Thread: '91 300CE (M104) won't start - disconnect EHA & it starts! Why??
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  #18  
Old 04-19-2011, 06:06 AM
Ferdman Ferdman is offline
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Join Date: Aug 2002
Location: Southeastern PA
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Ryan, the ECU (or EZL) is mounted on the left (driver's side) inner fender. A new one costs around $2,500 so be sure to maintain your ignition system (spark plugs, distributor cap, distributor rotor & ignition wires) to prevent failure of the ECU. I went through that experience with our daughter's 1991 300CE.
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Fred Hoelzle
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