Another new problem! 2005 auto truck, lopey idle, when reved up, it stays reved.

[Blacksdieselhp]

When I first heard this truck, I thought FCA was bad, but I reved the engine up to see if it smoothed out. When I reved it, it still ran rough. It juumped to 2500 rpms and stuck there. It was lopey then too. went from 2400-2600 rpms. I had to cut the ingition off to get it to stop reving. Codes were P2509, P0483, and P0251. One is an injector pump code. But I'm not sure if thats it or not. Any ideas?

 

[Trashdawg]

P2509: Powerdown data lost error: loss of voltage detected at the ecm for a calibrated amount of time.

P0483: Fan Speed

P0251: CP3 Pump regulator control: ECM detects a discrepancy between the PWM supplied to the Electronic Fuel Control Actuator and the PWM returned from the Electronic Fuel Control Actuator.

 

[sag2]

Could be contamination. If the FCA can't be controlled or an injector(s) is stuck open the engine speed will stay high when the rail pressure comes up.