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How are the injectors fired on this system with only 2 control wires one for each bank? Does it fire all 4 inj at the same time? Also what inputs are needed to fire the injectors on this vehicle. I have fuel pressure and power to injectors but no pulse, cant find any specific description and operation in service data to answer this question or on google. Post has been up for almost a day, update is i checked all powers and ground to computer all check good. I checked PIP signal to computer and have a steady 12 volts. Checked spout out of the computer and i have a 0-10 or 11 volts square wave.
Last edit: 2 years 3 months ago by youngmarlin. Reason: updating information
Sorry you're not getting any replies.
It is kind of a one-off system. I know I don't see Fords of that vintage, and the ones I have worked on in the past were sequential multiport injection. As you noted, and as I saw on the diagram myself, the injectors are group fired. But apparently not bank to bank?
Wish I had some worthwhile advice for you, that's why I didn't respond, but I don't want you to feel like you're getting the cold shoulder. Maybe getting this thread bumped up the list again will get the wheels turning.
the ford ecm's of this vintage tend to have the capacitors fail in the ecm due to them leaking on the board and corroding out the printed circuits/ water intrusion. check powers and grounds at ecm and check the wires going from injectors to ecm with a incandescent test light or noid light.
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