1986 Ford Bronco running bad

Tiny
CONNORS13
  • MEMBER
  • 1986 FORD BRONCO
  • 6 CYL
  • 4WD
  • MANUAL
  • 87,000 MILES
Just bought a 86 ford bronco as a project truck. The guy sold it cheap because it won't pass smog. He has replaced just about all the smog junk inc the carb. Truck ran good and strong just not passing smog inspection. He was told it was the carb. He replaced the carb and now the truck won't stay running. Any tricks to this way small carb on the basic strait six?
Friday, February 5th, 2010 AT 12:14 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Won't pass smog -what is it failing on?
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Friday, February 5th, 2010 AT 12:17 PM
Tiny
CONNORS13
  • MEMBER
  • 2 POSTS
The owner wasn't sure. High reading on co he thinks. Not a lot of info given.
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Friday, February 5th, 2010 AT 12:25 PM
Tiny
RASMATAZ
  • MECHANIC
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High CO carbon monoxide failures indicate an overly rich fuel mixture. On older carbureted engines without electronic feedback controls, look for things like a stuck choke, misadjusted or fuel saturated float or a rich idle mixture adjustment. On newer vehicles with electronic carburetors or fuel injection, the system may not be going into closed loop because of a bad coolant or oxygen sensor.
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Friday, February 5th, 2010 AT 12:30 PM

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