Re: 2.9 wont start
Should have 12 volts at the red wires..
An electrical vacuum trouble shooting manual would be a huge help on this as reference..
The injector power source is coming from the switched side of the computer relay. Eg, it gets powered when the computer relay is energized from the 12v from the key switch. Hard to explain, but it's obvious looking at a wiring diagram. Autozone.com has diagrams, need to sign up and they're hard to find, but can't vouch that they're any good and I guess they're better than nothing.
There are other sources that run from that splice that you could test to isolate where it's broken:
Red wire at fuel pump relay harness,
Air bypass solenoid,
EGR control solenoid,
Pins #35 and #58 at the actual computer
Got 12v at any of these spots, but 3v at the injectors, sounds like the wire is broken somewhere in your injector harness or one of the connectors is damaged (leaky heater core hose?). IMHO, if it were me, I would tempted to apply a good 12v FUSED source to a red wire at the injectors and see if they start working. If they do, and you have 12v at any of the locations I've listed, then need to get into the wiring and isolate where the bad connection is.
1987 Ford Ranger Short Bed 5.0L/T-5 Project
1988 Ford Ranger Long Bed Parts Truck
1993 Ford Tempo 2.3L OHV HSC Auto - D/D Stock.
1999 Honda Accord VTEC Auto
2002 Dodge Caravan - 3.3L Auto
Last edited by Psychopete; 09-03-2010 at 03:47 PM.