Fuel injector problem
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From: Nottingham, MD
I put the chip in and it still won't start. So, do you think I should switch the harness? I thought they matched up perfect besides the three pins I found. Also the other 2 pins are for the EVOA (electronic variable oriface actuator) which I don't have in the expy anyway. So I accounted for all three pin. From what I can tell the two harnesses match color to color, pin to pin location. I'm pretty much down to no more ideas.
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Joined: Oct 2006
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From: SE Texas
Originally Posted by puppypower
I put the chip in and it still won't start. So, do you think I should switch the harness? I thought they matched up perfect besides the three pins I found. Also the other 2 pins are for the EVOA (electronic variable oriface actuator) which I don't have in the expy anyway. So I accounted for all three pin. From what I can tell the two harnesses match color to color, pin to pin location. I'm pretty much down to no more ideas.
EVOA is for the variable assist steering actuator,so it's a non-issue as well.
JL
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From: Nottingham, MD
I did not change the EEC or the instrument cluster. I though about PATS not allowing me to start. I've had the battery out for a couple of weeks, could that cause an issue with retaining the code? Also if PATS is the problem doesn't it kill the starting circuit so you can't even turn it over? The only thing I don't like about switching the harness is the IAC valve and oil pressure sensor on the 5.4 are in different locations compared to my 4.6 and it doesn't look like the harness is long enough to reach them. Also the DPFE sensor plug is different.
Last edited by puppypower; Apr 17, 2007 at 03:15 PM.
Postmaster
Joined: Oct 2006
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From: SE Texas
Originally Posted by puppypower
I did not change the EEC or the instrument cluster. I though about PATS not allowing me to start. I've had the battery out for a couple of weeks, could that cause an issue with retaining the code? Also if PATS is the problem doesn't it kill the starting circuit so you can't even turn it over? The only thing I don't like about switching the harness is the IAC valve and oil pressure sensor on the 5.4 are in different locations compared to my 4.6 and it doesn't look like the harness is long enough to reach them. Also the DPFE sensor plug is different.
JL
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From: Nottingham, MD
Problem Solved
Ok, after several hours of pouring through wiring schematics, connection diagrams, and test procedures last night, I realized that (don't laugh) I was testing the PCM to injector signal incorrectly. There is constant 12v to the injectors and the PCM grounds individual injectors to fire them. When I tested the circuit I had the test lead hooked up to the neg battery term. So I got the 12v signal when probing the one pin but forgot to change the lead to the positive battery term to test the PCM side so, my test probe did not light. I went to check it today and guess what. It's firing. That leads to the injectors themselves. Swapped out one injector from my 4.6 and the engine started. The engine sat for awhile before I put it in and I guess the injectors locked up. It sucks I have to replace all eight of them. But they are definally not working. I never have been so excited to hear the engine spit and sputter and cut out. Just think about it, I'll be driving it tomorrow 
. I can't wait. I sure miss her! Thanks for all the help and sorry for the wild goose chase.
. I can't wait. I sure miss her! Thanks for all the help and sorry for the wild goose chase.
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Joined: Oct 2006
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From: SE Texas
Originally Posted by puppypower
Ok, after several hours of pouring through wiring schematics, connection diagrams, and test procedures last night, I realized that (don't laugh) I was testing the PCM to injector signal incorrectly. There is constant 12v to the injectors and the PCM grounds individual injectors to fire them. When I tested the circuit I had the test lead hooked up to the neg battery term. So I got the 12v signal when probing the one pin but forgot to change the lead to the positive battery term to test the PCM side so, my test probe did not light. I went to check it today and guess what. It's firing. That leads to the injectors themselves. Swapped out one injector from my 4.6 and the engine started. The engine sat for awhile before I put it in and I guess the injectors locked up. It sucks I have to replace all eight of them. But they are definally not working. I never have been so excited to hear the engine spit and sputter and cut out. Just think about it, I'll be driving it tomorrow . I can't wait. I sure miss her! Thanks for all the help and sorry for the wild goose chase.
. I can't wait. I sure miss her! Thanks for all the help and sorry for the wild goose chase.JL
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From: Nottingham, MD
I replaced the injectors. She started but it was touch and go for about 10 min. Then she purrrred like a kitten. No leaks either. Yeah!! I'm so used to the way the 4.6 ran with a bad cylinder that the 5.4 impressed me to no end. I haven't even opened her up yet. I'm letting the engine become used to running again and taking it easy on it. I still have to tune it for WOT. But so far so good. Now my next project is replacing the leaking pinion and axle tube seals.... and then new rotors... and balljoints.... etc...etc it's neverending 
See ya on the forums. Chris
See ya on the forums. Chris
Glad you got it going. A $10 noid light would have saved you alot headache.
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Senior User
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From: Nottingham, MD
I agree. But I couldn't find one. In matter of fact, when I went to the auto part stores and ask for a noid light they looked at me like I had two heads. 
Gotta love these guys.
Gotta love these guys.
Last edited by puppypower; Apr 20, 2007 at 05:42 AM.
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Senior User
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From: Nottingham, MD
Here's another one. I went to the local ford dealer to get my flexplate for my 4R70W tranny. Since the expy never came with 5.4 to 4R70W tranny setup, they couldn't help me since it wasn't on there computer. When I told them to look it up on the 150 truck since they use the same parts and had that setup they couldn't believe those parts would fit. That on top of the fact they couldn't believe I was actually swapping the engines. I spent 45 minutes there explaining to them what I was doing and what I needed. I had to hold thier hand. I tell ya, it like they never heard of guys doing something out of the ordinary.