1986 Ford F150 smog

1986 FORD F-150
133,615 MILES • V8 • 4WD • AUTOMATIC
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CEMENT-HEAD
  • MEMBER
  • 2 POSTS
Won't pass idle speed hc
Aug 3, 2009 at 7:39 AM
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DOCFIXIT
  • ✓Experienced Mechanic
  • 18,828 POSTS
Running to rich could be several things. Could you tell time of last tune,any repairs, have you every replaced CAT or O2 sensor. What is compression?
Any miss at idle? ect. anything would help
Aug 3, 2009 at 7:57 AM
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CEMENT-HEAD
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  • 2 POSTS
replaced spark plugs last week. I haven't replaced the sensor but replaced the fuel module 2 weeks ago. Don't know what the cat is. Compression seems to be alright.
Aug 3, 2009 at 9:47 AM
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DOCFIXIT
  • ✓Experienced Mechanic
  • 18,828 POSTS
Catalitic convertor if operating below effeciency level HC will be high. Also leaking injector may want to clean and decarboning throttle body may help.
Aug 4, 2009 at 1:03 AM
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