(800) 853-2651
SHOP NOW

O/T But, 1986 F150 302 Fuel Injected

K

Ken-in-Ky

Member
This has been a subject before, sometimes when I slow down ,the engine quits , other times it will act as if no fuel and chugs along trying rapidly to change gears ,local mechanics either dont know or don't know how to fix the problem The fuel cap has been replaced , If I release the pressure ? in the tank by loosing the cap it will restart until it decides to repeat the process , Could there be a sensor on the fuel supply which regulates the fuel supply according to load and speed ,BTW It changes gear (auto) hard with a real clunk (in any gear) seems maybe some correlation between hard gear changes and fuel requirement under normal driving conditions ,The timing chain broke on one occasion and I think caused by kick back from these hard gear changes.Does anyone have any similar problem with these models.?.
 
Trouble codes????

FIRST thing I'd suspect would be the throttle position sensor (TPS).

MAP sensor commonly fails, as well.

Is there pressure or vacuum in the tank? If a high vacuum, there's a problem in the charcoal cannister area.
 
the first thing i would do would be to pull the Idle Air Controll Valve off and clean the holes in it with some carb cleaner, if you don't know ehre this is just ask,this should help your idling and sould help with your off idle stumbe

those holes get carboned up not allowing air to pass through, and making the plunger stick, USALLY when you take it off it doesn't ruin the gasket, if it does just get the kid's ceral box and make another one.
 
If it's pulling a vacuum on the fuel tank, the vapor cannister or tubing is plugged. The fuel cap on a gas vehicle is not vented for vapor emissions control.
 
I second the throttle position sensor especially for the hard transmission shifts. My BIL had that happen on his 1995 where the transmission shifted real harsh and replacing the TPS corrected that. You can check it out with an Ohm meter and it is fairly easy to replace.
 
I also thought of the TPS/hard shift link, but I don;t believe the 'ol 85 has a 'puter-controlled tranny.
 
You must log in or register to reply here.
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top