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

dieseling f150

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Old Mar 26, 2008 | 06:48 PM
  #1  
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dieseling f150

hey everyone I have a 86 f150 with a 300ci L6 and it diesels when I cut it off anyone have this happen to them and how did you fix it ?also it idle at about 1500 and the manual says it should be good at about 800.Carb time? Please let me know.TIA Jason
 
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Old Mar 26, 2008 | 10:35 PM
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Get some higher octane gas
 
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Old Mar 26, 2008 | 11:16 PM
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The most common cause of diesel is when the idle speed is too high. Turn the idle speed down, and it shoud fix it.
 
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Old Mar 27, 2008 | 07:54 PM
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Originally Posted by Franklin2
diesel
<< what does diesel mean when your talking bout a gas motor? Running after you shut it off for a second? WHAT?

Taylor
 
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Old Mar 27, 2008 | 08:18 PM
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If its an automatic,leave it in gear when you turn key of.It will kill engine dead.
 
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Old Mar 27, 2008 | 08:38 PM
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Originally Posted by zpmps2
<< what does diesel mean when your talking bout a gas motor? Running after you shut it off for a second? WHAT?

Taylor
When you turn the key off, the engine will keep running really rough for a couple seconds up to maybe a minute.
 
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Old Mar 27, 2008 | 09:09 PM
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I would assume you have a 1 BBL carb?

If so, make sure the 2 nuts holding down the carb body are tight. Double check all your vacuum lines for leakers then check the timing. Then reset the curb idle and the "anti diesel" screw on the lower part of the carb, passenger side.

My experince with "dieseling" has always had some timing/carb adjustment fix.

Good luck,
DEAN
 
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