shuvool
New Member
I posted this on the other expedition forum, but it's only had 33 views and no replies, and it seems like most everyone comes here, so I will copypasta and hope that someone here has had this issue before and can advise.
I have an '01 XLT Expedition that is over 248K miles and is mostly running fine, it is my daily driver, so I guess that counts for something in the durability department. A while back, I had some issues with the engine missing under load, and it turned out to be a cracked intake manifold. I went to the dealer and got a newer manifold (plastic, I believe, is the replacement for the cracking aluminum problem), spark plugs, and coils...and on a whim, I had them put dual pipes on after the muffler (i like the sound, although, it could stand to be a bit louder). I mention all this just to establish that the manifold, plugs, and coils are all new.
Not too long after, I noticed that it still misses, or at least shudders, under heavy load (hills) although the CEL hasn't come on. I can get it to flash by holding 3/4 throttle at 1500-2000 rpm up a hill, after the shuddering becomes severe, but this is avoided by pushing the throttle all the way down and letting the transmission downshift. I also think that it is lacking power. My Expedition is a 2wd but, the 5.4L V8 seems to have trouble breaking the wheels loose from a stop. I stomp on the gas and I just accelerate at a moderate pace. I know this isn't a sports car, but I would think that 300+ ft lbs of torque would smoke the tires from a stop every time, correct me if this is not the case with this vehicle.
Another symptom I have noticed is that it smells like it's running really rich. This is leading me to believe it might be bad o2 sensors, but I have not had any CEL warnings to indicate any faults. I plan on doing the easy stuff first, like cleaning the MAF sensor, looking at the (newish) air filter to make sure it doesn't have like a nest or something on it, changing o2 sensors, and checking the plugs to see if any of them are fouled. Might be a good idea to fix my non working ac too. Hole in a line, and the other day was 112, but that's another project.
Anyways, sorry for the wall of text, is there anything I have missed our should check first? Thanks in advance for any help
I have an '01 XLT Expedition that is over 248K miles and is mostly running fine, it is my daily driver, so I guess that counts for something in the durability department. A while back, I had some issues with the engine missing under load, and it turned out to be a cracked intake manifold. I went to the dealer and got a newer manifold (plastic, I believe, is the replacement for the cracking aluminum problem), spark plugs, and coils...and on a whim, I had them put dual pipes on after the muffler (i like the sound, although, it could stand to be a bit louder). I mention all this just to establish that the manifold, plugs, and coils are all new.
Not too long after, I noticed that it still misses, or at least shudders, under heavy load (hills) although the CEL hasn't come on. I can get it to flash by holding 3/4 throttle at 1500-2000 rpm up a hill, after the shuddering becomes severe, but this is avoided by pushing the throttle all the way down and letting the transmission downshift. I also think that it is lacking power. My Expedition is a 2wd but, the 5.4L V8 seems to have trouble breaking the wheels loose from a stop. I stomp on the gas and I just accelerate at a moderate pace. I know this isn't a sports car, but I would think that 300+ ft lbs of torque would smoke the tires from a stop every time, correct me if this is not the case with this vehicle.
Another symptom I have noticed is that it smells like it's running really rich. This is leading me to believe it might be bad o2 sensors, but I have not had any CEL warnings to indicate any faults. I plan on doing the easy stuff first, like cleaning the MAF sensor, looking at the (newish) air filter to make sure it doesn't have like a nest or something on it, changing o2 sensors, and checking the plugs to see if any of them are fouled. Might be a good idea to fix my non working ac too. Hole in a line, and the other day was 112, but that's another project.
Anyways, sorry for the wall of text, is there anything I have missed our should check first? Thanks in advance for any help
