Question about 1998 Ford Expedition

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1998 ford expedition won't stay running, i can start it and as long as i keep my foot on the gas it will run, but when i move my foot it dies quickly

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Start with the vacuum hoses on the motor, this will do this. the vacuum hoses are rubber hoses three quarter inch in diameter on down to real small hoses and can be located anywhere on the motor or under the hood. Look for a hose off, cracked, broken, or loose at a connector.

Posted on Mar 16, 2011

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Its not the throttle position sensor! I just dealt with this 30 minutes ago... A large EVAP leak is detected... Which means one of the 3/4 inch vacuum hoses slipped off or is deteriorated! More than likely the hose connection to the back of the "top-middle" section (intake manifold i think). This hose also connects to the valve cover, on the side where the engine oil is added. I dont know the name but its that one. Follow that hose to the back top of the engine... You can barley see if it came off so it's easy to overlook!!!

Posted on May 10, 2012

  • lichoda1
    lichoda1 Jan 10, 2013

    thanks i am going to look for it... got in to mine this morning and yep as long as i keep my foot on the gas it will stay running but if i let off it dies.... i thought it was my batt. i will look for the hose thing hope it works...

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Sounds like hou need a new IAC sensor they go bad all the time its a comon thing in the expeditions mine did the same thing I. replaced the IAC ad bingo runs like a charm they are relativly cheap about 40-50 bucks hope this helps

Posted on Sep 21, 2014

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Posted on Jan 02, 2017

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1 Answer

1998 expedition yesturday was low on fuel got gas drove with headlights on got 4 miles down road vehicle died thought was bad gas 3hrs later vehicle would run but abs light and brake light would flash


There is a problem in the electrics of the vehicle. First place to start is to check the alternator drive belt for condition and tension. Next place is the battery terminals and condition and tension . Third place is to have a load test done on the battery as it may have an internal short and drawing all the current from the alternator. In effect when you add power requirements ( park lights then brake lights then headlights) you are actually using more current than the alternator can supply to keep the engine system running.

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ok i have a 1998 durango with the 5.2L 318 engine. had trouble with a bad cell in my battery. I went out bought an optima red top battery for it 800cca. put it in and had same trouble. No start without putting foot on gas. wouldn't stay running without holding foot on gas. CPU has to relearn it's programming once you unplug it for long periods of time. mine was without power for about 2-3 weeks till i got new battery. Start with this.. first check under air filter make sure a squirrel hasn't made a mess under your air filter and it's clogging the air intake. Then pull off the lid to your injector cover ( the screw down lid coming from the air box ( with air filter in it) to "carb") make sure all your cables move freely. put that all back together and close hood. Start truck with foot slightly on gas pedal to get started. keep it at about 1k to 1500 rpm for about 1-2 minutes. Rev motor to about 2500rpm and let it die out if it will. Get out lock doors with key fob if you have it. if not make sure to lock doors. ( trust me it worked for me) let sit for 5 minutes. come back out and unlock door and relock door 3 times with fob ( if you have it ) or key if you don't have a fob. Then unlock it with the key and enter vehicle. Start truck as before and keep it around 1k to 1500 rpm again for about 30 seconds rev it up and should keep running. Mine did. I think the iac was stuck from sitting and has now since loosened up.
Good luck hope ti works for you.

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all code readers will retrieve information stored while in the on position --doesnt need to be running ---when you rehook up scanner either resubmit or edit request with codes

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1 Answer

98 Expedition..5.4L 4WD..coded bank 1 bank 2....O2 sensors..LEAN....replaced both..no change..still same codes..now it won't stay running. Tried to code again..won't run long enough to get a c


Really sounds like a vacuum leak. Lean code could still be accurate. Screaming idle usually means air is getting into engine. Ruptured EGR diaphragm would vent air. Brake booster could vent air. A lot of air will show lean mix.

You may have to use different methods to test vacuum. Some use vacuum gauge to test egr and lines which dead end into solenoids. Other tests use water spray or propane gas to draw in and change rpm. You are at a disadvantage if engine does not run.

Crankshaft sensor helps set fuel volume for given rpm. Might not be counting all the rpm's, but would not account for fast idle.

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Did you clean the throttle body and plate of any carbon ?

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Replace the throttle position sensor, this sensor controls idle speed and is most likely faulty.

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1 Answer

My '98 Camry won't stay started. I start it and it just dies not matter how many times I try it. If I leave my foot on the gas it runs but at soon as my foot leaves the gas it dies.


What you have is a bad Idle Air Control ("I.A.C.") valve. This device admist a precise amount of air to keep the engine running at idle. This is a common issue. Get a new one from a dealer, and you will be up and running fine.

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1 Answer

1998 Ford Expedition wont stay running


it is probably the MAFS, the MAFS tells the computer how much air is coming in and if it is bad the ECU will not be able to work properly, it is an integral part of the system,

one way to check the MAFS is to unplug it and try to start the vehicle, if the problem is better then replace the MAFS


Edit: also try to clean the MAFS with brake cleaner, sometimes dirt and oil will cause a MAFS to act up, it may be hard to get to the sensor wires but if you take the MAFS all the way off of the vehicle and just spray the unit down well you should be able to clean any larger debris off of the sensor wire

Oct 02, 2008 | 1998 Ford Expedition

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