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Old 07-08-2013, 10:59 PM
LandYaghtLover's Avatar
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Join Date: Jun 2010
Location: Green Bay, WI
Posts: 1,341
Any BMW M70 techs here?

Got my 750il all back together. Swapped in replacement cams, etc. Very, very sure timing is right (had the right tools) and there were no issues getting the job done. The oil bar had come off both sides, hence the cam replacement.

Anyway, its all ready to roll and I was so happy to get this project this far but it wont fire up. Cranks over and will sputter a few times if its been sitting. Then all I have is wet injectors. Spark was checked a few times and it good. Even changed to larger tipped copper plugs on one side. Some said platinum tips are small and can be an issue in this engine. Fuel pressure fine too.

What I found is constant power at injectors. Some 7v, some 12v. There should be no voltage. Torn apart most of the harness and found no major issue. Pulled relays, reset computer, pulled battery for a night, etc.

Can not find reason for voltage at injectors. Next I will pull the rails and see if they are indeed constantly firing (the 12v ones). Or its its just a stray voltage with no real amperage behind them - although that still would not explain why it floods so fast.

Note: When it floods there is no sputter and flooding happens fast. If I let it sit over night I will get a subtle sputter again then nothing. If I pull the injector connections and crank it, it will start to sputter again as the extra fuel is blown out. Rinse, repeat.
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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car
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