Hey Guys,

The continuing stoooooory (remember the old Muppet Show Veterinarian's Hospital? No? lol) of my M103's decent into madness. Or mine anyway.

Brief History: I came of the highway one day with a shutter from a poor idle/miss. I've been chasing parts in the fuel system ever since & have gone from a miss to a no start in the process. To this point I have replaced 2 injectors that were suspect, the fuel filter (because I had one), and a rebuilt fuel distributor. I have 5.5bar pressure from the FD when I jumper the FPR.

When I put the new FD in, it started right up & idled well other than a miss on #1cyl. I shut it off, found the porcelain was cracked on that plug (not the problem most likely, but I replaced it), but it would not start & run again after that.

Currently the condition is thus: If I let the car sit overnight, it will crank 'til the cows come home & never start. However, if I pull the MAS, jumper #1 & #2 to cycle the fuel pumps, and then crank, it will run but only if I keep foot into the throttle halfway. If I let off, it dies immediately.

When I turn the key on I DO hear the pumps cycling up.

What does this indicate as a possible problem? Is the MAS not keeping pressure up? Or are the fuel pumps failing? Or is something else entirely the problem?

Feel free to ask questions: I've done more than stated here for simplicity. And please toss out ideas. I'm stuck & I need my car back someday...

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Currently:
1972 350SL Euro 4spd
1973 BMW R75/5
1981 BMW R80GS
1995 FZJ80 with OM606 Conversion In Progress