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Old 06-21-2004, 03:19 PM
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Join Date: Apr 2002
Location: westchester, ny
Posts: 747
replaced w124 ecu brain; now what?

Hi. Well, this weekend I celebrated father's day by replacing the ecu on my 87 300e with one I got for a reasonable price on ebay. And afterward, instead of the fixed 90% reading I had gotten previously, I actually got a fluctuating duty cycle reading, in the 20% range, which I will try to reset to about 50% (I had also replaced the oxygen sensor & OVP over the last few weeks, but that didn't change anything.). My question is this: At lunch today I was browsing through the Mercedes Bible, & it said that (a) the car should sit for 90 seconds key on engine off to allow the ecu to set up and (b) certain codes had to be set. I never did either one of those. Is there anything I need to do for the "new" ecu to achieve proper operation?
I also want to thank everyone on this board for their support, learning and encouragement which enabled me to attempt all the work I have learned to do on my vehicles.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)
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Old 06-21-2004, 08:11 PM
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Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
On that car it is just plug and play.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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