I have also found that on the '90 the light will stay on when there are codes stored in the EDS. I've heard that the computer in later models is slightly different, so YMMV.

Now that you know your emissions systems are functioning, it's time to look into compression and the IP. Hope it's the IP because it's cheaper than an engine

__________________
Dale

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1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz

Pre-glow - A moment of silence in honor of Rudolph Diesel