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Username Post: quadrajet eletric choke adjust        (Topic#363359)
Mad Professor 
Contributor
Posts: 129

Reg: 12-30-08
11-21-20 08:19 AM - Post#2808234    

85 C10 305 H motor.

Choke had stopped working, I wired it open for a while. Elec choke was bad and it's connector too.

Reading up on things I discovered 2nd vac pull off bad too (problems with secondaries opening). I just got all those replaced with OEM GM parts. Soldered in new connector. Elec choke was riveted in, had to go to hardware store for self-tapping #10 screws.....

Question is best way to adjust the elec choke? I've got it set now so choke is barely open cold, and it opens fully after a short while.

It still started kind of hard, had to turn it over a bit and pump the gas. Had been sitting a few days. Will try it again today. I did depress gas pedal and choke was closed......

I'm in New England so cold winters. Should I turn it just a bit so choke is full closed cold?

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package







Edited by Mad Professor on 11-21-20 08:24 AM. Reason for edit: No reason given.

 
Shepherd 
Frequent Contributor
Posts: 2197

Loc: Lake George, NY
Reg: 11-11-15
11-21-20 10:01 AM - Post#2808248    
    In response to Mad Professor

Yes, because as you crank it the vacuum will open it a little, thus reducing the effectiveness for a cold start.



 
YOUNG57 
Frequent Contributor
Posts: 1278

Loc: Tennessee
Reg: 12-06-10
11-22-20 07:26 PM - Post#2808369    
    In response to Mad Professor

I think it is supposed to have about 1/4" gap between the top edge of choke buttterfly and airhorn when cold (ambient temp).



 
Mad Professor 
Contributor
Posts: 129

Reg: 12-30-08
11-23-20 01:00 PM - Post#2808422    
    In response to YOUNG57

That's where it is now, just barely opened.

Seems to start O.K. if not sitting a few days. It has a new fuel filter in it with the check valve so not sure why carb would be dry after sitting.

The old filter the valve stuck closed and truck would not start. Probably due to the crap E10 gas

It also doesn't seem to hold a high idle when cold. I have to fuss with the throttle until it warms up a bit. I need to look into that. If anyone has suggestions on that let me know.

Good things are 4bbl opens up now and when warm the choke opens fully. Choke was staying full shut and choked out the motor.

I'll see how it goes as weather gets colder, might adjust to full closed when cold.

Thanks for replies.

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
85 C10 305, SM465
89 S10 baja package







 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25313
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
11-24-20 04:18 AM - Post#2808475    
    In response to Mad Professor

Clean the throttle linkages. I clean mine with WD40 once a month. The engine must be cold. I don't know if lithium grease on the outer rods would hold up to heat and cold. I adjust the choke on mine twice a year. Once for cold weather. Another for hot weather.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
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