1982 Ford F-150 Rough Idle When Warm

1982 FORD F-150
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HONDA400
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Hi,

I just purchased a 1982 Ford f150 inline 6 (300), with AT. When the truck gets up to operating tempurature it starts to have a rough idle, and at times may stall out. Prior to reaching operating tempurature the truck idles great and never stalls.

Any ideas as to where I should start?

Thank you,

Eric
Mar 26, 2006 at 6:16 AM
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PEPPERMRJ
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Any maintenece history? Might just be in need of a tune up. Plgs, wires, cap, rotor, etc.
Fuel injection or carbeurated?

Good luck and :) post back.
Mar 26, 2006 at 8:01 AM
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HONDA400
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thank you for your reply...

It does have a carb, and I do not know the maint. history.

Thanks, Eric
Mar 26, 2006 at 8:39 AM
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PEPPERMRJ
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Six cylinders have a way of shaking the carb loose. Check it out. Do a tune up also. Plugs, wires, cap, rotor, PCV valve, fuel filter, and a tank of gas with intake/carb/injector cleaner. I like chevron with techron or seafoam.

Good luck and let us know. :)
Mar 26, 2006 at 10:31 AM
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HONDA400
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Thanks, I'll try that and let you know!

Eric
Mar 26, 2006 at 11:00 AM
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PEPPERMRJ
  • ✓Experienced Mechanic
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Forgot to mention that the carb can come loose at the mounting bolts and the bolts/screws that actually hold the carb together. Check and tighten both as needed.
Mar 26, 2006 at 11:07 AM
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LOVESCARS
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Could be choke adjustment as well check adjustment after you done what peppermj has suggested above.
Mar 26, 2006 at 12:10 PM
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Suggested Repair

Check and tighten the carburetor mounting bolts and the screws that hold the carburetor together, since inline-six vibration can loosen them. Perform a tune-up including plugs, wires, cap, rotor, PCV valve, and fuel filter, and run a tank of fuel with carburetor cleaner such as Chevron with Techron or Seafoam. After that, check and adjust the choke.

Conversation Summary

A 1982 Ford F-150 with a carbureted 300 inline-six and automatic transmission idles well when cold but runs rough and may stall once it reaches operating temperature. Maintenance history is unknown. Experts recommend checking for a carburetor loosened by engine vibration, completing a basic tune-up with plugs, wires, cap, rotor, PCV valve, fuel filter, and fuel-system cleaner, then checking choke adjustment.

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