Re: electric choke
[Re: B1MAXX]
#3179575
09/30/23 01:41 PM
09/30/23 01:41 PM
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Joined: Jan 2003
Posts: 25,785 Rio Linda, CA
John_Kunkel
Too Many Posts
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Posts: 25,785
Rio Linda, CA
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And be aware that if you turn on the ignition switch for a time before starting the motor, the internal heater will be on and will make the choke pull off sooner.
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Re: electric choke
[Re: ackpht]
#3179610
09/30/23 03:33 PM
09/30/23 03:33 PM
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Joined: Mar 2005
Posts: 2,060 Pendleton NY
terzmo
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Choke pull-off is usually a matter of minutes, not seconds. A simple adjustment of the choke affects how long the choke stays on. Best way to see it is to check a YouTube video. https://www.youtube.com/watch?v=0H5IBSFgYJE Saw that before..did it and no matter where I set the butterfly it opens within seconds. IF I adjust the butterfly so it is closed,( just closed barely as the instructions say) the engine smokes and stutters until the choke opens up a bit. If I leave the butterfly an 1/8 inch or so open..the motor starts and the choke works for about 15 seconds and then the car stalls. ( butterfly now almost completely open)Restart and it's like a cold motor with no choke and unless RPM's are kept up, it will stall.
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Re: electric choke
[Re: stumpy]
#3179629
09/30/23 04:48 PM
09/30/23 04:48 PM
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Joined: Jan 2003
Posts: 25,785 Rio Linda, CA
John_Kunkel
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Posts: 25,785
Rio Linda, CA
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The choke pull off is inside the electric choke.
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Re: electric choke
[Re: stumpy]
#3179644
09/30/23 05:24 PM
09/30/23 05:24 PM
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Joined: Sep 2003
Posts: 3,096 Morgan Hill, CA
ackpht
master
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master
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Posts: 3,096
Morgan Hill, CA
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I'm no expert but I've just been through this myself, so it means I haven't forgotten it yet. I assume that when the engine is warm and the choke is full open, it starts and idles OK- idle speed is set, idle mixture screws are set. The video below includes a few more details like setting the initial choke position and working with the fast idle screw. I'd say check it out before you replace anything because it's possible you just have the choke set way too lean because you're trying to hold the choke butterfly open a little when it's cold using the choke spring itself. Rich/lean tuning adjustments to the choke housing then affect how long it takes the butterfly to open, but it always starts closed when cold. https://www.holley.com/blog/post/how_to_adjust_the_choke_and_fast_idle_on_holley_carburetors/
Last edited by ackpht; 09/30/23 05:28 PM.
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Re: electric choke
[Re: ackpht]
#3179675
09/30/23 07:56 PM
09/30/23 07:56 PM
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Joined: Mar 2005
Posts: 2,060 Pendleton NY
terzmo
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I'm no expert but I've just been through this myself, so it means I haven't forgotten it yet. I assume that when the engine is warm and the choke is full open, it starts and idles OK- idle speed is set, idle mixture screws are set. The video below includes a few more details like setting the initial choke position and working with the fast idle screw. I'd say check it out before you replace anything because it's possible you just have the choke set way too lean because you're trying to hold the choke butterfly open a little when it's cold using the choke spring itself. Rich/lean tuning adjustments to the choke housing then affect how long it takes the butterfly to open, but it always starts closed when cold. https://www.holley.com/blog/post/how_to_adjust_the_choke_and_fast_idle_on_holley_carburetors/Thanks but I went through that many times and if I slightly close the butterfly as described, the car sputters and runs rough for seconds until the butterfly opens a bit. fast idle is not an issue. IF and I say IF...The choke would work fine for me if it would stay longer where I get it to start..idle nicely..then stalls because the butterfly opens so fast. I set the butterfly about 1/16 to 1/8 open. Car starts and runs well until the butterfly goes full open in about 15 seconds.I am considering converting to a manual choke or get used to a slow getta way when cold starting. Now if there was a way to slow the butterfly from opening, that would be great. Thanks to all for the suggestions
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Re: electric choke
[Re: ackpht]
#3179786
10/01/23 06:43 AM
10/01/23 06:43 AM
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Joined: Mar 2005
Posts: 2,060 Pendleton NY
terzmo
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Exactly how are you setting the initial position of the choke butterfly? By rotating the choke housing? Exactly as shown in video and the same as I have done for 57 years
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Re: electric choke
[Re: B1MAXX]
#3179850
10/01/23 11:58 AM
10/01/23 11:58 AM
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Joined: Mar 2005
Posts: 2,060 Pendleton NY
terzmo
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The choke is opening to quick after start up (based on read the post) that's the housing adjust. A stuck piston will will run very rough from beginning the slowly clean up as the choke opens. "A stuck piston will will run very rough from beginning the slowly clean up as the choke opens. [/quote]" That's exactly what happens if I set the choke butterfly just up to the housing, like instructions/video. If I leave a 1/16 gap with the butterfly and housing it starts..runs at a high idle and stalls when butterfly opens completely in less than 30 seconds. As the engine starts to clean up at cold start, the butterfly opens at the same time and a few seconds after the engine is "cleaned" up the car will stall (in park) because of loss of rpm. If I juice it when running, it will run but if letting off the throttle, it will stall until reasonably warmed up. This is a new carb..bought last Sept and had this issue since day 1. Thanks again to all for the input
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Re: electric choke
[Re: B1MAXX]
#3180092
10/01/23 10:42 PM
10/01/23 10:42 PM
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Joined: Jun 2014
Posts: 1,321 VA
dragon slayer
pro stock
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pro stock
Joined: Jun 2014
Posts: 1,321
VA
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The choke is opening to quick after start up (based on read the post) that's the housing adjust. A stuck piston will will run very rough from beginning the slowly clean up as the choke opens. Yes but I don't think that is the issue fully Based on his statements. If he close the blade by richening the choke thermostat (more spring pressure on choke blade) his car doesn't like to start and sputters when it does. Either too rich, or pulloff not operating to slightly open choke blade. I would check the piston, check fast idle speed and effect on choke.
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Re: electric choke
[Re: dragon slayer]
#3180109
10/01/23 11:26 PM
10/01/23 11:26 PM
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Joined: Jan 2003
Posts: 10,555 Freeport IL USA
poorboy
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Posts: 10,555
Freeport IL USA
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It sounds to me like the choke setting is not done when the throttle is set on the fast idle cam. There may also not be a functioning choke pull off, or it is not opening the choke blade as much as it is suppose to. It also sounds like the fast idle speed screw may not be adjusted correctly.
It sounds to me like nearly all the adjustments are incorrect.
With the motor off and still cold, open the throttle about 1/2 way, and manually close the choke blade. This should lift the fast idle cam up so that when the throttle is released, the fast idle screw should be on the 2nd highest step (some are the highest step) of the fast idle cam. If it is not doing that, the rod to the fast idle cam needs to be adjusted so it is correct. There is a designed fast idle speed the fast idle screw is suppose to be set at (read the carb's directions).
With the throttle on the fast idle step, and the choke blade manually closed, the choke housing is rotated so there is enough tension on the choke blade to hold it closed. On a very cold motor, that tension could be pretty strong. There should be markings on the choke housing that rotates that identifies the "normal" choke tension setting, plus marks for a more lean choke or a more rich choke setting. Start with the setting at the normal position. Generally chokes function best below 60 outside degrees. All the choke adjustments have to be made on a cold motor. You can not properly adjust the choke if it is not cold, it will nearly always be set too lean and will open too fast
The Choke pull off should open the choke against the housing spring pressure about 3/16" to 1/4" (there is a drill bit index number for this setting between the choke blade and the top of the air horn. That adjustment is a starting point and the clearance is achieved by bending the linkage to the choke pull off). if it opens too much, the choke is too lean. If it doesn't open enough, the choke is too rich. Properly set, the motor should not run rich nor lean. The choke pull off has to be made while the motor is cold (if the choke pull off is vacuum operated, the pull off clearance can be done with a vacuum pump before the motor is even started). Once the motor warms up, the choke pull off adjustment has to wait for at least 8-10 hours.
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