The truck is down on power and threw P0171 yesterday. It drives okay at low throttle position, but falls on its face if I attempt more than part throttle. If I hold the throttle there, the rpms will climb very slowly despite the fact it sounds like I have it at WOT, and then the truck will get power back (relatively speaking) at 2500-3000 rpms.
I also had trouble maintaining speed up a gradual incline until the truck downshifted. This is not normal. I drive that incline all the time and should accelerate up the hill in gear, without downshifting.
I have to let it cool down again, but it seems much worse when hot.
I have Torque. The O2s (Bank 1 Sensor 1) seems to be bouncing around pretty good. Sensor 2 bounces around sometimes, but also flat lines or trend lines at times. I need to investigate. The manifold air pressure responds to the throttle nicely - almost too fast, meaning it hits 12 at very little throttle. Not sure if this is normal. It seems to be holding a good vacuum.
I cannot get fuel pressure readings in Torque. I assume this is no surprise?
Sorry for the book. Is there anything else I can do with Torque to diagnose, or am I headed to the shop to get hooked to the scanner? Thanks.
Edit - I forgot to mention. The intake manifold is tight, the throttle body is clean, the air filter is new, and the plugs have <6k miles on them. This is the 'new to me' motor with 44k on the clock.
I also had trouble maintaining speed up a gradual incline until the truck downshifted. This is not normal. I drive that incline all the time and should accelerate up the hill in gear, without downshifting.
I have to let it cool down again, but it seems much worse when hot.
I have Torque. The O2s (Bank 1 Sensor 1) seems to be bouncing around pretty good. Sensor 2 bounces around sometimes, but also flat lines or trend lines at times. I need to investigate. The manifold air pressure responds to the throttle nicely - almost too fast, meaning it hits 12 at very little throttle. Not sure if this is normal. It seems to be holding a good vacuum.
I cannot get fuel pressure readings in Torque. I assume this is no surprise?
Sorry for the book. Is there anything else I can do with Torque to diagnose, or am I headed to the shop to get hooked to the scanner? Thanks.
Edit - I forgot to mention. The intake manifold is tight, the throttle body is clean, the air filter is new, and the plugs have <6k miles on them. This is the 'new to me' motor with 44k on the clock.
