My F-250 is running very bad, rough idle, and runs very bad when I hit 40+ MPH it feels like the truck is shaking.

I took the truck to a local mechanic and he put it on a machine and it spit out the codes P0261 & P 0263. He said it had something to do with Injector Circuit Low Cyl. 1, and Cyl 1 Center Balance Fault.

Does anyone know what any of this means? The mechanic thinks it might be a bad Cyl 1 but he is not for sure, nor does he have the expertise to work on it.

The truck was running just as fine as ever until Friday when it started acting up all of a sudden. I was kind of thinking it might be a bad or weak FICM. I have already changed the MAF sensor about 6 months ago, changed the ICP sensor 6 months ago, and I changed the EGR about 1 year ago.

Any suggestions...
Thanks in advance,
Joe

 

Not sure, but it's probably a bad injector.

 

Injector cir low indicates possible FICM issue or wiring to the injector. Possibly the injector itself, but I would check wiring first. Pop off the valve cover and inspect the wiring on the injector.

 

Injector circuit codes are generally indicators of a FICM on the road to failure. Monitor the FICM_MPWR pid while the engine is running, should be at or around 48v.