058
Likes: 18
From: Diamond Bar, CA
W206 PHEV AMG
search throttle reset in w203 forum. same deal.
