Choke issues
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Choke issues
I have an 86 f250 with a 351 the guy i bought it from made alot of changes to the truck so its a bit of a mess he put an aftermarket Holley carb on it. it has an electric choke on it but the truck originally had a manual choke he had to rig it up so it would work. It partially works but the problem is you adjust it so the it works then the truck starts up no problem but after a few starts the choke moves on its own and the truck doesent start you have to go back in and readjust it.
What should i do to fix this?
What should i do to fix this?
Laughing Gas
Joined: Oct 2010
Posts: 997
Likes: 2
From: Rock Valley, IA
First of all I would check to make sure that your electric source isn't going to one that is on all the time. Then I would check to see if it is getting 12v.
It sounds like the choke is slipping due to vibration. You'll want to make sure the adjustment screws are tight all around.
It sounds like the choke is slipping due to vibration. You'll want to make sure the adjustment screws are tight all around.
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
I have never heard of *any* Ford vehicle of this vintage coming from the factory with a manual choke, it would have come from the factory with an electrically-assisted hot air choke.
In any event, are you saying the adjustments become unadjusted after a short time and need resetting?
Or, are you perhaps describing proper operation... the choke flap closes in cold weather but opens up as the engine warms up.....
In any event, are you saying the adjustments become unadjusted after a short time and need resetting?
Or, are you perhaps describing proper operation... the choke flap closes in cold weather but opens up as the engine warms up.....
Laughing Gas
Joined: Oct 2010
Posts: 997
Likes: 2
From: Rock Valley, IA
When you say unadjusted, what is it exactly that it is doing? Do you have to unscrew the three hold-downs and adjust the choke that way? When you look at the choke before you have to adjust it what does it look like? Open too far? Not open enough?
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
Perhaps the OP means that after trying to start a few times the choke opens enough that it isn't working anymore.
The stock setup was taking 7+/-V from the stator, and if the engine wasn't turning it didn't see any power.
If it's an aftermarket carb with a 12V choke coil then it will be opening any time the key is 'on'.
AFAIK, there was never a manual choke from the factory in this era.
I swapped the choke element from my aftermarket Holley to the original Motorcraft variety and now that it's properly adjusted have no issues.
I has been a mild winter so far here, so I don't really know how well it will work in single digits and below.
The stock setup was taking 7+/-V from the stator, and if the engine wasn't turning it didn't see any power.
If it's an aftermarket carb with a 12V choke coil then it will be opening any time the key is 'on'.
AFAIK, there was never a manual choke from the factory in this era.
I swapped the choke element from my aftermarket Holley to the original Motorcraft variety and now that it's properly adjusted have no issues.
I has been a mild winter so far here, so I don't really know how well it will work in single digits and below.
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