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#1
06-17-2009, 04:10 PM
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90' 300CE rough idle/missfire
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) 
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#2
06-17-2009, 09:20 PM
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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
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#3
06-17-2009, 10:56 PM
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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)
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#6
06-18-2009, 12:59 PM
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Quote:
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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".
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#7
06-19-2009, 10:34 AM
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Yes start with a new fresh set of wires.
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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
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#8
06-20-2009, 01:42 AM
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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)
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#9
07-08-2009, 01:26 PM
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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
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Dmitry 90' 300CE 17" Intra Signums Brulen mufler Euro Headlights/Clear Blinkers White gouges (made my own)
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#10
07-08-2009, 02:23 PM
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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.
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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
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#11
07-08-2009, 10:15 PM
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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.
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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
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#12
07-08-2009, 10:54 PM
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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.
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#13
07-10-2009, 01:25 AM
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Engine is 104. Really wanted to avoid replacing parts one by one to get to the problem. Wires cost me $160, coil will be another $60.
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Dmitry 90' 300CE 17" Intra Signums Brulen mufler Euro Headlights/Clear Blinkers White gouges (made my own)
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#14
07-10-2009, 08:55 AM
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M104? This is a replacement motor? Understand your need to keep from needlessly installing parts, but everything in the ignition system is a maintenance item that you have to expect to replace on some sort of schedule. You don't tell us anything about its maintenance history, so we have to assume that it's just the coil's time to be replaced. Naturally, that's your decision to make, but you shouldn't be puzzled why the motor isn't running smoothly when you can see for yourself that you have arcing ignition components.
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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
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#15
07-10-2009, 09:06 AM
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<<
M104? This is a replacement motor? >> 104.980 ..............Coupe.
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A Dalton
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