Originally Posted by Jrw0001
Oh i also took it up to autozone and had the guy put it on the tester. I had no error codes but he did mention insufficient flow in the secondary. I assume he was talking about secondary air system but he said i need to run a fuel treatment. I had already been running acetone in it to see if that would clean it out. about 3oz acetone to 15 gallons of gas
P0411 Secondary Air Injection (AIR) system upstream flow
* Electric AIR Pump
* Hose from AIR pump leak
* AIR bypass solenoid leak/blocked
* Hose from AIR pump blocked
* AIR bypass solenoid stuck open/closed
Do you still have the AIR pump? Might have a vacuum leak.
Truck 1: 2014 F150 XLT SuperCrew 5.0L V8, Tuned by 5 Star Tuning on 93 Perf/Tow Tune.
Truck 2: 1996 F-150 XL 5.0L V8 | Edelbrock Performer Heads | Edelbrock Performer Truck Intake | BBK Twin 56mm TB | CompCam XE264HR Camshaft | CompCam 1.7 Rockers | PaceSetter LT Headers | Dual exhaust | Heavy Duty 4R70W | 3:55 Ford Racing gears.