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#1 |
Registered User
Join Date: Jun 2010
Location: Denham Springs, La.
Posts: 257
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Bad idle problem
Truck is a 70 Chevy with a built 350 in it. Replaced intake, put in brand new distributor, carb is an Edelbrock 1406/1407 (hafta double check) manual choke. If it sits without being started for 4-5 days, you have to pour a little gas into the carb, once it starts it will star perfect, and idle fine. Drop it into reverse/drive and it acts like you unplugged 7 spark plug wires. Plugs are new, wires came on it. Once in gear it has no balls at all. New inline fuel filter, no filter in side of carb. You can also smell it burning alot of gas when its just sitting there idling. I cant find any vacuum leaks at all, but havent check the line to the transmission valve yet...
Any ideas or pointer? Thanks, Tony
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05 QSM GTO - M6, Corsa, King Springs 70 SWB CST - 350/Auto, Foose 18/17 I upset whiners too.... |
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#2 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,218
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Re: Bad idle problem
Sounds like the carb is running rich & getting soot on the plugs. Does the choke go off all way when you push in the cable? Do you push the cable in after it starts? Pull out a plug or 2 & see if they are carboned up. If the choke isv OK you may have a carb. problem
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#3 |
Registered User
Join Date: Jun 2010
Location: Denham Springs, La.
Posts: 257
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Re: Bad idle problem
I've tried adjusting the air/fuel mixture but even turning them both all the way in changes nothing. Doesn't even make it die. I'm thinking the carb is junk but wanted other ideas.
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05 QSM GTO - M6, Corsa, King Springs 70 SWB CST - 350/Auto, Foose 18/17 I upset whiners too.... |
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#4 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,218
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Re: Bad idle problem
I wouldn't call it junk but it probably needs a kit & freshening up.
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#5 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Bad idle problem
what type fuel pump?
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#6 |
Registered User
Join Date: Jun 2010
Location: Denham Springs, La.
Posts: 257
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Re: Bad idle problem
Fuel pump looks to be a stocker, and not very old. Havent checked the in tank filter yet. Tank is barely full now so this would be the best time probably.
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05 QSM GTO - M6, Corsa, King Springs 70 SWB CST - 350/Auto, Foose 18/17 I upset whiners too.... |
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#7 |
Registered User
Join Date: Jan 2012
Location: Glencoe Alabama
Posts: 510
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Re: Bad idle problem
I'm sure you checked the timing.
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72 Cheyenne super 10 08 3500 HD 4dr dually 12 ford flex (wifes ride) 76 Monte Carlo 83 Chevy short wide Silverado 96 Mazda Miata, 2000 Allegro Bus |
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#8 |
Registered User
Join Date: Jun 2010
Location: Denham Springs, La.
Posts: 257
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Re: Bad idle problem
Yeah timing is good also. Starts on the first hit.
Posted via Mobile Device
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05 QSM GTO - M6, Corsa, King Springs 70 SWB CST - 350/Auto, Foose 18/17 I upset whiners too.... |
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#9 |
Registered User
Join Date: May 2012
Location: Raleigh, NC
Posts: 639
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Re: Bad idle problem
Sounds like the carb to me also. Rebuild it or buy a new one!
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#10 |
Rottenwood Garage Member
Join Date: May 2009
Location: Marietta Ga
Posts: 74
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Re: Bad idle problem
I have owned a few vehicles with these carbs.
They are very sensitive to trash in the fuel bowl and high fuel pressure. Both conditions cause the symptoms you are describing. When you are experiencing the rough idle, look into the venturis and see if there is fuel dripping - if there is the first thing I would suspect would be for a stuck float valve or 2. The nice thing is that this is a really easy problem to fix: pull the carb off and clean it out with a bit of carb cleaner and you're good to go. 30 minutes tops, and usually no new gaskets required. Good luck, Todd |
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#11 | ||||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Bad idle problem
Quote:
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A Holley! Gary
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#12 |
Registered User
![]() Join Date: May 2012
Location: Anton, Texas
Posts: 2,364
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Re: Bad idle problem
hatred: did you just replace the intake, did it run ok before you replaced the intake...or has it always run like this.....more info if ya can...
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#13 | |
Registered User
Join Date: Jun 2010
Location: Denham Springs, La.
Posts: 257
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Re: Bad idle problem
Quote:
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05 QSM GTO - M6, Corsa, King Springs 70 SWB CST - 350/Auto, Foose 18/17 I upset whiners too.... |
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#14 |
Registered User
Join Date: Jun 2010
Location: Denham Springs, La.
Posts: 257
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Re: Bad idle problem
Bump...
Might try to find a local carb to borrow this weekend. See how that goes...
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05 QSM GTO - M6, Corsa, King Springs 70 SWB CST - 350/Auto, Foose 18/17 I upset whiners too.... |
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