1986 Ford F-150 Trouble codes

Tiny
STIMY
  • MEMBER
  • 1986 FORD F-150
Electrical problem
1986 Ford F150 V8 Four Wheel Drive Automatic

I have a few trouble codes I need explained to me. 13, 34, 19, 53, 81, 85 and 95
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Friday, March 12th, 2010 AT 9:16 PM

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Tiny
CJ MEDEVAC
  • EXPERT
See my profile. I am not a cyber vehicle kind of guy, CJs are my cup of tea.

I did have a 1986 T-Bird w/ big problems. Bad idle and cut off.

Computer spit out codes, and I replaced parts, lots of $ spent. No one knew the answer. Even mechanics.

IF YOU HAVE MONKEYED WITH YOUR IDLE SCREWS---YOU HAVE MADE THINGS WORSE.

COMPUTER BASES ALL, ON BASE IDLE (T-BIRD BASE IDLE IS 400 RPM), LEARNED THIS THE HARD WAY

I CAN TALK YOU THRU THE PROCEDURE OF PUTTING IT BACK, AS LONG AS IT WILL IDLE DECENTLY

I replaced some sensors 2-3 times. Weeks passed and I got nowhere.

Was told that alot of the time, replace 1st sensor on code list, the rest will go away. Autozone and Advance Auto really helped me to understand each SENSOR and its FUNCTION.

Turns out my THROTTLE BODY INJECTORS WERE BAD, something that in 1986 was computer controlled, but not computer recognised for failure.

$5---$5---$5---$5---$5 was what I spent at a self-serve salvage yard, to finally fix it ! ! ! ! !

Lack of regulated fuel made other sensors feed wild info to the computer.

As for codes, I have code manuals I bought specifically for that repair. This is what I got as far, as meaning. May can search book for definitions for the sensors, if you want me to.

My 2 cent comments are in ( ), except in the 2nd "34"

CODE

13cannot control RPM during low RPM test (like mine)

34exaust pressure high defective PFE/ EPT sensor (sounds like stopped up catylitic converter---does it lack power big-time, at higher engine RPM?)

34defective PFE/ EPT (1.9 L CFI, 2.9 L, and 3.0 L)

19failure in EEC reference voltage

53TP sesor circuit open, above maximum voltage

81air management 2 circuit failure

85canister purge circuit failure

95?---Not in book, however, lists 94/96 deals with THERMACTOR AIR SYSTEM INOPERATIVE

I can try to give more help, I am limited in this field.

Send me any break-thrus

Love, Turddog
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Saturday, March 13th, 2010 AT 12:59 AM

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