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ECU - In Put Power Check Under Load
Hey John - I was going over some notes that I'd taken while helping to sort out another "No Injector Pulse" problem on a 1982 928 a while back. There is supposed to be a voltage stabilization circuit inside the ECU that can temporarily keep it's internal operating voltages boosted up (I assume some large capacitors) if the external battery drops below 9 or 10 volts during start. We'd determined that this circuit had failed and was dragging down the internal operating voltage in the old 82 computer I still have - marked bad.
Just a suggestion but you might test your ECU supply voltage during start just to make sure your external power source is over the 10 volt mark.
Good Luck, Michael
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1984 928S - "Miss Purdy"
1987 911SC - "Frau Helga"
1986 930 - "Well Hung"
1975 911 Targa "Blue"
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