Question about Mercedes-Benz 420-Series
Wrong plugs get Bosch F8DC4's as the others are not hot enough to run in the MB's and they are non-resistor plugs. What you put in are resistor plugs. I would also suggest replacing the coil as it provides the spark. I would replace the fuel filter and check valve to ensure proper pressure to fuel manifold for injectors and dont use additives as they can cause bigger chuncks to clog the injectors all at once.
If you replaced the rotor you should have also replaced the cap. If one is bad so is the other.If the wires are old they are probably way old. Most of your issues sound tune up related for sure.
Injectors could be an issue, You could rebuild them pretty easy. Go to benzworld.org or peachparts.com to look into that.
Lots of what ifs but a real replacement of old parts is the best place to start.
Posted on Jul 20, 2009
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Posted on Jan 02, 2017
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