I just acquired my 4th Mercedes. It is a '91 420SEL with 130,000 miles. As with the first three, this one came to me in inoperable condition.
What I have discovered is that fuel is reaching the fuel distributor, but not making it to the cylinders. So my question is what controls the fuel distributor? Is it the ECU?

If it is the ECU (or similar) that is suspect, is there a way to test it short of a swap out? (I'm assuming that the ECUs from my '89 300SEL, or either of my 190Es would not fit).

Thanks.
-Brett