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#1 |
Registered User
![]() Join Date: Mar 2020
Location: Pdx
Posts: 30
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Rochester carb choke assembly
Hi all,
Working on rebuilding the carb and adding an electric choke. Problem is the picture I took and the paper instructions do not show this rod and plate go. Can’t find a video or anything clear online. Can someone tell me how to re assemble this choke so I can install the electric? Thanks!
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72 Cheyenne Super swb |
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#2 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,628
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Re: Rochester carb choke assembly
Well you know that rod and plate aren’t for the choke!
They’re the accelerator pump arm and rod. |
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#3 |
Registered User
![]() Join Date: Feb 2019
Location: Nor Cal
Posts: 822
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Re: Rochester carb choke assembly
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1968 C20 Fleetside 396 4sp PS PB AC CST . https://www.youtube.com/watch?v=RWK8GgWD4uA |
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#4 |
Registered User
![]() Join Date: Mar 2020
Location: Pdx
Posts: 30
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Re: Rochester carb choke assembly
Face palm moment... thanks!
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72 Cheyenne Super swb |
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#5 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,158
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Re: Rochester carb choke assembly
Welcome Aboard neighbor. You may not need any additional advice but if your interested (I don't even know what style of electric choke you are using) here is a link to my installation. Scroll down to post 590 and there is more on the next page (post 618) about setting the choke up.
Good luck and stay healthy. https://67-72chevytrucks.com/vboard/...98377&page=24o
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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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#6 | |
Registered User
![]() Join Date: Mar 2020
Location: Pdx
Posts: 30
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Re: Rochester carb choke assembly
Quote:
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72 Cheyenne Super swb |
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#7 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,516
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Re: Rochester carb choke assembly
Quote:
I used the "IGN UNFUSED" terminal on the fuse block. If you wanted a fuse in the circuit you could add an in line fuse. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#8 |
Account Suspended
![]() Join Date: Jul 2016
Location: Tacoma, WA
Posts: 6,873
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Re: Rochester carb choke assembly
If you want the choke to work good, run the power wire through an oil pressure switch so it's only heating up when the engine is running. Otherwise it starts heating before its started and if it dies continues to heat.
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#9 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,158
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Re: Rochester carb choke assembly
Glad it was helpful. On mine I used the 12 volt power feed to the T400 kick down. But most trucks don't have that. Doing like LockDoc says would be good.
__________________
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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#10 |
Registered User
![]() Join Date: Mar 2020
Location: Pdx
Posts: 30
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Re: Rochester carb choke assembly
Block sounds like a good choice. I drove the truck and it ran pretty good. I plan on wiring the choke tomorrow along with trying to fine tune it and see what happens.
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72 Cheyenne Super swb |
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#11 |
Registered User
![]() Join Date: Mar 2020
Location: Pdx
Posts: 30
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Re: Rochester carb choke assembly
I’m not getting a high idle at start up. Turning the choke screw isn’t affecting the idle.
This should be touching the high idle cam correct? It’s not really touching, can’t figure out why..
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72 Cheyenne Super swb |
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#12 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,158
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Re: Rochester carb choke assembly
From the photo you posted I am unable to see the fast idle cam. It maybe hidden from view if so it may be upside down. (Easy to do trust me.) See photo for the correct location/orientation of the cam with the choke closed and open. Last picture is one version of cam. There are at least a dozen varieties of them.
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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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#13 |
Registered User
![]() Join Date: Mar 2020
Location: Pdx
Posts: 30
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Re: Rochester carb choke assembly
Yes cam is there just hanging lower. This pic was the only I had and the carb was still half apart.
It seems like my cam follower isn’t touching the fast idle cam.. I’ll mess with it some more today and see what the deal is.
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72 Cheyenne Super swb |
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#14 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,158
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Re: Rochester carb choke assembly
The adjustment screw will not touch the cam when it is in the lower position. (2nd photo) Forgive me if you are already aware of that.
__________________
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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#15 |
Registered User
![]() Join Date: Mar 2020
Location: Pdx
Posts: 30
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Re: Rochester carb choke assembly
Not the screw, the follower that touches the cam is not touching into the step. The black and white instruction you posted. (I have the same)
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72 Cheyenne Super swb |
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#16 |
Registered User
![]() Join Date: Mar 2020
Location: Pdx
Posts: 30
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Re: Rochester carb choke assembly
I’m getting closer.
Choke engaged the truck fired right up idling 1500ish. After letting warm up a little I tapped the gas (old intake choke back on for now) and it went down closer to regular idle. Issue now is if I hit the gas 3rd time it brings the choke back to the middle (2nd step?) position and a higher idle around 1000-1100ish See pictures; first picture is in regular idle choke plate fully open(pushed with finger to get it all the way down) Second picture is after I hit the gas it brings choke back on. Why is me hitting the gas bringing the choke up to what I believe is the 2nd step?
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72 Cheyenne Super swb |
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#17 |
Account Suspended
![]() Join Date: Jul 2016
Location: Tacoma, WA
Posts: 6,873
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Re: Rochester carb choke assembly
The choke assembly when not fully warmed up brings the cam up.
Just because the instructions say so much rpm on the high step doesn't mean you cant refine the adjustment. That adjustment and setting is just a starting point. Your probably on the 2 step more often and for longer periods of time, just adjust the idle down using the same screw while on step 2 of the cam. |
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#18 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,158
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Re: Rochester carb choke assembly
In the second picture the choke stove (new electric unit) is not fully warmed up and so it will cause the choke to be half on. When cold it pulls the choke shut and as the temperature comes up it moves the choke slowly open. It may take 3-5 minutes to get fully opened depending on ambient temperature and the temperature of the engine. If the choke is taking too long to come open then rotating the choke stove (new electric unit) to a leaner position will shorten the time the choke is on. However go to far and the choke may not close completely thus necessitating adjustment of the linkages. Another way to get it to open quicker is to move the sensor (if you have that style) closer to the exhaust crossover in the intake manifold.
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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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#19 | |
Registered User
![]() Join Date: Mar 2020
Location: Pdx
Posts: 30
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Re: Rochester carb choke assembly
Quote:
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72 Cheyenne Super swb |
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#20 | |
Registered User
![]() Join Date: Mar 2020
Location: Pdx
Posts: 30
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Re: Rochester carb choke assembly
Quote:
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72 Cheyenne Super swb |
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#21 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,158
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Re: Rochester carb choke assembly
You're welcome. Glad to hear you have it working.
__________________
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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#22 |
Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: Rochester carb choke assembly
I have seen people mistakenly connect to thew coil on a external coil ignition and wonder why the choke didn't work right. Reason being that the factory coil wire is only about 6 volts. Make sure its hooked up to an ignition fused wire that gets a full 12 volts like LockDoc says.
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"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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