IF every thing checks out!!... Timing . Dwell. Valve adjustment. Compression. Fuel mixture.

Then try disconnecting the electrical plug on the alternator. HAVE seen many of the 4.5's that produce too much A/C current due to diode problems!

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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)
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