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  #1  
Old 09-03-2010, 11:51 AM
THETROOPER THETROOPER is offline
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Default 2.9 wont start

Hi all. I'm working on this truck and its killing me. I had it running and then I went to flush the radiator and wound up replacing it. while filling the new radiator the truck died. Now it wont start. I've replaced cap and rotor plugs and wires, coil, icm. The plugs are getting spark. I'm getting fuel to the fuel rail. I tried starting fluid and the engine fired and burned off the fluid then died. I just checked the voltage to the injectors and I only got 3 volts. Help please.
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Old 09-03-2010, 12:15 PM
Psychopete Psychopete is offline
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Default 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.

Last edited by Psychopete; 09-03-2010 at 03:47 PM.
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Old 09-03-2010, 12:26 PM
THETROOPER THETROOPER is offline
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Default Re: 2.9 wont start

awesome thanks I'll get to work on it. I just checked voltage at two of the injectors and got nothing.
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  #4  
Old 09-03-2010, 12:31 PM
Psychopete Psychopete is offline
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Default Re: 2.9 wont start

The red wires at the injectors are all spliced together, just one single wire runs to them.. Computer grounds them to turn them on, so they're always hot with the key on run.
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Old 09-03-2010, 01:13 PM
THETROOPER THETROOPER is offline
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Default Re: 2.9 wont start

I got 12 volts at the air bypass. I'll get to work on the fused 12v source idea. Also this is a manual transmission so does the clutch need to be pushed in for the fuel injectors to get power?
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  #6  
Old 09-03-2010, 01:45 PM
Psychopete Psychopete is offline
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Default Re: 2.9 wont start

Nope, that switch only affects the red / light blue wire that runs to the starter solenoid to turn over the starter - so that seems to be working OK.
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Old 09-21-2010, 11:16 AM
THETROOPER THETROOPER is offline
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Default Re: 2.9 wont start

So I hot wired the injectors to the battery and it runs. But all 6 injectors fire at once rather than 3 at a time so it's really rich. Also I found no wire breaks or bad connections. And I need to replace another starter.
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