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Old 02-03-2007, 11:15 AM
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Join Date: Nov 2005
Posts: 15
420 Icu

What exactly does the Ignition Control Unit Do? And would this cause missing at first,then not firing at all?

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Old 02-05-2007, 08:21 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The ignition control unit controls ALL phases of SPARK control.

Processes the signal from crank sensor from an A/C wave into a square wave for the fuel pump & tachometer to operate.

Uses the signal from crank sensor to "turn the coil on/off".

Constantly adjusts the ignition timing for most power w/o detonation.

Failure of that part is VERY rare.. a "bone yard" replacement is the best way to find out if it is causing the problem.. Crank sensor failure is MUCH more likely.
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Old 02-05-2007, 07:13 PM
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Join Date: Oct 2006
Posts: 16
200k service for 420SEL

Question for MB DOC: What does the 200k service include?
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Old 02-05-2007, 10:34 PM
just-n-time's Avatar
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Join Date: Feb 2006
Location: Louisiana266 Maloy Rd winnfield71483
Posts: 804
Rpm Sensor

Originally Posted by KgKiely View Post
What exactly does the Ignition Control Unit Do? And would this cause missing at first,then not firing at all?
Look up this on the search you will find repairs and problems associated with that item.I had to remove mine from a 420 sel for intermittent start and stalling.
The 420 I have been working on for 10 months now is in the last stage of repair and I have a great deal of info on problems and ending results, look up just-n-time post's Good luck and I will be glad to help if I can.JNT
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Old 02-06-2007, 09:39 AM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
i completely agree with m.b. doc most likely cause of no spark is the pick up at the flywheel with single wire to ignition module on inner left fender.

David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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