I have a 16v, on which over the last month I have reconditioned the top end.
See http://www.benzworld.org/forums/w201-190e-d-class/1321311-head-coming-off-tuning.html
for all the pics. The compression had been low. I had 4 new valves and reseated all valves.It's all back together now and better than ever. The torque low down is much improved, 3500rpm flat spot gone, and throttle response much better.

However, the throttle response is still rather lazy. It takes between 0.5s - 1 second from hitting WOT to the engine giving full acceleration. It just isn't that response to the pedal. This happens at high and low revs, but worse at low revs. Any idea what can cause this? The mixture is spot-on. I tried unplugging the EHA... it was not very different, perhaps a little bit worse. The other thing I've checked is that the air flow meter plate is sitting in the right position and is not sticking. I don't know what else causes poor throttle response? The performance is fine when it arrives!

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg