Do try pushing on the air meter plate. If the car has sat for a while with no fuel going through it, it could be stuck.

You should notice that when you push on it with proper fuel pressure, it will be much harder to push than when you have no fuel pressure.

With the ignition (but not the engine) ON, if you push the air meter plate, it should cause the injectors to squirt. The gas would then run down inside the bottom of the intake manifold just under the butterfly since the engine isn't running and sucking it into the cylinders. I've never worked on an M102, but I am assuming the setup is similar to M103.

Try using a mechanic's stethoscope on the injectors. When you push the air meter plate with ignition ON, you should hear them squirt.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition