so much good info from others. I'll print out for my own use. Too much to remember. THX!
Steve

Alright, no vacuum leak that i can detect. No start with or without MAF, pulled the plug and applied conductive grease. We have spark from starter to distributor. It doesn't seem like the engine is getting any fuel. Fuses all check out, replaced lead from starter to distributor. Where next? When we replaced the radiator I did drop A LOT of coolant onto the alternator did I ruin it? We've been cranking it on a trickle charge and still nothing, not even a cough. Its all so mysterious because we started it and drove it out of the garage and had it running perfectly for 15 minutes then no start.

I will try all of these checks when I see the car tomorrow. Just to be clear, AMM is MAF right? Could some moisture in the filter cause the MAF/AMM to malfunction? I'm hoping for the best though.

After I found a pushed in pin on the AMM in our '88 745 GLE, I did three things -

1 - I peeled the boot back on the female side and when the pins were in their proper place, I made a line across the wires with a Sharpie. Whenever I plugged the AMM in, I peeled back the boot to see if all the pins were seated, then I folded the boot back.

2 - In my car, the wiring to the AMM was routed around something (I forget what it was!) - I rerouted the wires in front of the item and therefore the wires were pushed toward the plug instead of being pulled from it.

3 - I made a tag out of flat plastic and attached it near the plug with a warning about the bad pin - for others to hear of the problem.

4 - (I know, I said three) I showed the problem to my wife and two daughters in case the problem popped up again. (Daughters? - actually I taught them some things about cars and made them check tire pressures, fluids, and a visual of belts and hoses every Saturday, or they could not use our cars.) Christine even changed a flat on a Dodge FWD in a swamp in Saskatchewan!

Interestingly, I had the problem right after a tune up by my dealer!

Even if your problem is not the plug, you might follow my advice to avoid a future problem.

Check the small hard plastic hose from the header panel going into the filter box.
Check that you closed the filter box correctly. Check the small hard plastic hose to maf is snug onto maf. Did you remove the accordion hose? check it for holes.

A loose wire or hose should be pretty obvious. Got spark ? Fuel Pressure ? Is the connector for the AMM fully home ? Did one of the pins push back when you plugged it in ?

Greg