What Is Going On!
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Joined: Feb 2004
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What Is Going On!
Hello everyone, My '98 Expedition will not idle so I have to feather the gas pedal to keep it running, also the check engine light came on. The problem started after my wife filled the tank with gas. She drove it about 8 miles without any problems . I tried starting it about an hour later and the vehicle was difficult to start and ran very rough. I feel it that it might be water in the fuel but I want to get some feedback from the "EXPERTS". THanks in advance
Logistics Pro
Joined: Oct 2000
Posts: 3,960
Likes: 5
From: All over Texas
Could be bad gas, bad IAC, bad coils/wires (depending on your engine) or any other number of things. If the light is still on, head to Autozone and have them read your codes and go from there....hopefully you'll be able to pinpoint the problem.
Good Luck
Good Luck
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
Re: What Is Going On!
Originally posted by FORDNOMORE
My '98 Expedition will not idle so I have to feather the gas pedal to keep it running...
My '98 Expedition will not idle so I have to feather the gas pedal to keep it running...
Kidding...
My vote and ONLY vote is for the IAC. It is right here...
Somewhat easy to install. You can pull it off first (2 bolts) and try clean it with carb cleaner or just replace it. You can get 'em at NAPA, etc.
It is probably the reason for throwing the check engine light too, BTW.
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Hee Hee, I thought that my name would get some attention.
Anyhoo, I took the plastic cover off and removed the bypass valve. After I removed the valve I noticed a large vacuum port at the back of the intake manifold open to the air. I intalled the new valve(just because it was so difficult to remove the old one) and started the engine with my finger over the vacuum port and it ran fine. The engine ran until I removed my finger from the vacuum port. I looked everywhere for a loose vacuum line, but I could not find one. Maybe there was a cap that fell off. Does anyone out there know?. Thanks
Anyhoo, I took the plastic cover off and removed the bypass valve. After I removed the valve I noticed a large vacuum port at the back of the intake manifold open to the air. I intalled the new valve(just because it was so difficult to remove the old one) and started the engine with my finger over the vacuum port and it ran fine. The engine ran until I removed my finger from the vacuum port. I looked everywhere for a loose vacuum line, but I could not find one. Maybe there was a cap that fell off. Does anyone out there know?. Thanks
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
Originally posted by PaulC
That's the location on a 5.4 engine.
That's the location on a 5.4 engine.
But they, as you know, are the same.Thanks for the info on the 4.6L location. I actually, or someone should have, asked him what engine he's got!
By FORDNOMORE
Maybe there was a cap that fell off. Does anyone out there know?.
Maybe there was a cap that fell off. Does anyone out there know?.
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New User
Joined: Nov 2003
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From: myrtle beach
Mine was a 98 that did exactley same thing and started after wife got gas and I thought same thing but it was the IAC and cost me $135 at dealer and it works like a charm now that IAC was replaced.
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From: new orleans, la
I have a 5.4 with a bad IAC--how the heck do you get a socket to turn the bolts?? It's really a tight squeeze even to get a socket on the bolts, much less ahving enough room to turn them. Can anybody give me a hint?
Logistics Pro
Joined: Oct 2000
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From: All over Texas
Originally posted by bingo begone
I have a 5.4 with a bad IAC--how the heck do you get a socket to turn the bolts?? It's really a tight squeeze even to get a socket on the bolts, much less ahving enough room to turn them. Can anybody give me a hint?
I have a 5.4 with a bad IAC--how the heck do you get a socket to turn the bolts?? It's really a tight squeeze even to get a socket on the bolts, much less ahving enough room to turn them. Can anybody give me a hint?