Fuel injector problem
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From: Nottingham, MD
Fuel injector problem
I'm finally done swaping out my 4.6 for a 5.4l Now she won't start up. I know I have to tune the ECC for the 5.4 but everyone I have talked to on the forum and else were said the engine should at least start. I have narrowed it down the the fuel injectors. They are not firing. I hit the engine with either and she fired up. That comfirmed it. I have fuel going to the rails but don't know the pressure yet. I also confirmed no fuel is getting in the cylinder by pulling a plug. Should I just wait until I tune my ECC to see if that will fix it or is there another problem with the system? I plan the test the electrical connections tommorrow with a "noid" light to actually comfirm an electrical problem. Any other suggestions? Thanks, Chris
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From: Nottingham, MD
Originally Posted by torkum
Does your fuel pressure regulator have a electrical plug on top? Is the tach moving when you crank the engine.
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From: Nottingham, MD
Originally Posted by LxMan1
It should still run. You are missing a signal fom somewhere. Cam sensor, crank sensor?
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From: Nottingham, MD
Alright, heres an update. I checked the 42 pin connector and 16 pin connector between the 4.6 harness and 5.4 harness. I found the 5.4 harness is not using 3 pin locations that the 4.6 is using. On the 5.4 42 pin connector pin 17 is not used. All other locations and wire colors match on that connector. For the 16 pin connector pins 9 and 10 are not used. Can anyone that has a good wiring diagram tell me what these pins are for. To clarify, my truck has a 4.6 connector that has three pins that the 5.4 engine harness does not have. These are the connectors that are on the firewall below the soleniod toward the passenger side. I wonder if I switch the harness will that fix the problem. Thank you for any help.
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From: Nottingham, MD
Ok, I had time to think. Everything the engine needs is on the wire harness so changing the harness won't change anything. The only thing I'm worried about is one of those pins might be a feedback to the PCM. Like LxMan1 said I'm missing a signal somewhere. I'll keep working on it
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From: Nottingham, MD
Well I found out my 4.6 engine had a IMTV (Intake Manifold Tuning Valve) that my new 5.4 does not have. That accounts for two wires that are now not used. I can't find it on any of my crappy wiring diagrams of course. Do you think this could cause the problem. I appericate any help please.
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From: Nottingham, MD
Originally Posted by LxMan1
It's possible, I would think that it would show a code for it missing.
Thanks, Chris
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From: Nottingham, MD
Originally Posted by LxMan1
Can you remove just the actuator and plug it in just to see if it will start?
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From: Nottingham, MD
Originally Posted by LxMan1
Oh, I thought that you still had the 4.6 harness.
No chance of getting the donor truck PCM?
No chance of getting the donor truck PCM?