MandAtaco
Member
2000 LMTD, 3.4, Auto, 4x4.
Yesterday I'm headed back from a 3 day trip with the family and the truck starts doing something funny. I first noticed it when I started climbing a hill on the interstate, truck downshifts from OD to D as it always does, but instead of revving up and powering up the hill, it falls on its face. I kicked the cruise off, get back onto the throttle and it starts climbing as usual. Weird. I chalk it up to maybe the cruise did something funny.
Couple minutes later, another hill, same thing. This time though, when I get back on the gas, it climbs right up to 3400 RPM and cuts power, no shuttering or anything like that, just cuts power.
The interesting thing is, I can hold it to the floor, it just keeps decelerating, until I let completely off the pedal and get back into it then it will climb right back up to 3400RPM exactly and cut power again. If I let half off the pedal and get back into it nothing, I have to let completely off the pedal, like its reseting or something.
I did get it to do it in 2nd gear too, except it would run up to 3800RPM and cut power, got it to do it about 3 times (always 3800RPM Cut out), but didn't do it every time. Sometimes it would run right up to redline.
Never got it to do it in first or neutral.
No CE light, ran the codes and had a PENDING PO171, lean condition. Pulled the MAF and it was covered so I cleaned it and put it back in. I've had this code before though and it never put the truck into a limp mode.
It's not missing, its like someone is throwing a switch, its that fast and absolutely wont make power again until i fully get off the gas and back in it, then its normal right up until that particular RPM.
Seems sensor related to me but not sure which one, any thoughts?
Yesterday I'm headed back from a 3 day trip with the family and the truck starts doing something funny. I first noticed it when I started climbing a hill on the interstate, truck downshifts from OD to D as it always does, but instead of revving up and powering up the hill, it falls on its face. I kicked the cruise off, get back onto the throttle and it starts climbing as usual. Weird. I chalk it up to maybe the cruise did something funny.
Couple minutes later, another hill, same thing. This time though, when I get back on the gas, it climbs right up to 3400 RPM and cuts power, no shuttering or anything like that, just cuts power.
The interesting thing is, I can hold it to the floor, it just keeps decelerating, until I let completely off the pedal and get back into it then it will climb right back up to 3400RPM exactly and cut power again. If I let half off the pedal and get back into it nothing, I have to let completely off the pedal, like its reseting or something.
I did get it to do it in 2nd gear too, except it would run up to 3800RPM and cut power, got it to do it about 3 times (always 3800RPM Cut out), but didn't do it every time. Sometimes it would run right up to redline.
Never got it to do it in first or neutral.
No CE light, ran the codes and had a PENDING PO171, lean condition. Pulled the MAF and it was covered so I cleaned it and put it back in. I've had this code before though and it never put the truck into a limp mode.
It's not missing, its like someone is throwing a switch, its that fast and absolutely wont make power again until i fully get off the gas and back in it, then its normal right up until that particular RPM.
Seems sensor related to me but not sure which one, any thoughts?
