Question about 1996 Mercedes-Benz C-Class

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I have a 1996 Mercedes Benz C280 that won't start. If I pour gas into the intake it will start and run until the gas runs out, so I would assume the ignition system is okay. I have 50 psi at the fuel rail (drained tank and replaced with fresh fuel), and it increases to 56 while cranking. I have a positive and negative signal at the injector using a 12V probe tester. So I figured it had to be plugged injectors. So I bought a used fuel rail on eBay and swapped it out, but no change, still won't start. Any ideas? Thanks for reading and have a nice day :O)

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  • Peter Glass Mar 23, 2011

    the fuel pressure is good - why replace the fuel pump - thanks

  • Peter Glass Mar 29, 2011

    I have a positive signal and get ground when engine starts to crank, so injector should open.

  • Peter Glass Mar 29, 2011

    has 50 psi - how can fuel pump be bad

    gets a ground signal when you crank the engine over - how can injector not be opening

  • Peter Glass Mar 29, 2011

    yes it has the new relay - do you know who can test the injectors - I was thinking I was missing something since the replacement used rail I bought on eBay did not change anything

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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

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  • Master
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Hi,

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.

Thanks

Jason

Posted on Mar 29, 2011

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  • Master
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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

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  • Master
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Your fuel pump is cloged replace fuel pump.

Posted on Mar 18, 2011

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