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1986 Ford Thunderbird Rough idle - engine light on at start

Tiny
TALMECH
  • MEMBER
  • 1986 FORD THUNDERBIRD
  • V8
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
1986 5.0L EFI low output (cleveland I think). Engine starts perfectly and revs high for a bit but then settles into its idle. Idle is rough, it wants to stall (it has, very rarely). Rhythmic sound (mmmhhhhmmm..... Mmmhhhhmmmm). Check engine light is on at startup, disappears after a few (2-5) minutes of driving, but the rough idle remains at stoplights etc. Other than idle problems it works great! Oil, oil and air filter and sparkplugs are changed regularely. Thanks guys! What a wonderful site.
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Thursday, September 17th, 2009 AT 7:57 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try pulling code/s out of the computer with and w/o the light on

Check and test the idle speed control motor, throttle position sensor, manifold absolute pressure sensor, and clean out the EGR and PCV valves-
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Friday, September 18th, 2009 AT 4:21 AM

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