W124 220 injection question

Discussion in 'Engine' started by mario andretti, May 28, 2015.

  1. mario andretti

    mario andretti Hardcore MB Enthusiast

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    I have a strange one here as I did the head on my 220. I disconnected the crank sensor and pulled the plugs so as to spin it over and bleed the tappets. But what I noticed was number one injector only was letting off a short spray of fuel as I would start to crank the engine.
    Now I am wondering is this a cold start setup and is it normal operation.
     
  2. carat 3.6

    carat 3.6 Hardcore MB Enthusiast

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    No, not a cold start function. Disconnect the electrical plug and see if it still pass'es fuel.
     
  3. OP
    OP
    mario andretti

    mario andretti Hardcore MB Enthusiast

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    Yeah it only happens when connected up so was leading me to think it was a start assist of some form.
     
  4. carat 3.6

    carat 3.6 Hardcore MB Enthusiast

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    More likely the loom is in need of repair.
     
  5. OP
    OP
    mario andretti

    mario andretti Hardcore MB Enthusiast

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    Brand new loom fitted too
     
  6. carat 3.6

    carat 3.6 Hardcore MB Enthusiast

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    That's weird. I've not come across another that does that.

    What if you unplug the cam sensor?
     
  7. OP
    OP
    mario andretti

    mario andretti Hardcore MB Enthusiast

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    Had the cam unplugged as going to go back at her this evening. The only thing I am thinking of is that the battery was running down and if she was pulling a feed back through the injector....
     
  8. OP
    OP
    mario andretti

    mario andretti Hardcore MB Enthusiast

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    The reason I think it could be battery is that she really started to let fuel out as the battery got very low. I was only wondering if it was a cold start or priming thing as I know some Bosch system s fire all injectors together on the first sequence and then go sequential.
     
  9. OP
    OP
    mario andretti

    mario andretti Hardcore MB Enthusiast

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    Well had a look at it and it looks like the engine ECU is after failing on it. Now just to find the reason for this.
     
  10. aghajaved

    aghajaved New Member

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    off the topic but i need a little help. i have e220 with m111.960. the compression pressure range according to mercedes is 7.5 to 10 for fuel optimised m111.960 and 10.5 to 14 for m111.960. now i am a little confused which one applies as i could not find any information regarding fuel optimised m111.960 engine. my compression test results show 8.5 bars in all four cylinders
     

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