I recently perform a ENG overhaul on my 2007 LS460. lexus JTHBL46F875015747

replacing the following parts that were crack and stiff

1. all HOSE FUEL VAPOR FEED
2. all HOSE, VENTILATION
3. all HOSE, FUEL
4. Engine Crankcase Vent Valve
5. Beck Arnley Fuel Injector 8
6. Direct Fuel Injector 8
7. valve cover gasket were leaking oil
8. intake manifold gasket
9. set of new coil and spark plugs
10. mass air flow sensors 2
11. Variable Valve Timing (VVT) solenois
12. B1 and B2 Oxygen Sensor 4
13. all Engine Camshaft Position Sensor 5

i started the car without any problem, run smooth on idle, took it for a ride and will stall and will not acelerate, the eng light came on. run the techstream software and the folliwing code show up.

1. engine code P1278 Port Injector Circuit #3 High
2. P0303 code indicates a misfire in engine cylinder 3.

​​​​​​​trobleshot step perform.
swap coil and spark plug from on 1 pos to 3 same result .
one part i didnt replace is the Engine Wiring Harness NO.5 82125-50080. i ordered waiting for the part
some of the direct injectors.connectors were brittle

if any one has deal this this codes please let me know.
I need to test the PCM or ECU conection before removing the instake manifold again.
any diagram or pictures or stepswill be apreciated.
and should i replce the fuel pressure sensor since is located under the intake manifold
A bad fuel pressure sensor can cause a range of issues, including difficulty starting, stalling, rough idling, and decreased fuel efficiency. Other symptoms include a check engine light, reduced power, and engine misfires.

 

You have an engine code related to a fuel injector and you have swapped the spark plug and the coil? I don't follow...

 

Parts cannon? Nah, we are using a full on parts artillery battalion

 

the troubleshooting steps suggest to swap the coil and spark plug with another cyl to see if the problems is the park plug and coil gone bad.

 

The code is related to one of fuel injectors. Why would the code move if the injector stays at the same place?