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great week and now 0633 & 0629 misfire

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Botus, May 17, 2018.

  1. Botus

    Botus Senior Member

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    So Friday I got food poisoning which is still with me and as I reversed into a parking space at the doctors today, the car starts shuddering and I thought would stall.

    its Ok at 1500 revs but at idle its pretty nasty and I have codes

    0633
    ML ON Misfire cyl 1 damages 3 way cat (P0301)

    0629
    ML ON Misfiring (P0300)

    on the internet can't see these codes mean much, some saying coil pack, but wayne gates just said that's a rare one on the 5.5 v8, others saying injector and WG say that's a possibility. The way it as low revs not keen on a 20 mile trip to take it in and still rather ill so not happing this week.

    Anyone got any ideas please?
     
  2. alexanderfoti

    alexanderfoti Moderator

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    First thing I would do is pull the plug and check for obvious signs of arcing or issues with the connection to the coil pack. Start with the basics.
     
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  3. OP
    Botus

    Botus Senior Member

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    thanks... being a knob which is cyl 1

    left front (as in the one closest to the left headlamp?)
     
  4. alexanderfoti

    alexanderfoti Moderator

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    I struggle with that one too.

    It should be front cylinder, on the offside (drivers side headlight)
     
  5. alexanderfoti

    alexanderfoti Moderator

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    I struggle with that one too.

    It should be front cylinder, on the offside (drivers side headlight)
     
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  6. OP
    Botus

    Botus Senior Member

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    bugg*r

    in that case just took 5 out swapped plug to 7 and coil pack to 2
    strangely I still have a misfire on cyl 1:(
     
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  7. OP
    Botus

    Botus Senior Member

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    so after cleaning and phaffing about coil pack #1 dead (now on cyl 5)

    plugs look OK on all 3 cyl I checked
    as far as I can see on the same 3, top of pistons all the same a bit dirty and blackish
    slapped plug from #1 to #2 and coil pack from #1 to #5

    misfire now on 5, interesting as WG didn't think they play up much.

    in however you are meant to measure ohms.... with meter on "20" checked the 4 pins, could only get continuity on 2 (on either coil pack)
    #1 7.95 (the dead one)
    #5 7.70

    cleared codes fired it up took a smidgen to misfire, seemed less bad, EML came on checked codes fault as above now on #5

    so I need a
    ZS0012
    A000 150 27 80
    Delphi 190005267
    06T249
     
    Last edited: May 17, 2018
  8. LostKiwi

    LostKiwi Senior Member

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    Continuity checks at the connector only look at the primary windings. If the fault is in the secondary windings or is a weak insulator you won't see anything.
     
  9. alexanderfoti

    alexanderfoti Moderator

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  10. OP
    Botus

    Botus Senior Member

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    yes, before I swapped it
    #1 was 7.95 (the dead one)
    #5 was 7.70 (a good one)

    thanks for ebay link u found way more than I did
     
    Last edited: May 17, 2018
  11. alexanderfoti

    alexanderfoti Moderator

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    As per lostkiwi it only gives you part of the picture. If they are generally reliable (as per WG) I would buy a second hand one for £15.
     
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  12. OP
    Botus

    Botus Senior Member

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    as an interesting one.... the coil pack that gave on cyl 1

    0633
    ML ON Misfire cyl 1 damages 3 way cat (P0301)

    0629
    ML ON Misfiring (P0300)

    when at the front on the other bank cyl 5 gave different codes

    0637
    Misfire cyl 5 damages 3 way cat (P0305)

    0629
    Misfiring (P0300)
     
  13. OP
    Botus

    Botus Senior Member

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    as I have a main merc dealer within 1 mile of my home thought I'd go ask.

    Not sold one in last 6 months, none in stock £55 each
    Local parts factor £50, one in stock

    but it won't match, so fleabay second-hand 2 on order for 39 quid from a 2008 car allegedly

    thanks for your help guys :)
     
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  14. alexanderfoti

    alexanderfoti Moderator

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    Looks like the same code to me? Last number of P030X is the cylinder number.
     
  15. OP
    Botus

    Botus Senior Member

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    0633 and 0637

    usually on my scanner these first 4 digits is the fault code
     
  16. alexanderfoti

    alexanderfoti Moderator

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    Ah but the ODB compliant one is the Pxxxx (for powertrain)
     
  17. OP
    Botus

    Botus Senior Member

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    so my 2 second-hand coil packs rocked up. measured the resistance as per the first round and couldn't get anything conclusive

    before

    #1 was 7.95 (the dead one) now its at #5 with reading when completely cold of 8.13
    #5 was 7.70 (a good one, lower than anything else I've measured including the broken one ???)
    #6 measured for first time cold 8.15

    the two new ones I got 8.30 and the other was 8.41.... but my meter was being odd and it took 10 mins before any pack gave me a reading at all !!!! so I came to conclusion the kit/method I'm using isn't helping anything,

    bolted on the two later packs that claim to have come of a C350 to cylinders #5 and #6 kept the orig from 6 in the boot as a spare... fired it up all normal and drives normal, will double check if anything shows up, but I expect not as cleared it all last week and hadn't restarted since
     
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  18. alexanderfoti

    alexanderfoti Moderator

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    Good result. Wish my misfires where as easy!
     
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