Cold Idle Issue
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Mountain Pass
Joined: May 2020
Posts: 111
Likes: 3
From: Tempe
Cold Idle Issue
Alright guys here's my issue. Went to start my truck this morning, gave the gas pedal one tap to set the idle, started it, and realized it was definitely too high. So I tapped the gas pedal again to try and bring it down and it shot up even higher and stayed there. I recently dialed in my warm idle where I wanted it so I obviously must have adjusted this one too much. Will turning the cold screw CCW bring down my initial cold start idle? Or turning it clockwise? Stupid question but I have totally confused myself at this point. It is the 300 inline 6
Thread Starter
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Mountain Pass
Joined: May 2020
Posts: 111
Likes: 3
From: Tempe
Its the Carter 1 barrel. I thought so too but that didn't seem to do it. Maybe I haven't backed it out enough but it almost seems like its not even engaging the fast idle cam.
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Back up a little bit and first make sure of simple stuff, with the engine off, make sure the pedal linkage to the carburetor isn't binding. When the accelerator pedal is floored the carburetor butterflies should be perfectly vertical. Make sure it moves freely in both directions. Then maybe disconnect the linkage and make sure the butterfly itself moves freely without sticking or binding and hanging up on something.
Thread Starter
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Mountain Pass
Joined: May 2020
Posts: 111
Likes: 3
From: Tempe
Back up a little bit and first make sure of simple stuff, with the engine off, make sure the pedal linkage to the carburetor isn't binding. When the accelerator pedal is floored the carburetor butterflies should be perfectly vertical. Make sure it moves freely in both directions. Then maybe disconnect the linkage and make sure the butterfly itself moves freely without sticking or binding and hanging up on something.
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
How cold is "cold" where you are at? What kind of temps we talkin'?
What I'm getting at is if you were driving it yesterday and shut it down and there was some internal icing built up internal to the carb there can be some strangeness on startup too. That's some WAG there.
What I'm getting at is if you were driving it yesterday and shut it down and there was some internal icing built up internal to the carb there can be some strangeness on startup too. That's some WAG there.
Thread Starter
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Mountain Pass
Joined: May 2020
Posts: 111
Likes: 3
From: Tempe
How cold is "cold" where you are at? What kind of temps we talkin'?
What I'm getting at is if you were driving it yesterday and shut it down and there was some internal icing built up internal to the carb there can be some strangeness on startup too. That's some WAG there.
What I'm getting at is if you were driving it yesterday and shut it down and there was some internal icing built up internal to the carb there can be some strangeness on startup too. That's some WAG there.
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Thread Starter
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Mountain Pass
Joined: May 2020
Posts: 111
Likes: 3
From: Tempe
Because I'm an idiot. haha I was actually trying to lower the cold idle but couldn't get it to work, and when I backed the screw in I went a little far. But after getting home from work yesterday and being able to dive into it, The choke is so far out of adjustment that when I set it with tapping the pedal, it completely skips over all the gears, hence the very high idle. And since I haven't touched that before, I am giving myself a pass. So for now I have just backed the screw out to the point it isn't engaged and problem solved. I only have to feather the gas for 10-15 seconds then she starts idling on her own.
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