Question about 1996 Mercedes-Benz C-Class
You can remove all the injectors and have a close look. If they have done more than 50000kms you can think of replacing them as maybe it will be worth doing it earlier than to wait for more time.'
The fuel pump needs a good calibration and that seems to be the heart of the problem.
I suggest that you get this job done with an experienced center. If the pump is bad it can be found out , if so you will need to estimate . Also the fuel filter must be checked as you changed the fuel , possible dirt accumulating in the tank could have blocked the filter and also the fuel pump and reduced the pressure when required.
Finally remove and clean all the fuel lines to the pump and to the injectors.
I am sure your car will perform as good as new.
Posted on Mar 29, 2011
Does this pressure maintain at that rate over the duration of 30mins minimum?
Also, to insure that it is blocked injectors they need to be removed and tested individually, not until this is done that you can rule out the possibility of blocked injectors.
You need to check the over voltage protection relay Part # 000 540 52 45 if this part number is still in the vehicle replacement is needed as these had a faulty solder join in them, it should be replaced with Part # 000 540 67 45.
Let me know if you need more help.
Posted on Mar 29, 2011
The injector assembly isn't getting the signal to fire each of the injectors. That is either the ignition relay or the ECM having a problem.
Posted on Mar 24, 2011
Your fuel pump is cloged replace fuel pump.
Posted on Mar 18, 2011
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Posted on Jan 02, 2017
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Engine stalls or RPM
fluctuates at idle up and down or dies near idle.
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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