Missing and stuttering and stalling when cold
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Missing and stuttering and stalling when cold
1979 f100 302 starts right up, purrs, but misses and stutters and stalls occasionally. Truck does this cold. Doesn’t really get driven enough to warm up. I replaced cap, rotor, wires, plugs, fuel and air filters and no change. Any ideas?
Post Fiend
Joined: Feb 2008
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From: St Albert, Alberta
When was the last time the carb was adjusted and set up ?
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This site’s reply function is weird, sorry if this ends up in the wrong place. The carburetor hasn’t been cleaned or rebuilt since we bought it 5 years ago.
Post Fiend
Joined: Feb 2008
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From: St Albert, Alberta
The Carb may just need to be readjusted/tuned.
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Thank you.
Trailering
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Are you running ethanol-blended fuel? Gasoline carburetors do not like ethanol-blended fuel. I've had them leak and flood 3 days after a complete carburetor rebuild. I changed to straight gas and it was like I got into a different truck. Ran smooth, didn't die, didn't flood out, just by switching to a non ethanol fuel.
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I’ve been messing with automatic choke for days and it’s driving me nuts LOL but it closes cold and opens hot, just not all the way, it’s a hair open cold and a hair closed hot.
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Post Fiend
Joined: Feb 2008
Posts: 5,831
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From: St Albert, Alberta
To set the auto choke just ignore the factory settings. At room temp (approx 72°F) the choke should be just past half-closed. That is where you want it set to..
Fleet Mechanic
Joined: Sep 2014
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From: NE Texas
One thing to check is HOW the choke opens. Does it open more or less gradually? Does it stay almost closed until the engine is almost full temp? (How would you know if as you said you don't drive it till it gets warm?) Your choke could be opening 'way too fast... could look OK when cold but effectively rendering you choke-less within a few seconds. Like 68Flareside said, it's a system.
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