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#1 |
Registered User
Join Date: Aug 2010
Location: San Antonio TX
Posts: 15
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after new carb, cannot get idle down without stalling [Solved]
Hello everyone,
I am working on rebuilding a 1971 C-10 with my dad. We recently put on a new Quadrajet Carb and replaced the points, condenser, coil, and distributor. (here is a link to my post on that): http://67-72chevytrucks.com/vboard/s....php?p=4123824 Now, the truck turns over beautifully, but we had to set the idle to around 6000rpm! We set the points with a dwell meter, but when I try to back off the idle, it stalls out. I tried adjusting the idle mixture with the screws in the front of the carb, but that didn't have any appreciable change. Any ideas on what we could do to get it down to a normal idle? Thanks Last edited by colbyclay; 01-04-2011 at 02:14 PM. Reason: added details, changed RPMs. |
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#2 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: after new carb, cannot get idle down without stalling
could b a vaccume leak
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#3 |
Registered User
Join Date: Aug 2010
Location: San Antonio TX
Posts: 15
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Re: after new carb, cannot get idle down without stalling
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#4 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: after new carb, cannot get idle down without stalling
You need to spray WD 40 around the base of the carb and along the intake to see if there is a leak, you will get a change in rpm if there is. As far as idle rpm I don't know what engine you have but 600 is normal for the auto and 700 for the manual trans. on a V8.
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69 Chevy 4x4 383 Power ![]() |
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#5 | |
Registered User
Join Date: Aug 2010
Location: San Antonio TX
Posts: 15
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Re: after new carb, cannot get idle down without stalling
Quote:
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#6 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: after new carb, cannot get idle down without stalling
Your tach is messed up because a stock engine won't run to 6000 continuously. If it is running that fast you have the throttle stuck open.
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#7 |
Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: after new carb, cannot get idle down without stalling
600 rpm sounds low to me.
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#8 |
Registered User
Join Date: Jun 2009
Location: Arlington Texas
Posts: 602
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Re: after new carb, cannot get idle down without stalling
If it were me I would take the new carb back and get it replaced with another. I have seen several threads on here where the new rebuilt quadrajet was junk.
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1970 GMC truck ![]() 1988 Harley 1200 Sportster ![]() |
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#9 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,220
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Re: after new carb, cannot get idle down without stalling
Make sure the intake manifold, carb base, & gasket all match. There are variations in those years & if it all doesn't line up you have a horrible vacuum leak.
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#10 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,220
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Re: after new carb, cannot get idle down without stalling
There is a large opening in the rear of the carb for power brake vacuum outlet. If you are not useing it put a 1/4 in. pipe plug in it.
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#11 |
Registered User
Join Date: Jul 2009
Location: blacksburg,s.c.
Posts: 155
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Re: after new carb, cannot get idle down without stalling
Ok let me see if i can follow what you did to this truck, it was running as per other posting, gas was leaking so you bought new carb, then with new carb it backfired and then you started replacing parts,eg...point, dist, cond, etc,,,,,am i close to correct? if so then your problem was the base gasket didnt match the manifold , which caused all your problems, now you will have to start over, pull carb off and match your gaskets to the carb and manifold, then you can go back to troubleshooting one item at a time.hope this helps.
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#12 |
Registered User
Join Date: Aug 2010
Location: San Antonio TX
Posts: 15
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Re: after new carb, cannot get idle down without stalling
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