I guess this is another one for Arthur.
Car starts but idles rough and misfires. As soon as I put it in gear it gets rougher and/or dies (turning a steering wheel while in Park or Neutral causes same effect). A new blower motor worked intermittently when problem begun but now not working at all. While engine was running, lifted the hood up, noticed that several continues sparks are going from ignition coil wire to surrounding engine parts.
"Recently" (2 years ago) changed voltage regulator after old one completely warned out. Car is not used much. Basically start it to repark once or twice a week for street cleaning.

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Dmitry
90' 300CE
17" Intra Signums
Brulen mufler
Euro Headlights/Clear Blinkers
White gouges (made my own)

Are the plugs arching?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

Ps2cho, do you mean if i have a spark on them or if there is arcking arround them?

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Dmitry
90' 300CE
17" Intra Signums
Brulen mufler
Euro Headlights/Clear Blinkers
White gouges (made my own)

yeah, that sounds like a problem right there.... that could explain all of it...

What does it all mean than ? Ignition coil is gone?

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Dmitry
90' 300CE
17" Intra Signums
Brulen mufler
Euro Headlights/Clear Blinkers
White gouges (made my own)

Ignition coil wires shouldn't arc to the surrounding engine parts. That is definitely not the normal behavior of a coil or spark plug wire.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

Paul, I understand that it is not normal, but what is faulty here?
what needs to be replaced?
I did the search prior to posting on similar symptoms but came up with an array of possibilities (OVP, harness, mass sensor, O2, etc.). Unfortunately
I am very short on time and money right now to start replacing those one by one. So need to narrow it down as much as possible.
Could an arcing wire mean bad insulation?
Brgds.
Dmitry

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Dmitry
90' 300CE
17" Intra Signums
Brulen mufler
Euro Headlights/Clear Blinkers
White gouges (made my own)

I think it means you have a bad coil wire.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

Yes. As Paul S advises, you should replace the wire that's arcing. The arcing means that the spark that the ignition system is looking for from the coil in order to conduct combustion, is partially lost by grounding into the engine block. Hence, incomplete ignition and the misfiring you're experiencing. There may also be other things going on that contribute to your problem, but you can't begin to deal with those until the basics are taken care of.

__________________
1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't

Yes start with a new fresh set of wires.

__________________
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

Ok, seems that I need the more expencive ones (For models still utilizing distributor cap) by Beru. Well... lets see if it works.
Thanks guys

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Dmitry
90' 300CE
17" Intra Signums
Brulen mufler
Euro Headlights/Clear Blinkers
White gouges (made my own)

Wires are in but no change
What is the next step guys? Started the car with fresh wires still
feel slight misfire but not too bad. Put the car in gear without releasing the break pedal and engine started working rough, almost stalling. So this is same as before symptoms. I can see some very tine arcing in three locations on the ignition coil.
Dmitry

__________________
Dmitry
90' 300CE
17" Intra Signums
Brulen mufler
Euro Headlights/Clear Blinkers
White gouges (made my own)

Dmitry, what we've been trying to tell you is that electrical arcing in the ignition system points to bad components. Whatever you can see that creates arcing sparks needs to be replaced. At first, it apparently was the coil wire and/or plug wires, and you took care of those. Right? Now it sounds as though the coil itself is suspect. As stated earlier, there may be other things going wrong that affect your idle condition too, but you can't really deal with those until the basic ignition system is in order.

__________________
1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't

If you are having trouble seeing the arching, or determining where it is arching, spray some water (mist, not a shot) at night with the engine running and you should be able to see.

Now that the wires are good, its gotta be the coil, especially if that's where it is arching.

__________________
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

I assume that this engine is a M103 here.

I haven't seen a post by the OP that actually says that there is arching on the leads.

Misfires are 90+ plus electrical. The cheapest tune up and trouble reducing on these cars is replacing leads, plugs, distributor cap and rotor.

Do those first. You wont lose on this. Since you have already new Beru leads do the rest.