I swapped a 4.7 with a 5.9 complete drivetrain. It runs great. I have an abs light and airbag light on, but I have figured that out and I need to reflash the PCM to match VIN # and mileage with ABS and Airbag module. I can go drive this thing with no problem until it is warm. It runs great and then loads up with fuel and kicks P0172. You can shut it off and start it right back and and runs great. I'm lost I drove it 10 miles that other day without a problem brought it home and the owner came to pick it up and then it started loading up. Any ideas. It still has 4.7 fuel pump I didn't know if when I reflash the VIN and mileage it might fix this problem. It has a full tune up new plugs, wires, cap, rotor, cam sensor, crank sensor. It sounds great when running until it loads and then spits an sputters. It was showing Bank 1 running rich but only has one oxygen sensor before the cat so I was trying to figure out how it tells bank one is running rich.

 

You need to get that PCM reflashed and it will most likely solve your problems. Personally I'm surprised it even runs because realistically the 4.7 and 5.9 are two completely different engines.

 

i agree w/ widow if you are using the 4.7 pcm to run a 5.9 im very surprised that it even runs

 

flashing isn't going to work.

and I'm not going to bite.

Same fuel pump BTW.

/unsub

IndyD

 

Um, yea!


Why would you think a 4.7L motor PCM would run a 5.9L? And second, did you think it was a quick and easy interchange?

 

indy is also right that flash wont fix it, you need to buy the correct pcm

 

I do have the correct 5.9 ECM installed. I know the 4.7 will not work on a 5.9 . The ABS and Airbag computers are still installed off of the 4.7 and I read that with VIN#s not matching they will turn on the ABS and Airbag Light. I didn't know if I still needed to sync the fuel system with the timing since I'm running the 4.7 fuel pump.

 

I knew that it would be a hard interchange. I have not heard of anyone ever doing it and was told at first it was impossible. I like a challange. Nothing is impossible if you can read a wiring diagram and have time and patience.

 

it has been done before, but it is a LOT of work, and es you are correct about the VIN#s needing to match, i think they use the same fuel pump (seems to be pretty stupid to me to use 2 different fuel pumps in the same vehicle)

also there is NO ECM on these trucks, its a PCM, slight difference, but drives me nuts when people mix em up ECM is a FORD term

 

I know it seems stupid, but the two vehicles were only 8 months apart from manufacture date and had different guage clusters, steering column, and dash. I have read somewhere that the fuel pump might need to be re-sync with the compter so that the injectors and timing work together.