- Mercedes-Benz C-Class: Why is My Car Losing Power
Guide to diagnose trouble and recommended solutions
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My car loses power at 50k rpm, anyonelse had this problem???
One of the symptoms is, when I accelerate using the kick down button the car runs up to about 50k rpms and starts losing power like if it was running out of gas.
My mpg's have dropped from 27 to 22hw and 23 to 19 street.
I have recently changed the fuel filter about 2 months ago and also the spark plugs as well as one of the coils in november of 2012.
Thank you for taking time to read this long post I appreciate your replies in advance.
One of the symptoms is, when I accelerate using the kick down button the car runs up to about 50k rpms and starts losing power like if it was running out of gas.
My mpg's have dropped from 27 to 22hw and 23 to 19 street.
I have recently changed the fuel filter about 2 months ago and also the spark plugs as well as one of the coils in november of 2012.
Thank you for taking time to read this long post I appreciate your replies in advance.
When you rev your engine to 50,000 rpm, it starts to lose power? I'm surprised the engine did not grenade itself!
I'm going to assume you meant 5,000 rpm or 5K rpm. You mentioned that your check engine light is on. Instead of going with your friend's interpretation.
Can you borrow an OBDII code scanner from somewhere and get all the codes and post them here? Some autoparts store are willing to check them for free!
When you rev your engine to 50,000 rpm, it starts to lose power? I'm surprised the engine did not grenade itself!
I'm going to assume you meant 5,000 rpm or 5K rpm. You mentioned that your check engine light is on. Instead of going with your friend's interpretation.
Can you borrow an OBDII code scanner from somewhere and get all the codes and post them here? Some autoparts store are willing to check them for free!
P0171 Generic
System Too Lean(Bank 1)
Possible causes could be:
1) Intake air leak or vacuum leak after the Mass Air Flow sensor. (This is a may be as usually you'd also get a code for Bank 2 also)
2) Bad upstream O2/Lambda sensor for Bank 1.
May be someone else can chime in on other possibilities.
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Edit: Just called an MB Service Dept. The recall was never done. Got an appointment on Monday to replace the Cam Shaft Solenoid.
Last edited by Leftcoast_yg; Mar 23, 2013 at 06:05 PM.









