Question about 1997 Mercedes-Benz E-Class

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1997 E-420 the code is PO300 which is random misfireing. before that i retreave code PO307 which is cylender #7 is misfireing. so i replace all the spark plugs and coil pk on cylender #7 and now it shows PO 300 which is random misfireing. before all this the car was running great nothing was wrong on all this ignition stuff. any advice will be very welcome... thanks , Sergio

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  • sabbb007 Feb 12, 2009

    gator24 the E-420 doesn't have a distributor cap or rotors. it has independent spark plug coil and spark plug boot.



    thanks for the info....

  • sabbb007 Feb 12, 2009

    dont worry the good thing is trying right!! and thats what counts...

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Hello, Check/replace distributor caps and rotors. They will cause this problem.
If you find this information to be correct would you please enter a "fixya" rating.
Thanks, Gator241

Posted on Feb 12, 2009

  • Wally Wicker Feb 12, 2009

    Sorry. I was thinking of the later models E400 and E500
    Gator241


  • Wally Wicker Feb 13, 2009

    Hello Again, I don't know why I didn't think of this before. Sometimes this old head doesn't work right.
    1997 model year was one of the years that the wires would disintegrate inside the engine harness. Check the wiring going to the injectors, etc. to see if the wires have come apart. Just take a razor blade and split the harness to inspect the wires. If you find that some wires that are coming apart, you will have to replace an engine harness.
    CYA, Gator241

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