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10-31-2020, 05:09 PM | #1 |
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Location: Eastern Oregon
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71 350 Divorce Choke Adjust ? QJet
I just can’t seem to get it to close completely. Engine will not start when cold unless I get out and push throttle linkage back and manually push down on the air valve. It then starts up perfectly. Any tips on getting air valve to close completely by pressing accelerator pedal would be great..Jack
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71 C-20 07 Magnum RT AWD |
10-31-2020, 05:51 PM | #2 |
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Re: 71 350 Divorce Choke Adjust ? QJet
You might need to make your linkage rod from the coil to the carb slightly shorter.
Bending it sometimes works. Making a new one will work too. Old clothes hangers work nicely if you need a piece of wire. What do you have for a base gasket between carb and intake? |
10-31-2020, 10:18 PM | #3 |
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Re: 71 350 Divorce Choke Adjust ? QJet
Not to be rude or unkind but are you following the starting procedure?
If so can you post a photo of the passenger side of the carburetor? There are literally dozens and dozens of different choke stoves that were used on GM cars over the years you may not have the correct one. They can go weak and not have enough travel to operate the choke correctly under all conditions. Here is a link to what I did on mine. Scroll to post 618? Now mine has an electric choke and not the choke stove. Where I rotated the electric component you will bend the linkage to get the same effect. If I remember correctly making the linkage shorter will close the choke more. https://67-72chevytrucks.com/vboard/...698377&page=25 Keep us in the loop. And good luck.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
11-01-2020, 01:35 PM | #4 |
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Re: 71 350 Divorce Choke Adjust ? QJet
I think I know how to properly start the truck ? When it’s cold it will never start with just one press of the throttle. If it’s warm it will every time. If I open the air cleaner and push down on the air valve completely while pushing the throttle linkage back, the engine starts right up. I quest I will have to continue playing with the linkage to the heat stove... Jack
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71 C-20 07 Magnum RT AWD |
11-01-2020, 02:26 PM | #5 | |
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Re: 71 350 Divorce Choke Adjust ? QJet
Quote:
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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11-01-2020, 02:45 PM | #6 | |
Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
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Re: 71 350 Divorce Choke Adjust ? QJet
Quote:
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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11-02-2020, 01:49 PM | #7 | |
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Re: 71 350 Divorce Choke Adjust ? QJet
Quote:
One thing you should check is how easy does the linkage the choke stove is operating move. The stove should be closing the choke plate completely once the primary throttle plates are completely open. The stove has no power to overcome any resistance in the linkages.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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11-03-2020, 11:43 AM | #8 |
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Re: 71 350 Divorce Choke Adjust ? QJet
No offense taken at all ! I have the fiber type gasket between the manifold and carb. One pump of the gas pedal does not completely close the air valve. If I manually close it the engine fires right up. Guess I will try to shorten the linkage rod again.
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71 C-20 07 Magnum RT AWD |
11-03-2020, 12:17 PM | #9 |
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Re: 71 350 Divorce Choke Adjust ? QJet
If a shorter rod doesn’t help then look at the choke pull off linkage rod. It might be keeping the plate from closing.
Not absolutely certain on that idea but have a look at it. |
11-03-2020, 04:38 PM | #10 |
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Re: 71 350 Divorce Choke Adjust ? QJet
Today is probably the last warm day for a while so I’m going out to try to adjust the heat stove linkage now. I will update my progress. ..
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71 C-20 07 Magnum RT AWD |
11-04-2020, 11:47 AM | #11 |
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Re: 71 350 Divorce Choke Adjust ? QJet
I tried to adjust the heat stove linkage but noticed that the stepped idle piece is keeping the air valve from closing completely. Suggestions would be great...Jack
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71 C-20 07 Magnum RT AWD |
11-04-2020, 02:52 PM | #12 |
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Re: 71 350 Divorce Choke Adjust ? QJet
Pics of your carb choke side would help.
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11-04-2020, 03:55 PM | #13 |
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Re: 71 350 Divorce Choke Adjust ? QJet
Thanks I will try to get a few loaded today.
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71 C-20 07 Magnum RT AWD |
11-08-2020, 09:42 PM | #14 |
Who's got steelies?
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Re: 71 350 Divorce Choke Adjust ? QJet
You'll need to hold the throttle about 1/4 of the way open so the fast idle screw doesn't interfere with the movement of the fast idle cam while adjusting the choke. There is also a 'choke unloader' mechanism that forces the choke open when the throttle is wide open. I think it acts thru the fast idle cam.
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