2001 Expedition 5.4L- Rough Acceleration
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Senior User
Joined: Oct 2003
Posts: 351
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From: Sullivan, IL USA
2001 Expedition 5.4L- Rough Acceleration
I recently bought this, it has 68,000 mi. It started running ruff, and Service Engine light came on. I took it to a Ford shop they diagnosed it as #2 bank O2 Sensor. I replaced it and it did help. But, it seems to still have a slight "Stutter" in acceleration. I am new to this motor, not to sure of it's general troubleshooting yet.
Hotshot
Joined: Jan 2004
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From: St Louis
Actron makes both code readers and scan tools. There is a significant difference in the device's capabilities between the two categories. See Actron's website for more details.
If you own or intend to own vehicles made in roughly '04 and later, be sure you get a CAN capable or upgradeable model.
Steve
If you own or intend to own vehicles made in roughly '04 and later, be sure you get a CAN capable or upgradeable model.
Steve
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Junior User
Joined: Feb 2006
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From: Ontario
First time givin info on here but sounds like u have a misfire somewhere, i'll bet its one of your coils you might want to check this out, i just went through this on my 1997 expedition, but the milage on my truck was 232,000 kilometers or about 143,000 miles.
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Tuned
Joined: Sep 2003
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From: north carolina
I would not immediately blame the O2 sensor. Sometimes a vacuum leak can fake the computer into overcorrecting, causing a bank to lean out, which then causes the O2 sensor to sense out of range.
A common problem on 5.4L Tritons is a hole in the vacuum elbow connecting to the PCV valve. This elbow is not easy to see or get at, as it sits at the back of the engine under the intake. You pretty much have to feel for it. Anyway, the elbow deterioration is common failure, and will cause all sorts of symptoms, like rough idle, poor acceleration, and even an O2 lean condition.
A common problem on 5.4L Tritons is a hole in the vacuum elbow connecting to the PCV valve. This elbow is not easy to see or get at, as it sits at the back of the engine under the intake. You pretty much have to feel for it. Anyway, the elbow deterioration is common failure, and will cause all sorts of symptoms, like rough idle, poor acceleration, and even an O2 lean condition.
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Originally Posted by jle70
I will check the pcv connection out. Thanks for all the input. Is there a better replacement that won't crack open or leak?
You have to get the entire assembley from the dealer. It comes with new pcv valve, hose, elbow. It's possible that the pcv elbow is cracked at the intake.
But if it's not giving a misfire code, and reads o2 sensor, that could be it. PCV assembly runs about $35 at the dealer.
Tuned
Joined: Sep 2003
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From: north carolina
Not that I have heard about. The connector is elbow, and the heat back there deteriorates the rubber over time. Any rubber replacement will dry rot and eventually crack. You just have to be aware this is a common problem, and check it whenever you have acceleration stumbles or rough idle conditions. BTW, you have to feel for this connector---its impossible to see without a mirror. The hole usually occurs right in the bend of the elbow.
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Senior User
Joined: Oct 2003
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From: Sullivan, IL USA
OK, I just checked the PVC hose and elbow. I also checked all Primary resistance on bank #2 coils, since that is the side that gave me a bad O2 Sensor. They all were fine. I guess I don't know what to do at this point. Wait until I get Scanner that will pick up live data?