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w124 running terrible

Discussion in 'Engine' started by christokane, Dec 27, 2012.

  1. christokane

    christokane Member

    Messages:
    57
    Joined:
    Aug 15, 2012
    Location:
    Dublin
    Car:
    w124 220ce + w140 S500
    Hey folks..
    My 124 220 ce is running terrible after I had a heavy foot the other the other day , straight after I pulled into a garage and it stalled on me and it would not idle and could only take off with a bit of heel and toe action... so after driving it a bit it got a bit better and it will now idle no problem but it's very jerky at constant power.. not so bad when I put the foot down but a lot of flat spots and just running bad.
    I just replaced the MAF but it made no difference.. I also recently replaced the throttle body as the revs were hunting a bit. It doesn't seem to be back firing so any ideas??
    Thanks in advance

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  2. Dieselman

    Dieselman Banned

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    Car:
    Peugeot 403 Convertible
    Either a spark issue on one cylinder or an air leak into the intake manifold.
     
  3. OP
    OP
    christokane

    christokane Member

    Messages:
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    Location:
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    Car:
    w124 220ce + w140 S500
    Thanks for the reply.. but would it not back fire if a spark plug issue?

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  4. WG M-B

    WG M-B Auhorised Forum Sponsor Authorised Forum Sponsor

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    The best thing for you to do is get it on star/car soft, or a decent diag machine. There is no point throwing money at it without having any idea.
    These cars suffer with wiring loom issues
     
  5. shanksy

    shanksy Hardcore MB Enthusiast

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    Location:
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    Car:
    W124 e220 coupe + W208 CLK430
    I thought only the 320s suffered with the loom ?
     
  6. grober

    grober Hardcore MB Enthusiast

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    Location:
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    Car:
    W204 C200CDI Estate
    Its really a "pre star car " no digital readouts just flash codes. Sounds very like one of the ignition coils /coil leads/ coil extenders has gone-- coil failure quite a common fault. Don't run the car like this as it can take out the ignition transistors in the engine ECU and that's a lot more expensive. There were changes to coil configuration so check with your chassis nos. You probably have the coils mounted under the inlet manifold- with 2 leads per coil
     
    Last edited: Dec 27, 2012
  7. bolide

    bolide Hardcore MB Enthusiast

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    They all do. Even the loom on the diesels degrades

    Nick Froome
     
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    christokane

    christokane Member

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    Location:
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    Car:
    w124 220ce + w140 S500
    It seemed to be sudden after a speed burst so I'll try the coil tmrw , found one for 30 quid and it's refundable ..I'll keep you posted :) cheers

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    christokane

    christokane Member

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    w124 220ce + w140 S500
    OK so I have plug leads and not coil packs.. I got a spare one and unplugged each one to see if anything changed while it was running , it obviously ran a lot worse with each one not connected.. which would assume the leads are OK no??? Vacuum hoses SEEM OK. any thoughts on this? Thanks

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  10. grober

    grober Hardcore MB Enthusiast

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    One coil fires plugs 1 and 4 the other fires 2 and 3---- . If you have access to an old "inductive pickup clamp" fired timing light then try the clamp on each lead in turn to see if it triggers the Xenon light [ normally would be on cylinder 1 for timing but in this case just to detect HT]
     
  11. teddycatkin

    teddycatkin Member

    Messages:
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    Dec 29, 2012
    Location:
    Cheese country
    Car:
    w124 220te W123 230e W201 190e x 2 W107 500sl Astra 1.4 automatic
    Fuel relay (behind battery*
     
  12. OP
    OP
    christokane

    christokane Member

    Messages:
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    Car:
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    No I have 4 individual leads and no combination packs.. 4 cylinder ce220

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  13. Dieselman

    Dieselman Banned

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    Are you sure the replacement MAS is definitely good?
     
  14. grober

    grober Hardcore MB Enthusiast

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    Not sure what you mean ?? each coil has 2 output leads which fire 2 plugs simultaneously- each lead comes from a different end of the secondary induction coil of the coil unit e.g 1+4 together and 2+3 together[ only one cylinder is starting on a power stroke the other is on induction- but the plug still fires]
     
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    christokane

    christokane Member

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    No mine is 4 plugs ,4 leads like most other engines... did it change at some stage over the years? Mine is 93

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  16. OP
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    christokane

    christokane Member

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    @ dieselman .. well I changed it and drove it and it was EXACTLY the same...so put mine back in as to get my money back.. not 100% sure I suppose

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  17. Dieselman

    Dieselman Banned

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    Was it a genuine Bosch MAS or a cheap copy part from a well known supplier.

    If the latter it will have been faulty, almost guaranteed. I've known them be even worse then the faulty Bosch one taken out.


    To test the MAS, meter Pin-5 WRT Gnd. Expect ~2vDc at idle rising to ~4.8vDc at full revs.
     
  18. OP
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    christokane

    christokane Member

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    Second hand Bosch part from a decent over the counter breakers..

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  19. OP
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    christokane

    christokane Member

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    It does have a fuel starved feeling to it in fairness..

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  20. M104 MB

    M104 MB New Member

    Messages:
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    Dec 29, 2012
    Car:
    E320 W124
    [FONT=&quot]If your problem is a fuel starved problem the car would run worse with full throttle but If I understand you correctly the car idle is good and the acceleration is also good but the problem is when you hold the same speed on the highway. I guess your engine is a M111.960 and you have change the throttle body so If I am correct the throttle position sensor is built in the throttle housing so we can rule out this part too.


    I guess you have two coils sitting on top of sparks plug they have a rubber boot that gets dry and tend to crack try to change them not expensive and a good maintenance you need to do anyway. This engine also got problem with the engine wire harness try to move the wires (could possible damage the ECU) and see if you can get some sort of problem or check the wire buy cutting the isolation.




    And you need to be sure your replacement MAS air flow sensor is a good one.

    Could also be a fuel pump problem but If that's the problem you soon will notice when the car stops running.
    Could it be a cam sensor problem I am not sure but look in to it.
    Strange problem if you go uphill is the engine running worse?
    If I would take a guess I would say engine wiring harness.
    [/FONT]
     

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