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Hello I have a 2004 super crew with a 5.4 truck has been sitting for years. My son and I have been working on it we have gone through the fuel system and have fuel at the filter. The truck will fire on starting fluid but won’t fire otherwise. I unplugged an injector connector and had 12+ volts while my son cranked it over. I also put a dowel on the injector while he cranked it and couldn’t hear it click, I don’t know if you could hear it anyway by just cranking it over. During the course of our work we had the intake off and the fuel rail was drained and sat dry for months. Could all of the injectors have frozen during this time? The truck has been in a heated garage during this entire process.
Hello I have a 2004 super crew with a 5.4 truck has been sitting for years. My son and I have been working on it we have gone through the fuel system and have fuel at the filter. The truck will fire on starting fluid but won’t fire otherwise. I unplugged an injector connector and had 12+ volts while my son cranked it over. I also put a dowel on the injector while he cranked it and couldn’t hear it click, I don’t know if you could hear it anyway by just cranking it over. During the course of our work we had the intake off and the fuel rail was drained and sat dry for months. Could all of the injectors have frozen during this time? The truck has been in a heated garage during this entire process.
pcm supplies that pulsed ground for injectors to fire at correct time. So absent any other testwork/info, I’m guessing that they may not be firing due to lack of that ground pulse?
you could:
-invest in a “noid light” to see if they are electrically firing
- pull out the rail and physically watch to see if they are spraying
- acess pcm data and see what pcm is showing for fuel pressure at the rail (readily avail with scanner)
See what you can figure out and post back with more info.
Yes, noid light or make your own
Highly unlikely that all 8 injectors failed while sitting (new ones do come full of solvent)
The sitting for years will contaminate the fuel tank (that and the filter / strainer) (pump) (lines)
Tape a fuel pressure gauge to the windshield for testing while testing the processor drivers with the noid light
You want to see the fuel pressure go down while the injector fires
You can manually pressurize the rail and use a fabricated injector harness to fire the injectors one at a time for testing
That is the easy way to test an injector without a bunch of specialized test equipment
Got a noid light no power to injectors, FRP 58.4 psi. Going to go through fuse panel , check grounds. Any thoughts?
sounds like a good start. Would add:
- have battery tested
- retrace injector harness and look for anything amiss, pinched, unplugged and/or near any of your work around intake
- can’t recall if this was covered yet, but any codes?
Ok so was going through things and thought all the things that we did and thought about the crank position sensor. My son installed the timing cover and apparently didn’t connect it plugged it in and it fired right up! I thank you for your help.
Ok so was going through things and thought all the things that we did and thought about the crank position sensor. My son installed the timing cover and apparently didn’t connect it plugged it in and it fired right up! I thank you for your help.
thats good news. Just curious how it fired/ran on spray without a crank sensor signal? Suppose I could be wrong, but didn’t think there would be fire/spark without crank signal?
04 injectors?
