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Just guessing that you have some version of EZK Ignition, because you have a Crank Position Sender. My experience is on 240, not 700 or PRV, but EZK should be basically the same for all, except maybe for wire colors.
the blue wire at the coil, if i feed 12v+ to it the fuel pump cycles on for a few seconds,
• How/why are you "feeding +12v to the Coil? It's normal to get+12v on the blue wire (coil terminal #15?) with the key on. You might be somehow back-feeding a pulse to the EZK controller, which then lets the FI run for a few seconds. Could be semi-normal.
if i crank over the engine the injectors pulse and pump runs,
• That's because:
1 - the EZK is getting CPS pulses,
2 - "thinks" its generating spark OK,
3 - and signals the FI system to go.(should also be pulsing Power Stage to fire the coil at the same time)
(CPS pulses go only to the EZK, not to FI).
EVEN when the box behind the air filter is unpluged the injectors still pulse.
• That "box" sounds like the EZK Power Stage I keep suggesting. If so, it has nothing to do with injectors—but should be triggering the coil #1 terminal. Need to know more about it -- 5 wires? Including a R-W one and a Blue one? (Peel back the rubber boot on the plug to see wires.)
but if i unplug the crank sensor the pump and injectors stay off while i crank.
• Normal — No CPS signal to EZK means no EZK "Spark OK" signal to FI ECU.
so this system must be different for the 2.8v6. do you know how to identify what systems i have?
• Is your engine a B28 or B280? I think the B280 EZK "basics" are probably the same as I've been describing. Decal under the hood should tell which engine.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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