Question about 1998 Ford Expedition

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Bad Computer is it possible to change a computer on a 98 ford expedition on your own if so how

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  • big_bob_bear Apr 22, 2009

    I have a 98 expedition and when I went to get the emissions done it said that the computer was not ready. I drove for a month and put about 2k miles to try and cycle it but nothing changed.

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You should be able to perform that task without much difficulty. The PCM is located beneath the dash on the passenger side behind and above the kick panel. You'll have to remove the battery and tray to access the PCM connector harness. There will be a small bolt running through the connector attaching it to the PCM that you'll have to remove. Once that's remove you can unclip the PCM from the inside and pull it out from under the dash. If you are replacing it, you'll have to take note of the calibration number on the sticker on the driver's door or door jamb. This number is required to program,or flash the new PCM. Hope this helps.

Posted on Dec 09, 2008

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2 Answers

I have a 98 ford expodtion lost the key and tor into the ignion plz help.


OK. So you lost your key. People do that all the time. That's what spare keys are for. But you apparently don't have a spare. So you tore into the ignition to try to get the vehicle to start. Now you are realizing that the vehicle has safeguards to prevent just that from happening (we call what you tried to do "hot wiring"). The reason that the car is designed that way is to prevent theft and therefore reduce insurance costs. Money saved in order to have a spare key.

So you made some stup1d mistakes.

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And now you want help. Unfortunately, you can't fix stup1d.
Call the dealer, get it towed, have it repaired, get a new key AND a spare. And after you spend that $1000.00, consider it a lesson learned.

Oct 31, 2015 | Ford Cars & Trucks

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Sounds like your multifunction control switch needs replaced. Its location is on your steering colum.

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Feb 14, 2015 | 1999 Ford Expedition

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Why won't my 98 expedition crank after changing the battery?


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Sep 02, 2014 | 1998 Ford Expedition

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you have a bad sensor check all sensors starting with air. berrydalewolf

Oct 26, 2009 | 1998 Ford Expedition

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Check engine light flashes on 99 Ford Expedition, hooked it up to computer and says plug # 3 is bad, I replaced it but the light is still on


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Sep 10, 2009 | 1999 Ford Expedition

1 Answer

1998 Ford Expedition won't start after changeing ignition.


Yes. You have to take the car to a ford dealer and have the new key programmed. This should solve your problem. Good luck.

Jun 29, 2009 | 1998 Ford Expedition

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I have a code po354 on my 99 expedition, book says cylinder d misfire, which cylinder is this?


I just worked on 98 expedition 5.4l had code PO354. This code refer to an open primary coil winding, open wire, or bad PCM.
Check primary winding with ohm meter should be from 0.5 to 1.5 ohms and about 2.5 ohms with a hot engine. check wiring with a noid light, run the engine and shake the harness if light goes out repair harness you should have battery voltage with key on the computer controls the ground side.

Jun 22, 2009 | 1998 Ford Expedition

1 Answer

98 expedition computer problem


then you have a bad thermostat and the computer cant pass the test when it doesnt reach operating temp it cant go in to closed loop where it burns the fuel more efficient

Apr 22, 2009 | 1998 Ford Expedition

1 Answer

My 98 ford expedition will run for 4minutes and kill and wont start for a few hours a mechani changed my fuel pump and filter but its doing the same thing, then he said it could be my coils or my computer...


I CAN tell you that its probably not your coils packs. Possibly yoyur computer if you haven't gotten it fixed yet. But if you have I would like to know what it might have been.


R/
Brian
brian_brackett2004@yahoo.com

Dec 08, 2008 | 1998 Ford Expedition

1 Answer

98 ford Exped. oil and engine light come on but go off on restart


did you check the transmission heat sensor or the intake air sensor these can be incorporated with temp guage on some vehicles

but theres also the problem of alternator is getting ready to give only
take an electro meter and hook up to cigarette lighter with a 2 post power maker and watch the voltage as your driving try to recreate the conditions that brought this about if the reading changes dramatically this will tell your alternator will need to be replaced at some point also dead cells in battery creates this little bump in electrical

Nov 20, 2008 | 1998 Ford Expedition

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