Question about Mercedes-Benz SL-Class

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I have a 1985 mercedes 380sl. (100,000 miles) I just replaced the fuel filter and now it ehausts heavy white smoke. it does not smell like antifreeze! it was immediate..the old and new filters are OEM mercedes parts, however the new one seemed to install opposite of the old one ( no arrow to show the flow on the new one) note: the hose fitting seemed to be installed on the opposite end compared to the old one, but again, no arrow to indicate the flow...any help on this one?? thanks

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  • gary marozas Mar 22, 2011

    thanks very much! I replaced the plugs and it seemed to stop.

  • gary marozas Mar 22, 2011

    thankyou

  • gary marozas Mar 22, 2011

    ok! I'm gonig to give it the "smell" test..! Also, can A fouled spark plug send an "unburned fuel" smell out of the tailpipe?..thanks

  • gary marozas Mar 23, 2011

    thankyou!!!!

  • gary marozas Mar 23, 2011

    ok..I found the plug that was fouled, removed it and rplaced it with a new one. Took it out again and found it to be gas soaked. How do I check that injector to determine if that is the cause?

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Due to the design of the fuel the filter can't be installed backwards, this is true of all MB fuel filters. Ok that said. a fuel filter will never cause white smoke, that has to be from oil or coolant entering the engines combustion chambers, if it is coolant it will have a kind of nauseating sweet smell, if it doesn't have the smell I just described then it is oil, also coolant is 90% steam, oil is truly smoke, so one will dissipate quickly the other hangs around.

Posted on Mar 22, 2011

  • yadayada
    yadayada Mar 22, 2011

    Keep in mind spark plugs just don't foul out, there is a reason, that can be coolant or oil or excess fuel entering the engine.

  • yadayada
    yadayada Mar 23, 2011

    Hello again

    Injectors are tested by doing a flow test, this test requires a special machine that connects to the injectors and opens them for a precise period of time and measures the flow, since for cost reasons this is beyond the means of most owners if not all ( Machine cost about $3000.00) you have two choices, have dealer run the test or just replace the fuel injector and hope for the best.

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Check your oil level. Usually heavy white smoke after warm up is oil getting into the exhaust and vaporizing. ----------- But if oil level is full and oil is not leaking or not getting mixed up with antifreeze then in that case other possibility for white smoke from exhaust is cracked fuel injector or blocked fuel injector. Check all the fuel injector,if any of the injector has fouled plug then that is the cause and fuel injector has to be replaced. Also check the spark plugs and cylinders.If its wet or not firing well then that is the cause.Inspect the spark plug and cylinders very closely.Bleed the fuel lines and then reconnect the fuel line then measure the fuel pressure.If its low then there is problem with injectors getting clogged or spark plugs are not firing as it should.As you mentioned fuel filter is replaced, so it can be issue with fuel pump.----------- May be the fuel filter and hose installation is causing the issue.But yes the new filter fittings is bit different on some models.But still retry fitting the filter and hose in reverse and see if its getting fitted in that reverse way,like the original filter was fitted before.But if its not fitting in that way then its not filter issue but, clogged fuel line, work out Sparks plugs, cracked injectors or oil mixing with antifreeze causing this.------------- Check out this possibilities,this should help.Thanks.Helpmech.

Posted on Mar 18, 2011

  • raj somaiya Mar 22, 2011

    Yes very much possible A fouled spark plug can send an "unburned fuel" smell out of the tailpipe.-----------thanks.Helpmech.

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