Electric Choke, too lean or too rich? - Chevelle Tech
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post #1 of 6 (permalink) Old Feb 19th, 18, 2:46 PM Thread Starter
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Electric Choke, too lean or too rich?

Hey Guys,
I have a Holley 650 DP model 4150. When cold, around 40 degrees, I pump the gas twice and it starts up but it runs rough for about 45 seconds and then the high idle kicks in and it runs smooth. After it warms up, no problems. Just starting. It is a 1970 Chevelle SS with a 454. Question is, is the choke set too rich or too lean? Or is it something else creating the running issues? Thanks
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post #2 of 6 (permalink) Old Feb 19th, 18, 2:58 PM
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Re: Electric Choke, too lean or too rich?

Sounds like it may be a little rich and the choke isnt pulling off enough. Easy enough to pull the air cleaner and have someone start it. The choke should open a little after you start it and rev it just a bit. Manually open the choke with your hand a small amount and see if it smooths out. Lean the choke out a few notches if this helps
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post #3 of 6 (permalink) Old Feb 19th, 18, 3:23 PM Thread Starter
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Re: Electric Choke, too lean or too rich?

I just moved the choke one notch counter clock wise and it seemed to start a little better. Still a little rough. I am going to let it cool down and move another notch. air temp is 42. Thanks
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post #4 of 6 (permalink) Old Feb 19th, 18, 3:27 PM
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Re: Electric Choke, too lean or too rich?

I agree with Gary,as you probably have the choke pulloff set to rich or to lean.It could also be that the fast idle screw is set to slow. I would start it up cold and note how far the choke opens. Experiment with either a little more or little less opening to see what it takes to stabilize your idle. If your happy with the fast idle speed, reset the pulloff, but I would not rotate the cover as this will affect the length of time it takes to fully open the choke.If you simply turn the cover leaner, the choke then comes off too fast and this will give you a hesitation at mid warmup temps.
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post #5 of 6 (permalink) Old Feb 19th, 18, 4:26 PM
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Re: Electric Choke, too lean or too rich?

I also suggest pumping it once to engage the choke.

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post #6 of 6 (permalink) Old Feb 26th, 18, 5:33 PM
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Re: Electric Choke, too lean or too rich?

Quote:
Originally Posted by cyclerider View Post
Hey Guys,
I have a Holley 650 DP model 4150. When cold, around 40 degrees, I pump the gas twice and it starts up but it runs rough for about 45 seconds and then the high idle kicks in and it runs smooth. After it warms up, no problems. Just starting. It is a 1970 Chevelle SS with a 454. Question is, is the choke set too rich or too lean? Or is it something else creating the running issues? Thanks
Quote:
Originally Posted by oldcutlass View Post
I also suggest pumping it once to engage the choke.
I wouldn't give it a full pump at 40F. Half, or 3/4 pump maybe. With less fuel flooding the manifold, it may not run rough.

If it does, you'll be adjusting the pulloff, and maybe the choke coil.

Adjusting Automatic Chokes: A Semi-Universal Approach

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