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