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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

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Old Jun 10, 2009 | 09:32 PM
  #1  
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From: Illernois
Quick question...

When i start my truck and rev it some there is a black smoke that comes from the exaust...

What is this? What can i do to help prevent it? Thanks!
 
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Old Jun 10, 2009 | 09:58 PM
  #2  
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Most likely, it's unburned fuel. I would begin with a tune-up, and make sure
the timing is kosher and that I've got spark to all 8 cylinders. Then, I'd next
move on to the carb.

If you've got EFI, you might ask the computer what it thinks might be up....
 
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Old Jun 10, 2009 | 10:03 PM
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From: Illernois
Well i replaced the plugs not too long ago.

The truck is carbed...and it does need work.

Im actully already taking the truck to get the carb rebuilt tomarrow. So im betting that that takes care of the problem!

Thanks!
 
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Old Jun 10, 2009 | 10:05 PM
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Black smoke is an over rich condition, As for why's and how's.

Kinda hard to say without motor info!

-Enjoy
fh : )_~
 
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Old Jun 10, 2009 | 10:07 PM
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Carb leaking fuel into the intake, causing rich condition at startup.

-Enjoy
fh : )_~
 
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Old Jun 10, 2009 | 10:20 PM
  #6  
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From: Illernois
Gotchya! So im guessing this is why i smell gas when i first start the truck? lol

Thank you
 
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Old Jun 10, 2009 | 10:32 PM
  #7  
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Next time you shut it off, pull the air cleaner and look down the throat of the carb and see if it's dripping fuel, if it is, rebuild or replace.

Usually you can hear a leaking carb when it's running, pull the air cleaner and listen to the flow, it'll sound like it's spitting, not an even sound.

-Enjoy
fh : )_~
 
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Old Jun 10, 2009 | 10:38 PM
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From: Illernois
Ill check that out tomarrow. But i more than likely am getting the carb rebuilt and tuned up tomarrow!

Thanks again yall.
 
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