86 F150 Stalling
Thread Starter
|
New User
Joined: Dec 2010
Posts: 4
Likes: 0
86 F150 Stalling
I have an 86 F150 with the ford 300 inline 6. It has been sitting for about 4 years. I had it started up with a new battery. I Changed the spark plugs, wires, cap, and rotor. It ran great until part way down the cam gear broke. I replaced it and lined the 2 dots up on the gears for the timing. Right now it will start to sputter when it's warm and sputters and dies in drive and reverse. I think one problem I may be having is a missing vacuum hose, I dont know how to read the diagram for the vacuum hosing unfortunately. 
I tried to inclued a picture. There's a metal tube to the bottom left, has spots for 3 hoses. The tube thats missing a hose is towards the front and pointing slightly down. Thanks for any help.
Thread Starter
|
New User
Joined: Dec 2010
Posts: 4
Likes: 0
I usually start it up without the cap then cap it. It seems to start easier that way and it'll idle high until I cap it or it warms up. Heres another view of it and the vacuum diagram. If anybody knows another good place to start with this stalling problem the helps
Moderator
Joined: Jan 2001
Posts: 57,027
Likes: 2,763
From: Virginia
The fitting with the open port is the "INT MAN" in your diagram. This is source for intake manifold vacuum.
On the diagram, one line that goes up from "INT MAN" goes to a tee fitting. In the diagram, one line runs to the left that goes to A/CL BI-MET. This is the temperature sensor in the aircleaner, so that line will run to the aircleaner. The line going up and to the right goes to P/D MTR. I don't know what a P/D MTR is to tell you the truth. Some else may know.
The lower line leading to the left goes down to a tee, and then down to the MAP sensor. This is the manifold absolute pressure sensor, and is not needed now since you are not using the computer. On the other leg of the tee the line goes down and around and then up to the V CK V and the to the TAD and TAB solenoids. You do not need this line either, since it feeds solenoids that where controlled by the computer.
On the diagram, one line that goes up from "INT MAN" goes to a tee fitting. In the diagram, one line runs to the left that goes to A/CL BI-MET. This is the temperature sensor in the aircleaner, so that line will run to the aircleaner. The line going up and to the right goes to P/D MTR. I don't know what a P/D MTR is to tell you the truth. Some else may know.
The lower line leading to the left goes down to a tee, and then down to the MAP sensor. This is the manifold absolute pressure sensor, and is not needed now since you are not using the computer. On the other leg of the tee the line goes down and around and then up to the V CK V and the to the TAD and TAB solenoids. You do not need this line either, since it feeds solenoids that where controlled by the computer.
Thread Starter
|
New User
Joined: Dec 2010
Posts: 4
Likes: 0
Ok, so from what i gather I dont need that line hooked up. It seems to effect my idle really bad. i had to unplug it to start it one time. More importantly it still begins idling pourly when warm and stalls when in gear. Any ideas what I can start checking. It did run well before the timing gear on the cam broke and before that it sat for 4 years.
Trending Topics
Moderator
Joined: Jan 2001
Posts: 57,027
Likes: 2,763
From: Virginia
If letting air into the engine makes it run better, it's running too rich. Check to make sure the choke door on top of the carb is fully open when it's warmed up. If it's partially shut, that will cause it to run rich. Also, you can mess with the mixture adjustments on the carb if there are any. Most of the time the factory covers them over.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / Worst Features Of The 2025+ Ford Expedition
Brett Foote
10 Ways Ford is LOSING to the Competition
Joe Kucinski
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
Lead Driver
Joined: Jul 2009
Posts: 6,477
Likes: 19
From: Sheffield, AL
1984-1986 4.9L engines have the "feedback" carburetor. The carburetor and timing are controlled by the computor. If all of the original emmission controls are not in working order, the computor locks the timing and makes the carburetor go rich.
Thread
Thread Starter
Forum
Replies
Last Post
irish12671
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
0
Nov 8, 2015 04:35 PM
brettofamerica
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
5
May 1, 2015 06:10 PM
CMax1981
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
13
Oct 24, 2014 05:45 AM
Stingychimp
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
8
Oct 4, 2014 04:12 PM
