Help!!! Me
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Freshman User
Joined: Sep 2004
Posts: 38
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From: Nelson B.C
Help!!! Me
My 86 f-150 doesnt like to start when its warm, like soo bad the it wont start, if it sits for an hour its fine, and im stumped. i dont know if this helps but it burns alot of oil, any imput would be great
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
Just a shot in the dark...
It Could be the o2 sensors are gunked up and it's running rich cause of the burning oil, causing a flooded like condition.
Changing the o2 sensors wouldn't help much until the oil burning is fixed.
Could also be the coolant temp sensor is bad and the truck thinks that it's cold and richens the fuel mixture, causing a flooding effect.
Have you checked the computer codes?
It Could be the o2 sensors are gunked up and it's running rich cause of the burning oil, causing a flooded like condition.
Changing the o2 sensors wouldn't help much until the oil burning is fixed.
Could also be the coolant temp sensor is bad and the truck thinks that it's cold and richens the fuel mixture, causing a flooding effect.
Have you checked the computer codes?
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
You might be able to just unplug it. Then the computer should go into open loop mode, and run fuel mixture at a predetermined factory set level. should get you by until you can repair the engine.
Since you are not getting any computer codes it could also be vapor locking when hot. When the engine is hot, and you shut off the engine the engine temp increases, vaporizing the fuel, so you cannot start it. When the engine cools off it condences the fuel and you are able to start the truck again.
Since you are not getting any computer codes it could also be vapor locking when hot. When the engine is hot, and you shut off the engine the engine temp increases, vaporizing the fuel, so you cannot start it. When the engine cools off it condences the fuel and you are able to start the truck again.
Elder User
Joined: Oct 2004
Posts: 984
Likes: 0
From: Winnipeg, Manitoba
Easy test for vapour lock. Twist the gas cap loose a bit(should hear a hiss). Leave the cap loose, and try starting the truck. If it starts, it's definitely vapour locking. Extremes in temperatures often cause this condition, and it can be an indication that the fuel pump is on it's way out. Should at least get it pressure checked in the near future. The pressure check will verify if it's the pump or not. It could also be a plugged tank vent causing the issue, which is a bit easier and a lot cheaper to fix.
