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2002 Ford Expedition car idles rough

Tiny
TONIORWASH
  • MEMBER
  • 2002 FORD EXPEDITION
Shakes or Wobbles problem
2002 Ford Expedition V8 Two Wheel Drive Automatic 132k miles

my expedition sat in the yard Friday night and all weekend without being driven. On Monday on my way to work the whole ride was rough and at traffic lights and stop sign or even if I let off the gas to slow down the truck would shake and want to turn off. When in park it would idle just fine. Took it to part store and they told me it was the idle air control valve. I replaced that and the same problem occurs. I checked the PVC and it was good. My plugs are good they were replaced begining of the year. Could it be the o2 sensor?
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Tuesday, August 17th, 2010 AT 9:02 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following:

1. Defective spark plug
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
11. Idle air control valve.
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Tuesday, August 17th, 2010 AT 10:46 PM

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