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

1986 F150 interesting problem

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Old Dec 20, 2025 | 05:59 PM
  #16  
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KULTULZ
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From: W (BY GOD) V
SEE IF THIS HELPS -

The Ford TFI Ignition system Bible (tech article) - Auto Electrics - OzFalcon - Ford Falcon Owners Club

- IMO -

One needs the correct year WSM (and period TSB's) to more easily use diagnostic routines to find the problem(s).
 
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Old Dec 20, 2025 | 09:11 PM
  #17  
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On your 1986 F-150 5.0L EFI, the SPOUT connector (Spark Output) is a small, usually gray, jumper plug found near the distributor, often within 6 inches, connected to the TFI module on the distributor itself; disconnecting it lets you set base timing by turning off computer control, usually to about 10 degrees BTDC.

See if disconnecting the spout connector makes any difference.
Jim
 
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Old Dec 21, 2025 | 03:25 PM
  #18  
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FWIW, here's the sprout connector. Yellow wires.

 
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