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06-09-2019, 03:27 PM
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#1 |
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Senior Member
 
Join Date: Oct 2012
Location: Lexington, Ky
Posts: 2,147
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Starting problem
350 with quadrajet, starts fine when cold.
After warming up, turn it off and it cranks fine, but doesn't want to fire. Extremely strong smell of gas. Is the choke getting out of adjustment again (had choke problem a while back and adjusted it) ?? Appreciate ideas on what to look for or check.
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Larry 84 Chevy SWB, "Roy", dark blue OG paint, 5.7 LS1, 4L60, Vintage Air, 96k miles. "It's a sorry man who can't find his wife a good job" |
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06-09-2019, 03:44 PM
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#2 |
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Registered User
Join Date: Apr 2011
Location: Fairview Park, Ohio
Posts: 1,031
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Re: Starting problem
Does the choke fully open when the engine is warmed up? If not adjust it so it does.
There the first thing to check Also check position of the choke when you try to restart it and smell the gas.
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My build page http://67-72chevytrucks.com/vboard/s...d.php?t=764662 My cabinet building site http://www.cbcabinets.com Last edited by rockyrivermark; 06-09-2019 at 04:55 PM. |
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06-09-2019, 04:28 PM
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#3 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,676
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Re: Starting problem
How's you mileage? Could be leaking well plugs. What year was the carburetor made?
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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06-09-2019, 05:44 PM
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#4 |
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Registered User
Join Date: Nov 2017
Location: Leeds west yorkshire
Posts: 307
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Re: Starting problem
Is your choke working? Do you get high idle when cold then when warm does idle drop to low idle position ( approx 600/700 rpm)?
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06-09-2019, 08:52 PM
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#5 |
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Senior Member
Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,859
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Re: Starting problem
I had a problem similar to that, and in addition I noticed black water blowing out of the tail pipes during cold starts. It turned out the choke pull-off was bad. It is also called a vacuum brake. You can test it with a mityvac tool, to make sure the diaphragm pulls the attached linkage.
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06-10-2019, 01:11 AM
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#6 |
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Registered User
Join Date: Jun 2013
Location: Somewhere
Posts: 3,123
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Re: Starting problem
Others asked, but is the choke open when warm? It should be. Take the air cleaner top off and look.
If so, crank the engine (try to start) with the gas to the floor. This often starts a flooded engine (too much gas in it). |
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06-10-2019, 01:07 PM
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#7 |
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Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,229
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Re: Starting problem
You probably have a leaking needle & seat. After you shut the engine off pull the air cleaner & look down the throat of the carb. If you can see gas dripping in the throat it is getting by the needle & seat. Also make sure the choke is open like the guys have said.
George |
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06-10-2019, 04:10 PM
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#8 |
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Senior Member
Join Date: Oct 2012
Location: Lexington, Ky
Posts: 2,147
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Re: Starting problem
I warmed it up today, and yes the choke is about half closed.
Adjusted it and it seems to be good now. Starts right up when warm. I will be testing more tomorrow to make sure. Thank you to all who posted ! This is a great site with great members.
__________________
Larry 84 Chevy SWB, "Roy", dark blue OG paint, 5.7 LS1, 4L60, Vintage Air, 96k miles. "It's a sorry man who can't find his wife a good job" |
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