Well, I replaced the ECU and I'm still having problems. Checked the duty cycle at X11 with my meter and I'm getting 70% at KOEO, but none of the static tests follow specs from the online sources. After engine is warm, regeneration valve capped off, I'm getting a 20% NON-FLUCTUATING duty cycle.

From what I know, this is possibly O2 sensor related, but I have replaced it within the past several years.

Any thoughts? Why no duty cycle?
ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE