Strange Loss of Power problem
Thread Starter
Junior Member
Joined: Nov 2011
Posts: 52
Likes: 3
2004 S600
Strange Loss of Power problem
I have a 2004 S600, pretty much stock with only K&N filters. About a month ago I started having this issue. The car starts up strong and runs very smooth. While it's cold it has what feels like full power. After it is warm, if I press the pedal down more than 1/2 or 3/4 it starts to move out with full power as if normal but then all of a sudden the power backs off. No stumbling or roughness just lower power. Its almost as if I'm pressing the pedel down all the way but the ECU is only letting the throttle open 1/4 or so. I can still go through all the gears and even get up over 80 eventually. I'm not getting error indications or codes at all. If I stop, shut down the engine and restart, it goes back to normal full power until the next time I slam the pedel down then the same thing happens. Any ideas on what could be giving me this problem?
Thanks,
Thanks,
Super Member
Joined: Sep 2012
Posts: 690
Likes: 76
From: Montreal, Quebec
2009 E350 4M Avantgarde;mistress 2002 S600; wife 2014 C300 4M
check the pressure at the fuel rail under the described condition to make sure the filter is ok; after that things get a little more complicated (such as exhaust back pressure).
good luck
good luck
Member
Joined: Oct 2008
Posts: 179
Likes: 2
From: Chicago, Naperville area
2005 Mercedes S600, 2004 Mercedes E500 4-Matic, 2002 Mercedes C32 AMG, 2001 Trans-Am WS-6
I have a 2004 S600, pretty much stock with only K&N filters. About a month ago I started having this issue. The car starts up strong and runs very smooth. While it's cold it has what feels like full power. After it is warm, if I press the pedal down more than 1/2 or 3/4 it starts to move out with full power as if normal but then all of a sudden the power backs off. No stumbling or roughness just lower power. Its almost as if I'm pressing the pedel down all the way but the ECU is only letting the throttle open 1/4 or so. I can still go through all the gears and even get up over 80 eventually. I'm not getting error indications or codes at all. If I stop, shut down the engine and restart, it goes back to normal full power until the next time I slam the pedel down then the same thing happens. Any ideas on what could be giving me this problem?
Thanks,
Thanks,
MBWorld Fanatic!
Joined: Dec 2012
Posts: 2,474
Likes: 439
From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
Perhaps your guess is possible - isn't the throttle on your car "fly-by-wire" - that is, not a mechanical connection between the pedal and throttle, but instead an electrically-operated, computer controlled throttle, based upon reading a pedal position sensor?
