Question about 1999 Ford Expedition

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My 99 Expedition it act like it want to cut off while I'm drivivg

I can be at 60mph time i get ready to go up a hill my truck **** i have too pat the gas pedel too the floor and it stop stalling ( service engine soon ) light is on I replace air filter,pcv vale I'm not for sure if I need a tune up or fuel filter / I had a friend test it with a hand held tester it said something about the air flow I didn't understand that also when it stalls and I hold the pedel to the floor it make a popping sound like a back fire can someone please help me

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  • Anonymous Jan 01, 2009

    Is there a start control sensor on a 1999 Ford Expedition . Sometimes it will noy start as it seems not to be geting fuel.



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If u are getting a fault code saying it is the air flow sensor u need to replace it a reset the computer memory

the airflow sensor is between the throtle body and the the filter

once u have done that road test truck and check codes again

let me know how u went

Posted on Dec 21, 2008


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2 Answers

My '98 expedition acts like its cutting out when

Sounds like it could be a weak fuel pump.Check your fuel pressure it should be 30-45 psi.

Feb 17, 2012 | 1998 Ford Expedition

1 Answer


The anti theft light will flash fast on the dash if it's activated. You simply lock & unlock the doors to disarm it.

Check your inertia switch to see if it is activated. Press the rest button. Se owner manual to rest.

The control functions are contained in the instrument cluster. This module carries out all of the PATS functions such as receiving the identification code from the encoded ignition key and controlling engine enable. The instrument cluster initiates the key interrogation sequence when the vehicle ignition switch is turned to RUN or START.
The PATS uses the PCM to enable or disable the engine. The instrument cluster communicates with the PCM over the SCP network in order to enable engine operation. The instrument cluster and the PCM use sophisticated messages in order to prevent a theft. The instrument cluster and the PCM share security data (when first installed together) that makes them a matched pair. After this security data sharing, these modules will not function in other vehicles. The shared PCM ID is remembered even if the battery is disconnected. The instrument cluster also stores the vehicle's key identification code even if the battery is disconnected. There are special diagnostic procedures outlined in this workshop manual that may be carried out if either a new instrument cluster or PCM needs to be installed.
All elements of PATS must be functional before the engine is allowed to start. If any of the components are not working correctly, the vehicle will not start.
PATS uses a visual theft indicator. This indicator will prove out for three seconds when the ignition switch is turned to RUN or START under normal operation. If there is a PATS problem, this indicator will either flash rapidly or glow steadily (for more than three seconds) when the ignition switch is turned to RUN or START. PATS also "blips" the theft indicator every two seconds at ignition OFF to act as a visual theft deterrent.
The PATS is not compatible with aftermarket remote start systems, which allow the vehicle to be started from outside the vehicle. These systems may reduce the vehicle security level, and also may cause no-start issues. Remote start systems must be removed before investigation of PATS-related no-start issues.
Visual Inspection Chart Mechanical Electrical
  • Ignition lock cylinder
  • Encoded ignition key (PATS key)
  • Use of non-encoded ignition key (key without the molded plastic head, non-PATS key)
  • Use of a non-programmed encoded ignition key
  • Central junction box (CJB) Fuses:
    • Fuse 2 (5A)
    • Fuse 6 (5A)
    • Fuse 30 (30A)
  • PATS transceiver
  • Connectors
  • Ignition switch

Oct 25, 2011 | 1999 Ford Expedition

1 Answer

Acts like it is not getting enough fuel when going up hills. have replaced fuel filter but still having trouble. 2000 Ford Expedition 5.4l engine

Fuel is controlled by the O2 Sensors
Where they replaced at 100,000 miles?

Check fuel pressure on engine fuel rail,
with a gauge

Clean MAF Sensor

Check/Test TPS Sensor

Aug 05, 2011 | 2000 Ford Expedition

1 Answer

After driving for about an hour...then if you go up a hill or steep grade it acts like it is going to die. As long as you are on level ground it is fine..only happens driving up hill. The car will go...

you may have a bad catalytic converter, because when the exhaust system get hot it melts and constrict the exhaust flow . bring your car to a muffler shop and have them check the exhaust system pressure. they normally do this for free.

Aug 22, 2010 | Cadillac DeVille Cars & Trucks

1 Answer

98 expedition shaking at 40 to 60 mph.

You might want to check your tires and make sure they dont have a broken belt in one of them!!

Dec 10, 2008 | 1998 Ford Expedition

3 Answers


the spark unit is shorting out to system ground. remove the spark unit and look carefully at where it is mounted and look for small cracks in the electrical insulation material that was poured into it at the spark unit factory. if water gets into this area, havoc occurs.

May 19, 2008 | 1999 Chevrolet S-10 Pickup

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