Arching on distributor cap cause idle drop? - Mercedes-Benz Forum

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post #1 of 22 (permalink) Old 03-24-2012, 07:27 PM Thread Starter
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Arching on distributor cap cause idle drop?

I am troubleshooting a miss, or dropped idle, when my car is in "drive" and stopped at a light for example. My car has Pertronix fitted and I noticed there is evidence of corroded terminals under the distributor cap. What would cause the arching, and could this be the cause of the stalling out?

If I may, the engine tends to drop rhythmically, such as...

vrrrrrrrrrrrr_drop_vrrrrrrrrrrrr_drop_vrrrrrrrrrrr r_drop_vrrrrrrrrrrrr

...so I don't think it is fuel related. The drop becomes more frequent until it dies.

I can throttle up enough to keep it from dying on me but this almost overrides the brakes. Any suggestions?

-Marrs

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Last edited by DirectLA; 03-24-2012 at 07:29 PM.
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post #2 of 22 (permalink) Old 03-24-2012, 07:50 PM
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Suggestion

Check the coil and the ballast resistor
Also make sure the coil and spark ignition wires are in good condition
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post #3 of 22 (permalink) Old 03-24-2012, 10:47 PM Thread Starter
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Where's the best place to buy ignition items for this car? Online or can they be sourced at local parts stores? I mean Bosch parts specifically, I have seen non-OEM parts at local shops but presume these aren't worthwhile?

-Marrs

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post #4 of 22 (permalink) Old 03-25-2012, 07:43 AM
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MBZ Internet sits

Vintage Part Source Parts and Se

Check out these web site for a multiple of choices to purchase MBZ parts.
Do your home work with original MBZ manuals so you know exactly what part you need.

By the way, I had a similar issue with my 280.
I did the coil, ballast resistor, new cap, rotor, points, condenser, and ignition wires.
Greatly improved, but still had a little droop during idle.
I pulled a few plugs and they all appeared ok.
Frustrated, I went ahead and changed all of the plugs.
Sure enough the idle droop went away. Must have been a fouled plug?
But appearance of the plugs would never show it?
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post #5 of 22 (permalink) Old 03-25-2012, 01:53 PM Thread Starter
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I replaced cap, rotor & plugs, no change. I have Bosch coil # 0 221 119 030 and Bosch ballast resistor # 0 227 901 014 as suggested to me coming in the morning and will report my results.

-Marrs

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Last edited by DirectLA; 03-27-2012 at 09:00 AM.
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post #6 of 22 (permalink) Old 03-29-2012, 03:33 PM Thread Starter
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Resolution: After installing the new Bosch coil and ballast resistor, the car has not exhibited any of the previous problems, it would seem it was indeed the coil.

-Marrs

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post #7 of 22 (permalink) Old 03-29-2012, 05:34 PM
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Good Job

Isn't nice to solve an issue on a MBZ and make her run like new!
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post #8 of 22 (permalink) Old 03-30-2012, 01:36 PM Thread Starter
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Quote:
Originally Posted by Matvh View Post
Isn't nice to solve an issue on a MBZ and make her run like new!
Indeed, these days I can think of nothing more enjoyable. I remember when I chased women, now they chase me in this car but I've already got a mistress with a smooth running inline-six, and oddly she's still a hell of a lot cheaper to maintain!

-Marrs

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post #9 of 22 (permalink) Old 04-08-2012, 04:58 PM Thread Starter
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Updating this thread, today I had the same idle drop but it has not happened since I did the coil swap over a week ago and before I did the swap it was missing constantly so I assumed that fixed it. I'm wondering if either (A) the Pertronix system in my car, or something else, is possibly causing coil failures, or (B) if it could be a simple matter of injectors need cleaned?

Further symptoms, it bogs down when I give it more than about 3/4 throttle such as going up an incline or merging with traffic. It died twice while moving at neighborhood speeds.

I also noted the oil on injector pump was very high, read on another forum from a helpful member who suggested this makes the car sluggish. I am correcting the level to see if it makes any change. What do you guys use for the pump, same as engine oil?

-Marrs

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"Too many people are working at jobs they hate, to buy things they don't particularly want, to impress people they don't even care about." --Dr. Deepak Chopra

Last edited by DirectLA; 04-08-2012 at 06:12 PM.
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post #10 of 22 (permalink) Old 04-09-2012, 07:57 AM
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I would now check fuel pressure and volume, do a filter while there, check for old hoses, pinched lines too.

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