All the injectors are actually wired in parallel. +12 goes to the
injectors and the ECU completes the ground path. Once each engine
revolution, (every other ignition pulse), the injectors will "fire". The
ECU will determine the length of this pulse based on temperature, air
flow meter, (flow volume and temp), and then ultimately O2 sensor
feedback. The fuel pressure regulator also helps modify the injection
quantity by adjusting for manifold pressure or lack there of, (vacuum).

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of Darren Lastfogel
Sent: Monday, January 24, 2005 2:39 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Bosch injector

How do they fire? Pulses per ignition discharge? is it a dwell?  This is
the
question going around the office.