Question about Mercedes-Benz 500-Class

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After caris not used for several days it starts promptly, however after running for more than 15 minutes it does not start. battery is stron, fuel level ok, if i spray a "quick start" aersol into the air cleaner it usually then will start. any ideas??

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  • charles schweizer Dec 30, 2010

    just returned from my local mechanic. although he can not confirm it believes too much fuel is getting into the engine making it a rich fuel. to further confuse the issue he does not get a spark on one side the cyllinders wwhen he runs a check. i guess the best bet is an mb mechanic.

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  • Mercedes-Benz Master
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The fuel level is ok.But fuel pressure.It can be low.If the fuel pressure is low then it will not start frequently as required.Get the fuel pressure checked.If the pressure is low then this problem is related to faulty fuel pump or fuel filter.
as you spray fuel the fuel directly gets to the fuel rail and car starts,but when the aerosol is not sprayed then the fuel is not passing to the fuel rail and car is not starting.After few tries the fuel gets to fuel rail/fuel line and car starts.So check the fuel pressure,also get the fuel line and fuel rail checked.-----------Also see if spark plugs are wet or moisture collected or spark plugs worn out Then its faulty spark plug causing this problem.------------
This should help.Thanks.Helpmech.

Posted on Dec 30, 2010

  • raj somaiya Dec 30, 2010

    Yes no spark at one cylinder can cause misfire or no start problem if other cylinders are getting weak.But still once getting with your local MB dealer is advisable..as they will test it as per the schematics value.This will confirm the fault.------------- Thanks.Helpmech.

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