Hey all,
The old 2000 Expedition (5.4l, AWD, EB Package) has been doing well, till now. I have over 250K miles, am enjoying it and want to keep it going, but I have a problem that has been going on for about 2 months now and it has me stumped.
A little history, I have had COP #4 (back side passenger side) go bad two times over the last 10 years. It has always thrown a code, and I economize by picking up used ones at the local salvage yard. I do know that that failure feels like and am prepared with more COPs to change them out if needed.
The new problem is similar, but with two twists:
1. From a cold start, the engine runs like brand new, for about 7 minutes.
2. After 7 minutes, when accelerating from a stop light, or just trying to keep up from 35-45 mph in overdrive, the engine has a significant studder. It seems to still be making power, and if I turn off overdrive, the problem diminishes, but does not go away.
3. I have been trying to keep it in the studder zone to set a code (or even show up in the pending codes list). Try as I might, it will not set a code.
Does anyone have any ideas. Right now, I will probably try the following:
1. Verify all vacuum hoses are intact and not leaking.
2. Change TPS (saw a similar thread in the F150 Forum and a fellow there was adamant that had a high potential of being the problem)
3. Maybe install a full new set of COPs (can't be cheap forever I guess)
Does anyone else have any ideas on this? Like I said, the two twists in this are: 1. problem only starts after the engine is warmed up, and 2. no code is being set.
Thank you for any help you can give on this!!!
Johnny O
The old 2000 Expedition (5.4l, AWD, EB Package) has been doing well, till now. I have over 250K miles, am enjoying it and want to keep it going, but I have a problem that has been going on for about 2 months now and it has me stumped.
A little history, I have had COP #4 (back side passenger side) go bad two times over the last 10 years. It has always thrown a code, and I economize by picking up used ones at the local salvage yard. I do know that that failure feels like and am prepared with more COPs to change them out if needed.
The new problem is similar, but with two twists:
1. From a cold start, the engine runs like brand new, for about 7 minutes.
2. After 7 minutes, when accelerating from a stop light, or just trying to keep up from 35-45 mph in overdrive, the engine has a significant studder. It seems to still be making power, and if I turn off overdrive, the problem diminishes, but does not go away.
3. I have been trying to keep it in the studder zone to set a code (or even show up in the pending codes list). Try as I might, it will not set a code.
Does anyone have any ideas. Right now, I will probably try the following:
1. Verify all vacuum hoses are intact and not leaking.
2. Change TPS (saw a similar thread in the F150 Forum and a fellow there was adamant that had a high potential of being the problem)
3. Maybe install a full new set of COPs (can't be cheap forever I guess)
Does anyone else have any ideas on this? Like I said, the two twists in this are: 1. problem only starts after the engine is warmed up, and 2. no code is being set.
Thank you for any help you can give on this!!!
Johnny O