c230k missfire on #3 then nothing firing

Jon Bernard

Senior Member
Mar 9, 2007
Reaction score
Hello all,

My 1999 W202 C230K developed a missfire last week, I had to use it for a few days to get to work. At the weekend I removed the spark plugs and found number three cylinder plug fouled. (I didn’t on this occasion remove the battery earth lead :Oops:) after reconnecting everything I tried to start the engine to no avail, when the engine stops turning over I can hear a fairly high pitched electrical processor type sound :shock: appearing to come from underneath were the injectors are, if I disconnect the earth lead then reconnect and try and start the engine again the electrical noise isn’t there until after the engines has turn over. I can smell fuel at the exhaust, any ideas of what my problems maybe?
P.S. the connectors with two coming out of on the coils are in fairly poor condition, the plastic has bits broken off, but the two pins still seem to be connected into the coil.
Thank you


ACMS Mercedes Ltd is an independent Mercedes-Benz service specialist based in Walsall. The company provides high levels of customer service and quality workmanship, at competitive prices. Call Mark on 01922 634666 or 07530 456000
Top Bottom