6.4 Intake manifold to 5.7 throwing codes P0174 p0701 p0300

[slappinram]

Put on on the 6.4 truck mani on my 5.7 with 6.4 injectors.

Everything is hooked up correctly and checked multiples times. Tune triple checked by JG.

truck idles fine at start then instantly starts to idle a little rough and throws those three codes. Sometimes it’ll only throw p0300.

My next option is smoke test for vacuum leaks or test each 6.4 injector. I had to swap back to my 5.7 mani cus it’s the daily driver. I’m debating putting on the 5.7 injectors because I do have the spacer to see if that could be it but JG did say the fuel looked fine and looks like either a drivers side exhaust leak or vacuum leak.

Anyone have these codes ?

 

[Daw14]

Any results ?

 

[DILLIGAF]

You need a tune when you run 6.4L injectors ! Thats why you're having issues.

 

[AzCats]

Double check the wiring connectors to the coil packs and ensure all the wiring sensors are snapped in tight. When I did my 6.4 manifold upgrade while pulling out the 5.7 manifold, I accidently damaged one of my coil pack connector plugs and didn't know until I got some codes. Once I repaired the wiring connector it was all good. Also I used the 5.7 injectors with the spacers and it worked great.