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T77911S T77911S is offline
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Join Date: Oct 2006
Location: MYR S.C.
Posts: 13,433
what year is it?

there is a speed relay under the seat that tends to have bad solder joints. with it randomly cutting off, it could be this. this controls the fuel pumps and the O2 sensor.

i know the fuel system very well but i dont have any drawings for anything else.
the speed relay also controls the O2 sensor in that it cuts it out at a certain RPM, i think 3k, dont remember.
someone said the black relay you pulled is for the O2, if it is running fine without it, i would look into that circuit.
check your fuses too. they can be very intermittant.

all this has been pulled from my car so i only know bits a pieces of the 930. if someone could send me a diagram of the igniton system that would be a big help.
86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
Old 06-24-2013, 08:23 AM
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