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#1
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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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#2
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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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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#3
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200k service for 420SEL
Question for MB DOC: What does the 200k service include?
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#4
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Rpm Sensor
Quote:
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 |
#5
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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.
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David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg |
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