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W211 low fuel pressure under hard acceleration star code 22e7

Discussion in 'Introduce yourself' started by mshah70, Jun 8, 2018.

  1. mshah70

    mshah70 Senior Member

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    Your Mercedes:
    Mercedes w211 2007 E220 Cdi
    Hello
    Owner of merc w211 e220 Cdi 2007
    226k

    I am having low fuel pressure issues.
    Star diagnostic code 22e7
    Check high pressure control ‘rail pressure too low’

    When i open up the throttle (hard acceleration) going up a hill or on motorway, the engine light comes on and car goes into limp mode.

    I used Star to check high pressure control, Quantity control valve, pressure regulator all sensors seem To be in working order.

    I tested the low pressure circuit, fuel pump seems to be in working order.

    Please i need some help.
     
  2. John Laidlaw

    John Laidlaw Senior Member

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    Injectors or injector seals. Any weeping around them?
     
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  3. OP
    mshah70

    mshah70 Senior Member

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    Had injector seals replaced, no weeping at the moment.
     
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  4. OP
    mshah70

    mshah70 Senior Member

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    I can feel the engine judder while accelerating hard from 70mph, thats when engine light comes on driving on the motorway.
    And while driving local it usually comes on while accelerating hard up an incline.
     
  5. John Laidlaw

    John Laidlaw Senior Member

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    What’s the engine sounding like when not under load? Normal?
     
  6. OP
    mshah70

    mshah70 Senior Member

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    While on neutral the engine sounds ok, while on D at a standstill it sounds a little rough.

    I have tried doing zero quantity calibration prior to this problem which does make the idling smooth.
    But after i had this problem even the calibration doesnt seem to make much of a difference.

    And generally the performance is gone low in terms of acceleration.
     
  7. John Laidlaw

    John Laidlaw Senior Member

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    Normally at this point I’d say get it on Star but you’ve already done that!
    Injectors themselves would be normal port of call when you mention what you have for me, hopefully more experienced folks on diesels will chip in shortly
    Otherwise it’s the usual eliminations MAF etc etc etc. Good luck
     
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  8. OP
    mshah70

    mshah70 Senior Member

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    But wouldnt MAF sensors or throttle position/ actuator etc show up as a fault on star diagnostics?

    The high pressure fuel pump seems to be in order according to Star.

    The only thing i havent checked physically is the injectors. Which im not sure how to.

    I have done a compression check on star, also done a smooth engine check, everythimg seems ok. Unless im missing something.
    I would appreciate some expert advice. Thanks
     
  9. John Laidlaw

    John Laidlaw Senior Member

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    That’s what I meant when I said Star- indeed those would show up...
     
  10. bembo449

    bembo449 Senior Member

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    spill test the injectors to see if they are leaking back too much
     
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  11. OP
    mshah70

    mshah70 Senior Member

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    Can u guide me how to do this or where i can get the proper test kit
     
  12. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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  13. bembo449

    bembo449 Senior Member

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    I reckon he will find 3 of the 6 will need a refurb , if not all of them
     
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  14. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    I agree, especially at that mileage.
     
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  15. Westheath

    Westheath Senior Member

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    Your Mercedes:
    Empty garage, awaiting new toy :)
    It only needs 1 to dump fuel under load it cuts out or runs rough :)

    Just had it today on a Sprinter
    customer was advised to replace all injectors (another garage)
    one was on full flow and return over 3500-4000 rpm dumping the rail pressure.

    Might be an idea if you can get them out and send all off for refurbishment.

    Ignore the high rpm on the top right but the values on the left shouldn't be exceeded
    when testing in Star.
    The Y94 valve is a little high on this image but mostly due to high rpms

    IMG_2263.JPG
     
    Last edited: Jun 8, 2018
  16. OP
    mshah70

    mshah70 Senior Member

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    I have ordered the leak testors, i will post my findings in due coarse
     
  17. John Laidlaw

    John Laidlaw Senior Member

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    We got there!
    Personally I’d get them all out to refurb, invariably in my experience 1 then 2 then.... you can see where I’m going I guess :)
     
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  18. OP
    mshah70

    mshah70 Senior Member

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    Is it normal for injectors to leak a little fuel?

    And where is the best place to get injectors refurbed, im from south Wales.
     
    Last edited: Jun 8, 2018
  19. Westheath

    Westheath Senior Member

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    The maximum permissible return quantity is 3x as large as the smallest return quantity measured.

    Target quantity 50ml
    run engine till one container reaches 50ml
    turn off engine read the lowest amount
    then times it by 3 for acceptable maximum return rate.

    1=20ml 2=15ml 3=20ml 4=50ml So 3x15ml=45ml injector 4 @50ml is above max return rate 45ml.

    1=35ml 2=33ml 3=50ml 4=31ml So 3x31ml=93ml injector return quantities are within 93ml

    If test is ok after the above has been performed ...........
    give it a full throttle test and see if any of the bottles suddenly fill up,
    this indicates an injector/s is leaking off and dumping the fuel rail pressure.
     
    Last edited: Jun 8, 2018
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  20. John Laidlaw

    John Laidlaw Senior Member

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    mshah70 likes this.

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