LILBENZ230

I had a 2005 C230K, a 2009 E350, a 2011 C300, and a 2014 C350 - all start in 2nd gear in E mode. The 2014 C350 had the same exact drivetrain as the E350.

Makes no sense.

Left Coast Geek

TH350 ? (googles), oh, the old GM 3-speed auto, putting the slush in slushbox since 1969? heh.

Arrie

Seems your thread got a bit side tracked since you really just want better gas pedal response, like so many others do too.

First, you can reset your TCU to get it out from the “granny” driving mode that it somehow learns to go to. Mine does the same thing, even my S550 does.

Reset procedure:

1. Get in the car and close all doors.

2. Turn key to position 2 or press the start button twice. KEEP YOUR FOOT OFF THE BRAKE PEDAL. You do NOT want to start the engine during this procedure.

3. Press the gas pedal all the way down and hold it.

4. After holding it for 10 seconds turn key to off position or press the start button once to turn all power off.

5. After power is off lift your foot from the gas pedal.

6. Wait for 2 minutes. Do not open doors or touch anything, just wait for 2 minutes. Time it!

7. After 2 minute wait open door.

8. Go drive and enjoy!

Problem with this procedure is that depending on your driving you need to do it again in a couple of weeks, but it works every time though.

Somewhat permanent fix is to install Sprint Booster or a like. I have Sprint Booster and it is awesome what it does. It practically eliminated the throttle lag and makes car a lot enjoyable to drive. Costs $300 and, at least in my car, is super easy to install as you just take two nuts off the gas pedal assembly and install sprint booster directly in the pedal assembly and then the car wire harness to the sprint booster.

I highly recommend this device if you only want to get rid of the gas pedal lag. And it makes the car feel like it has more power but I don’t think it does.

LILBENZ230

So strange we all want what we do not have. I don't need throttle amplification, I need it to be dialed back some. Others want things like sprint boosters that amplify the throttle signals.

Kalaeboi808

i just bought my 2012 E550 today was looking in to tunning it. Without breaking my bank... I'd pay up to 1000$.... And good advice please...Thank you

alan_e550

Weistec has the best tune in my opinion when it comes to the M278. Renntech is an option but is far less budget friendly. OETuning is an option too but Weistec really shows the engines power without sacrificing reliability.