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How do I know if I have a DPF?

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Scottie CLK, Jan 2, 2013.

  1. Scottie CLK

    Scottie CLK Active Member

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    Your Mercedes:
    CLK/2005/220CDi
    Hi, I have a December 2005 CLK CDi 220.

    Had it for two months and am very impressed. It went in for a remap a few days ago, and before it had a health check and RR run.

    There is a power dip around 2300 to 2700 rpm and it shows the error code 2632 "chech charging system : charge too high".

    A little research suggests first course of action is to clean out the EGR valve, then process to check cat and DPF.

    I would therefore be veyr grateful if anyone could answer the following :-

    1. Although the EGR can be cleaned, is it better to just blank it off?

    2. Does the car have a DPF, or is it just a standard cat?

    3. I'm told as it's a diesel the car can pass MOT without Cat, so if this is blocked or causing problems can you just use a decat pipe?

    Car runs great apart from this power dip and makes the power and torque it should elsewhere.

    Any other suggestions welcome as I need it to tow my track car :)

    Many thanks,
    Scott.
     
  2. brandwooddixon

    brandwooddixon Senior Member

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    A 2005 car is unlikely to have a dpf. If you're unsure then search on here for a VIN checker link.

    Was the fault code read by STAR or a generic reader - some codes are year and model specific?
     
  3. andy@pcd-ltd

    andy@pcd-ltd Guest

    Has the fault only started to happen since the remap has been carried out
     
  4. OP
    Scottie CLK

    Scottie CLK Active Member

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    CLK/2005/220CDi
    Hi, thanks.

    The fault was present before the remap, it was brought up in the health check and RR graphs showed it, it occurs between 2300 and 2700 when you accelerate fully, it won't show under partial acceleration and runs full boost spot on above 2700 and belwo 2300.

    It is a little worse after the remao as the car runs a little extra boost now so hits the limit and the ECU cuts the boost which causes the dip spike in the graph.

    First reader was a small hand held one, not sure if the second reader he borrowed was a STAR, it logged real time faults, let you clear codes, was about laptop size.
     
  5. _Taz_

    _Taz_ Senior Member

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    Your Mercedes:
    2011 E63 6.3NA AMG Tenorite Estate MCT 7g
    ^^ As andy, charge too high means ( I think ) that the ECU is seeing too high boost & backs off the ECU.

    As for the DPF, my old bus is an "E" on a 320cdi, yup, it has a damned DPF :Oops:

    clean tailpipe = DPF

    Sooty = nope :D


    it may be the mapper has not altered the overboost setting in the ECU, I'm not familiar with the ECU setup, some just use a crude pressure switch / sensor that just gets recalibrated.
     
  6. OP
    Scottie CLK

    Scottie CLK Active Member

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    CLK/2005/220CDi
    hi yes the issue is the ecu is seeing overboost just at abut 2500 revs and backs it off, but then boost is ok before and after that point.

    I'm ruling out injectors, actuator, turbo as otherwise the problem would be at all revs.

    Reading round so far seems to suggest a clogged EGR valve or restricted cat can cause this particular symptom, and possibly a DPF if the car has one.
     
  7. Alex Crow

    Alex Crow Senior Member

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    Your Mercedes:
    W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
    Actually, those will cause lower boost pressures, not higher.

    If you have the original service book with data card, DPF is code 474 - no code = no DPF.
    Also, you will have a sensor mounted immediately to the rear of the air filter housing on this car if DPF is fitted (and should have oil sticker for low ash oil too).
     
  8. OP
    Scottie CLK

    Scottie CLK Active Member

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    Thanks, will take a look. I would have thought blocked cat would cause higher boost pressure as it created greater pressure on the output side and thus slowed air down out of the exhaust side and made it easier for pressure to build on the inlet side.

    Obviously I appreciate your knowledge on this as I only really have experience of rotaries and four pot Jap turbo engines! :)

    What would cause boost dip at 2500. RR graph show straight line for torque from about 1500 to 4000 rpm, with a sudden dip from 2300 down to 2500 back at top at 2700, torque goes from 230 lb/ft to 180 at trough of dip.
     
  9. OP
    Scottie CLK

    Scottie CLK Active Member

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    Is there a guide to how to remove the EGR for cleaning or is it just the two obvious bolts?
    THanks.
     
  10. WG M-B

    WG M-B Senior Member Authorised Forum Supporter

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    It's just the x2 bolts
     
  11. OP
    Scottie CLK

    Scottie CLK Active Member

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    THanks will give it a try, didn't want to come off so wasn't sure if it was more complicated or just needed a bit of force :)
     
  12. OP
    Scottie CLK

    Scottie CLK Active Member

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    The EGR was cleaned yesterday, was apparently filthy and not even operatign properly.

    The good news is the problem is 80% gone now, but am trying ot work out he last 20% :)

    The VIN is WDB2093082F184104

    Can anybody tell me what that means? I assume the lack of 474 means no DPF?

    Thanks,
    Scott.
     
    Last edited: Jan 11, 2013
  13. Alex Crow

    Alex Crow Senior Member

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    Did this ^^ not help?

    Data card in back of service book BTW, and the chassis number does not contain a DPF specific code.
     
  14. OP
    Scottie CLK

    Scottie CLK Active Member

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    HI unfortunately I do not have a service or any book with the car, I jsut got an electronic service print out from Mercedes Stoke / Lex and an MOT history i checked myself from the government website.
     
  15. OP
    Scottie CLK

    Scottie CLK Active Member

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    I can't see any "low ash oil" sticker and there was no obvious sensor immediately after the ari filter housing before the AFM.
     
  16. Alex Crow

    Alex Crow Senior Member

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    Nope, sensor at REAR of air filter housing, not front.
     
    Last edited: Jan 11, 2013
  17. mersum1es

    mersum1es Senior Member

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    Your Mercedes:
    W212/-09/350CDI, W219/-07/320CDI, EX:W220/-01/320CDI, EX:W211/-04/320CDI, EX:W210/-01/270CDI
    Russians give:
    vin WDB2093082F184104
    whc WDB
    chassbm 209308
    chass_ident 2F184104
    type 209
    subbm1 308
    subbm2
    auxiliary_drive
    body
    body_code
    delivery_date 051101
    engine 646966 30 481566
    front_axle1
    front_axle2 AL254050936676
    heater
    interior 711A
    lights
    model_idx 0
    odometer
    order_num1 0553735650
    paint1 040U
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    production_num1 2172353
    production_order_ref N
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    release_date 051101
    retarder 8 051101
    rims
    service_num
    steering
    trailer
    transfer_case
    transmission 716654 02 178384
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    Code Текст
    M22 DISPLACEMENT 2.2 LITER
    NM5 Unknown
    R52 Unknown
    U18 AUTOMATIC CHILD SEAT RECOGNITATION (AKSE)
    249 AUTOMATICALLY DIPPING INSIDE REAR VIEW MIRROR
    411 Unknown
    461 INSTRUMENT WITH MILES IND. AND ENGLISH LEGEND
    477 Unknown
    500 OUTSIDE REAR VIEW MIRROR LH AND RH FOLDING
    523 RADIO AUDIO 20
    551 ANTI-THEFT/ANTI-BREAK-IN WARNING SYSTEM
    573 Unknown
    580 AIR CONDITIONING
    600 HEADLAMPS - CLEANING EQUIPMENT
    613 LAMP UNIT - ASSYMETRICAL, LH TRAFFIC
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    690 Unknown
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    882 INTERIOR SAFEGUARD/TOWING PROTECTION
    926 AIR POLLUTION CONTROL D4 EU4-MEASURES
    954 EQUIPMENT PACKAGE FOR AVANTGARDE VEHICLES
    983 VEH. TITLE OF OWNERSHIP-OMITTED AND W/O COC PAPERS
    989 Unknown
    205B OWNERS MANUAL AND SERVICE RECORD - ENGLISH
    221B INFO PLATE, COOLANT - ENGLISH
    250B Unknown
    283B Unknown
    5XXL EUROPE
    040U BLACK
    711A Unknown
     
  18. OP
    Scottie CLK

    Scottie CLK Active Member

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    Thanks for that, had a look today, the back of the airbox opposite to the bulkhead is just flat and can't see a sensor anywhere.

    Car runs much better after EGR clean so just weighing up whether to remove it all together.

    Will probably get the cat knocked out at next service as well, can only help I'd imagine. This is the first diesel I've had but all previous petrols I have always decated.
     
    Last edited: Jan 14, 2013
  19. rf065

    rf065 Senior Member

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    Not sure if the CLK was ever fitted with a DPF a standard. Certainly in 2005 and as late as 2007 it was an option only, I doubt they would fit one as standard after that as it would then be an outgoing model due for replacement.

    Russ
     
  20. David-Butter

    David-Butter Senior Member

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    Id have the DPF out, No end of issues with them forced regenerations from the dealer cost over 85+VAT i payed just over £300 to have it out and save a lifetime of issues.
     

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