missfiring at tickover 2003 c class 200 petrol

Discussion in 'Engine' started by John Gardener, Jan 6, 2009.

  1. Dieselman

    Dieselman Banned

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    Why didn't he just swap it with the other coil pack to save you a return visit for diagnosis.
    If the coil was faulty the fault would go with it, if not.....
     
  2. rpe2

    rpe2 Hardcore MB Enthusiast

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    Good news, hope it cures it for your sake! And I bet you'll now stick with your new found indie friend!?

    Richard
     
  3. Dieselman

    Dieselman Banned

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    The valve guides being loose is a known issue and the fault could be caused by that, especially if the low compression is correct, but what happens when you re start the engine and let it idle, does it stay smooth until it's driven then go back to misfiring when pulling up or does it go back to misfiring after a short while.

    If the latter suspect the valve guides, if the former I think it might be the EGR or purge valve sticking open causing an air leak at idle.

    It could be the coil but that's not how they normally fail.

    A check with a vacuum gauge would probably reveal the problem.
     
  4. OP
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    John Gardener

    John Gardener New Member

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    missfiring on tickover sad news!

    Sadly after yet 2 more FREE indi M/B specialists full tests, it is not the coil pack/s, BUT number 1 cylinder has loss of compression at tickover due to STILL a build up of carbon gum on the seats on that cylinder, so the EMU unit shuts off some of the fuel to all cylinders to save damage, restarting again resets the EMU, the head must now come off! so I AM NOW WAITING FOR SOME COSTINGS! I have found a specialist who can fit a rebuilt head, saving a lot of labour costs at £60 an hour, thats (not bad!) so watch this space Thanks John,

    PS I blame myself partly for this gum, I drive carefully noe as i am 65 years of age now! not enough long hard runs to clear the system SO BE WARNED! thrash the beasts now and again!!
     
  5. Autofix

    Autofix New Member

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    Has anyone tried a good top end clean. There systems which inject chemical into the intake as the cars is running which do a good job (some better than others). Worth a try before spending on a top end build.
     
  6. OP
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    John Gardener

    John Gardener New Member

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    Misfiring at tickover STILL RE petrol system cleaner,

    Today i put in the fuel tank a whole container of "Red Ex" petrol system cleaner with only one gallon of fuel in the tank, I then gave it a good thrashing, I will not say how fast, in case of whos reading this, but it was frightening! (I am 65 now) I did a tank full of petrol, result, EXACTLY the same! pull up at the lights/traffic, after 15 seconds the car looses power, and the fuel system shuts of fuel to all cylinders, because of lack of compression on number 1 cylinder! nothing to do with coil packs, air valves, worn valve guides! its a now known common fault, that the W203 multi valve engines gum up around the valve seats, so the valves do not close tightly on tickover, at speed the camshaft has enough "boot" to shut the valves, so no misfiring. I have got to admit that 6 seperate garages, 3 main agent M/B and 3 indi M/B specilalists all say, sadly same thing, the heads got to come off! MORE INFO/NEWS LATER watch this space? John :confused:
     
  7. Autofix

    Autofix New Member

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    Hi John,
    The system I mentioned would be more efficient that the redex to the extent that there would be no comparison.
    I have used this and had some success. Thats not to say it will work for you but there is a good possibility and so I think it would be worth a shot.

    Take a look here - http://www.bgprod.ie/fuelair.html Thats the one I use.
     
  8. OP
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    John Gardener

    John Gardener New Member

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    Misfiring at tickover, fuel additiveS ?

     
  9. OP
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    John Gardener

    John Gardener New Member

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    misfiring at tickover UPDATE

    This is strange, I have a gut feeling M/B agents are fully aware of this problem, BUT totally deny any knowledge of it, READ ON<<

    I phoned a main agents workshop reception yesterday to satisfy my mind about this problem, I told them the full story, reply "we have never heard or know about this problem, book it in for a diagnostic EMU inspection, and we will tell you whats wrong, £90 plus VAT" ,
    now fed up knowing what the problem really is, I asked to be transfered to sales, "get rid of the dam car" my wife said, so I asked the salesman about p/exing my car, and upgrading to the latest C Class estate, He asked about service history, any problems with the car etc, I briefly told him that the EMU light comes on now and again, with a rough tickover, but it drives perfectly, he said he would get a price for my p/ex and phone me back, half an hour later, " I have spoken to the workshop tec guys, this model year has a valve gumming up problem, the last car like yours I took in part exchange the owner said "it drives well" needed a new cylinder head, it cost us £2000! so we need to to a few tests first, We will do a free EMU diagnostic inspection and let you know the result,
    so its going in on Tuesday for another FREE diagnostic test, keep looking on this page guys! John :confused:
     
  10. Dieselman

    Dieselman Banned

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    Could be fun. Nice way to get a result for free..:D
     
  11. OP
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    John Gardener

    John Gardener New Member

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    Misfiring at tickover, sad news!


    Hi all, sadly confirmed today, its the valves in number one cylinder are gummed up, I have tried the correct fuel system de gum treatment today, by direct into the inlet manifold and a tin full in the tank, still the same after a good thrashing down the M25! so the heads got to come off! I am receiving quotes, (non M/B dealerships) for a strip and rebuild at £1400, or a new head inc labour £1800 both plus vat, (£3000 from M/Benz dealerships) and the worse thing is when I asked the salesman in the car sales about a p/ex for a newer car, he said "you will have to get the problem sorted before we take the car in p.ex, and its worth then £4000" so in fact my 2003 C class estate Komp with 37000 2 owner car is only worth, without the work done about £2500!! so I will get the work done at an indi M/B specialists and keep the car for a few years now! I will let you all know my progress thanks John,
    PS that makes a year 2000, C class car worth, even in good condition about £ 2000!! in p, ex, from M/Benz dealers! :mad:
     
  12. OP
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    John Gardener

    John Gardener New Member

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    result of misfiring at tickover

    Ok guys, as I said the heads got to come off, I have found out why the valves gum up, its as a guy stated a few threads ago, its the VALVE GUIDES THAT WEAR! and ALWAYS ON NUMBER ONE CYLINDER! oil then runs done the guide and sets as a solid gooie mess on the valve face and seat, SO I have found a (hopefully) superb indi M/B specialist in Chelmford, who after a bit of bartering, is going to fit a brand new head with all ther fittings, cams, valves springs etc including labour and VAT £1800, that includes a free hire car for the 4 days they will have the car, 12 months 12 thousand miles guarantee as well, so I will let you know my thoughts when I get the car back, its going in next Wednesday morning. KEEP LOOKING GUYS! :bannana:
     
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    John Gardener

    John Gardener New Member

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    Hi Diesel man, well you in the end were the closest to my problem, A company called "Gosnays Engineering" of Romford Essex, confirmed that "the valve guides wear, and this allows oil to run down the stems, (always on number one cylinder first) it then bakes hard around the seat, thus at tickover, the camshats on the inlet sides do not have enough "push" due to low profiling, to close them tightly! so its a new head thats being fitted, look at my last tread to see the story, Thanks John [​IMG]
     
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    John Gardener

    John Gardener New Member

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    the cars still in the garage having a new head fitted, more , news when I collect it!
     
  15. OP
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    John Gardener

    John Gardener New Member

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    My misfiring C200k engine result???

    Well guys, yep, it was gummed up valves on no, 1 cylinder, so I have got my car back from The Chelmsford Carriage Company, after fitting a brand new cylinder head, all new gaskets, oil, filter. a,freeze etc, a free loan car for 2 weeks, its perfect! no more misfiring in traffic, total cost inc VAT £1800, well worth it and £1400 cheaper than main agents, sad it needed it at 37000 carefully driven miles fron new! Regards and I hope this helps others,


    John Gardener :bannana:
     
  16. khushdy

    khushdy New Member

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    Hi all

    I have exactly the same issue and cylinder 1 is low on compression and a restart of the engine resets clears the problem only temporarily.

    I am looking for someone reputable who has repaired this exact problem in this thread and knows what they are doing.

    Was this place in Chelmsford any good ?

    Is anyone abe to recommend anyone they have used and has dealt with this issue before so can get some quotes?

    Recommendations will be appreciated. Please advise.
     

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