Problem W204
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Joined: Dec 2010
Posts: 75
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Mercedes Benz C300 sold , Passat CC 2010 Quad Exhaust sold , Mercedes Benz C63 2009
Problem W204
Hey Fellas
I got this problem with my W204 2009
Look at the rpm when I break the rpm goes up alone while it suppose to down with the speed odometer
any solutions ??
I got this problem with my W204 2009
Look at the rpm when I break the rpm goes up alone while it suppose to down with the speed odometer
any solutions ??
Senior Member
Joined: Apr 2013
Posts: 449
Likes: 1
From: Vancouver Canada
2010 C250 4Matic
Hey Fellas
I got this problem with my W204 2009
Problem with w204 - YouTube
Look at the rpm when I break the rpm goes up alone while it suppose to down with the speed odometer
any solutions ??
Problem with w204 - YouTube
I got this problem with my W204 2009
Problem with w204 - YouTube
Look at the rpm when I break the rpm goes up alone while it suppose to down with the speed odometer
any solutions ??
Problem with w204 - YouTube
Member
Joined: May 2013
Posts: 225
Likes: 0
C250 2012
Perfectly normal, your car is automatic so it's downshifting through the gears, the gear ratios change as the car downshifts so the engine RPM has to go up to match it.
It's the opposite when you are accelerating, the engine RPM drops as the car upshifts.
It's the opposite when you are accelerating, the engine RPM drops as the car upshifts.
Thread Starter
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Joined: Dec 2010
Posts: 75
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Mercedes Benz C300 sold , Passat CC 2010 Quad Exhaust sold , Mercedes Benz C63 2009
But
But sometimes it will do this alone in Park mode ,and the gear ratio RPM goes up and down like I am accelerating for 1 - 2 seconds , you think this is NORMAL
I own this car for 4 years so I already knows the normal things
I own this car for 4 years so I already knows the normal things
Thread Starter
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Joined: Dec 2010
Posts: 75
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Mercedes Benz C300 sold , Passat CC 2010 Quad Exhaust sold , Mercedes Benz C63 2009
now it drive me crazy , sometimes when i am stopped , the rpm goes vooov like iam preparing for a race, stupid isn't it !
by the way , I installed on my car some modified parts , like x-pipe , AMG exhaust system
and recently changed the ac compressor
thanks for the replies guys but any other solution ?
by the way , I installed on my car some modified parts , like x-pipe , AMG exhaust system
and recently changed the ac compressor
thanks for the replies guys but any other solution ?
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MBWorld Fanatic!
Joined: Oct 2010
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From: Acapulco Mexico
2010 C300 Sport
Could be many things: Injector stuck open, MAF misreading, bad signal from an 02 sensor, leak in the intake system, problem with the crankshaft sensor. The computer should throw a code which a MB dealership or a highly qualified shop can diagnose. Best of luck.
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Joined: Dec 2010
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Mercedes Benz C300 sold , Passat CC 2010 Quad Exhaust sold , Mercedes Benz C63 2009
if I took it to the stealer , they will rip me off even if it's small as a ring
that's why I came to my family here asking for help
if none make sense after I would take it and cry
that's why I came to my family here asking for help
if none make sense after I would take it and cry
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Joined: Oct 2010
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From: Acapulco Mexico
2010 C300 Sport
The M272 3.0L engine has a variable length intake manifold, however this would only affect the intake running the engine under speed, not a runaway idle. Even if it is a sensor, this may not always throw a code. Complicated.
As for MB dealers, my closest one is nearly three hours away. Worth every minute of the drive however, the service a Stuttgart Motors Cuernavaca is fantastic with fair prices for their excellent service. Maybe there is a better MB service department in your area, if you can you should check
As for MB dealers, my closest one is nearly three hours away. Worth every minute of the drive however, the service a Stuttgart Motors Cuernavaca is fantastic with fair prices for their excellent service. Maybe there is a better MB service department in your area, if you can you should check
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Mercedes Benz C300 sold , Passat CC 2010 Quad Exhaust sold , Mercedes Benz C63 2009
Acapulco Bill , You mentioned the Mainfold Intank , this part goes above the engine , I have changed this one last couple of months with an OEM Mercedes Part , and As I tell you it won't give a code , so I have no way to figure it by Xentry , and the closest dealer is only 10 minutes driving , but will cost muuuuuuch as u know , and already did a complete service , even spark plugs and cleaned the air sensor gate
but do you think this is caused by the Xpipe I installed ??
Any chances
but do you think this is caused by the Xpipe I installed ??
Any chances
MBWorld Fanatic!
Joined: Oct 2010
Posts: 1,128
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From: Acapulco Mexico
2010 C300 Sport
"...cleaned the air sensor gate...", just got another GM car back from the shop with this problem, the engine would rev at about 2000 RPM, making driving the car unsafe. Perhaps the cleaning caused the problem or didnt fix it. I would suspect this first, the MB dealer should check and/or fix this for free if this service was listed on your bill.
It is rare but perhaps one of the pre or post cat 02 sensors became intermittent with the Xpipe install. This would not throw a code, just output bad data to the ECU. Had this problem on my exotic V12 after installing Magnaflows.
Unfortunately if the 02 sensor causes excessive fuel input, this can cause excess hydrocarbons to go through the exhaust to the cat, and an 02 sensor failure can result.
So take care of this irregularity ASAP, whatever the source.
It is rare but perhaps one of the pre or post cat 02 sensors became intermittent with the Xpipe install. This would not throw a code, just output bad data to the ECU. Had this problem on my exotic V12 after installing Magnaflows.
Unfortunately if the 02 sensor causes excessive fuel input, this can cause excess hydrocarbons to go through the exhaust to the cat, and an 02 sensor failure can result.
So take care of this irregularity ASAP, whatever the source.
