| warm up time question [message #208581] |
Wed, 22 May 2013 17:44  |
chasingsummer
Messages: 434
Registered: May 2011
Location: asheboro, nc
Karma: 0
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Senior Member |
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I have a camping weekend coming, so in route I would like to verify my choke goes completely off. By this I mean the secondary interlock on the top of the carb, I would like to see it not holding back my secondaries.
I am seeking ideas on how long I need t be running for this to happen?
Is it as soon as when the carb has to be kicked down after warm up, which mean I should be able to see happen while warming up and airing up.
once warmed up, does the engine have to be running for me to see this "unlatched"
thansk
bgk
brian
asheboro, nc
75 eleganza, 74 build
119k miles and counting,
DOG HOUSE
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| Re: [GMCnet] warm up time question [message #208592 is a reply to message #208581] |
Wed, 22 May 2013 19:18  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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It is more a factor of when the choke reaches wide open position. The
secondary plate in the top of the quadrajet will not open ever if the choke
is not properly set. When the engine is stone cold, loosen the three choke
heat thermostat screws and after the throttle plate is moved to set the
choke, adjust the housing until the choke plate just reaches the closed
position. Tighten the three screws. Start engine and observe the choke
plate. It should open fully.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On May 22, 2013 3:44 PM, "brian" <chasingsummer@triad.rr.com> wrote:
>
>
> I have a camping weekend coming, so in route I would like to verify my
> choke goes completely off. By this I mean the secondary interlock on the
> top of the carb, I would like to see it not holding back my secondaries.
>
> I am seeking ideas on how long I need t be running for this to happen?
> Is it as soon as when the carb has to be kicked down after warm up, which
> mean I should be able to see happen while warming up and airing up.
>
> once warmed up, does the engine have to be running for me to see this
> "unlatched"
> thansk
> bgk
> --
> brian
> asheboro, nc
> 75 eleganza 2 74 build
> 118k miles and counting,
> DOG HOUSE
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: warm up time question [message #208639 is a reply to message #208581] |
Thu, 23 May 2013 13:07 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Answer- it depends. It depends how cold it is out and if you have any block off plates. I'd say just before your coolant temp reads normal it should be wide open. Also the fast idle kick down cam is in several steps and the fast idle cam weight needs to be fully down. Then and only then is idle speed controled by the idle speed screw, not the fast idle screw. At this point the choke plate should be full vertical and the secondary air valve lock out retracted.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] warm up time question [message #208641 is a reply to message #208639] |
Thu, 23 May 2013 13:41 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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You need to make sure all the external linkages are free of dirt and oil so
the linkages operate freely.
On Thu, May 23, 2013 at 11:07 AM, John R. Lebetski <gransport@aol.com>wrote:
>
>
> Answer- it depends. It depends how cold it is out and if you have any
> block off plates. I'd say just before your coolant temp reads normal it
> should be wide open. Also the fast idle kick down cam is in several steps
> and the fast idle cam weight needs to be fully down. Then and only then is
> idle speed controled by the idle speed screw, not the fast idle screw. At
> this point the choke plate should be full vertical and the secondary air
> valve lock out retracted.
> --
> John Lebetski
> Chicago, IL
> 77 Eleganza II
> Source America First
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
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1-800-752-7502
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| Re: warm up time question [message #208699 is a reply to message #208581] |
Fri, 24 May 2013 07:35 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| chasingsummer wrote on Wed, 22 May 2013 18:44 |
I have a camping weekend coming, so in route I would like to verify my choke goes completely off. By this I mean the secondary interlock on the top of the carb, I would like to see it not holding back my secondaries.
I am seeking ideas on how long I need t be running for this to happen?
Is it as soon as when the carb has to be kicked down after warm up, which mean I should be able to see happen while warming up and airing up.
once warmed up, does the engine have to be running for me to see this "unlatched"
thansk
bgk
|
Brian,
You actually asked a bunch of stacked questions, and you have gotten a equal number of correct answers, but they are not so clear as I think you may need, So I will try to sort them out and give answers that will at least get you in the correct direction.
First - I am assuming that you have the OE exhaust heated choke, but the time to open should not be very different.
The time to a fully open choke given moderate (shirt sleeve) conditions should be less than one minute.
And, it may not be as soon as you can get the idle down to the 600 range, but it should be real close.
No, the engine need not be running for you to see the choke open the the secondaries come to open with the primaries. If it is already warn when you open the air filter, this is how things should be. It will take a while for things to cool enough for the choke to start closing again.
When starting a cold engine with a conventional automotive carburetor, the standard practice is to cycle the throttle at least once (aka stomp on it). This does two things first and foremost, it allows the choke mechanism to set for a cold start. It also takes advantage of the included acceleration pump to "prime" the engine enough fuel for it to light without too much cranking.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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