1996 BMW 328 fuel delivery

1996 BMW 328
Avatar
328IS
  • MEMBER
  • 2 POSTS
Electrical problem
1996 BMW 328 6 cyl Two Wheel Drive Manual 100k miles
----------------------------------------------------------------
my fuel pump only runs when power is applied directly from the battery. the relay is operating correctly. although the pump runs with the battery powering it and the fuel is pressurized at the fuel rail the car will still not start. i have good compression and good spark. Shouldn't the vehicle still be able to fire if i have power to the pump?
Jul 5, 2008 at 6:10 PM
Advertisement
Avatar
DOCHAGERTY
  • CAR REPAIR CONTRIBUTOR
  • 9,606 POSTS
The item you have overlooked is if the fuel injectors are actually injecting fuel, check for an injector signal and let us know.
Jul 5, 2008 at 7:42 PM
Avatar
328IS
  • MEMBER
  • 2 POSTS
How do i go about checking for an injector signal? I don't think I have one, so what would my next step be after confirming this?
Jul 9, 2008 at 9:38 AM
Avatar
DOCHAGERTY
  • CAR REPAIR CONTRIBUTOR
  • 9,606 POSTS
If there is spark then a bit of carb cleaner sprayed into the intake will get the engine started. The fuel injector signal or lack there of, can be determined by removing the electrical connectors at the injectors and installing a small light bulb called a "noid" light and watch to see if it lights up indicating fuel being injected. It is possible the computer that controls spark and fuel is faulty. I recommend seeking out a local BMW shop for the diagnostics.
Jul 9, 2008 at 8:26 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.