I have a 1990 780 with a 4 Cyl B230FT engine. Motor ran perfectly and started right up and drove it on the trailer. Brought it to the destination and the battery was dead so it was pushed off the trailer and charged it over night. Went out today to start it and it just cranked over but would not start.
Here is what I have tried. Replaced the fuel relay, and I can still hear the fuel pump. I have checked the spark and I have good spark at all 4 cyl and I even changed the plugs. I tried using ether and propane with no avail. I have also checked the timing and adjusted it to several different positions and now it is back to the normal timing position but sill no start. I have made those adjustments ad all three points.

Nothing has changed to this car besides being on the trailer and one would think with fuel, spark, air and proper timing the car would at least sputter. but I get nothing.

Please help and thank you!