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W124 E300 cold start issue

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by wilf1227, Dec 8, 2009.

  1. wilf1227

    wilf1227 Member

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    Your Mercedes:
    W124 300E saloon 1992
    I have now got my E300. Having had it checked over there are no issues mechanically. There does seem to be a reluctance to start from cold. It takes longer for the engine to fire depending on the temperature, but only from 1st start. Is there a cold start injector or temp sensor that could cause this. Once started it is fine. The one thing I do know needs changing is the oil filler cap. Could this cause an issue with starting or idle speed when warm if it is allowing air past? I remember that the Audi quattro would not idle if the oil filler cap was not located correctly.

    Any help would be appreciated.
     
  2. turbopete

    turbopete Senior Member

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    Location:
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    Your Mercedes:
    2010 '60' Ford Mondeo 2.0TDCi Zetec (sorry)
    first thing to check here would be the glow plugs. does the warning light come back on once the engine starts?
     
  3. jamesleigh

    jamesleigh Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
    c220cdi clk320 cab vito 115 sprinter 315 cdi b180cdi a150cdi
    you might try 10 amp fuse in the overload proction relay its behind the battery if your car is a petrol engine
     
  4. OP
    wilf1227

    wilf1227 Member

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    Your Mercedes:
    W124 300E saloon 1992
    Sorry should have said it is petrol rather than diesel.
     
  5. OP
    wilf1227

    wilf1227 Member

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    Your Mercedes:
    W124 300E saloon 1992
    I will have a look tomorrow :)
     
  6. meanie

    meanie Senior Member

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    If it is just reluctant to start (not downright difficult), work through the following;

    Dizzy cap & arm
    Temperature sender
    Cold start injector
    All vacuum & breather pipes on the inlet manifold

    The oil filler cap should have no bearing on idle, but there is a breather filter in the top of the rocker cover which can get blocked & have an effect on idle quality.
    as you've just bought the car, have a sniff of the oil to see if it smells of petrol. If so, replace oil 7 filter (you may want to do this anyway).
     

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