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Author
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Topic: Carb quandary
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Dubz
Gearhead Posts: 1718
From: Manitoba Canada
Registered: Oct 2002
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posted 06-28-2003 05:36 PM
   
allright, i got everything hooked up now, intake carb, throttle linkage, the whole 9 yards. However i ran into a snag, when i am sitting in the car and hit the gas (not driving, just idling) it stumbles real bad, like maybe a full second delay until it kicks in and the rpms jump. Would this be a problem with the secondaries coming in too soon, should i just not try to goose it in neutral, or what is my problemThanks for the help again guys/girls
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N266fords
Gearhead Posts: 1404
From: Spokane ,WA USA
Registered: Apr 2003
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posted 06-28-2003 06:48 PM
it could be your accelerater pump is not working right. its job is to supply fuel until the fuel/carb can take over.. if its a dp you could have to much fuel..Bruce
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 06-28-2003 06:53 PM
It either needs bigger squirters, or a different accelerator pump cams. It has a "hole" in the fuel window that causes the bog.
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smgaud
Journeyman Posts: 9
From:
Registered: Jun 2003
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posted 06-29-2003 12:14 AM
What carb is this and what motor do you have?
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Dubz
Gearhead Posts: 1718
From: Manitoba Canada
Registered: Oct 2002
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posted 06-29-2003 03:33 AM
it is a Holley 670 street avenger on a 74 351W with an rpm air gap and a 1" 4 hole carb spacer
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Hemikiller
Gearhead Posts: 606
From: Killingworth, CT
Registered: Feb 2002
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posted 06-29-2003 11:38 AM
You probably need a bigger accelerator pump shooter, try a 31 or 35.Street Avenger, tuned out of the box...yeah right....
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 06-29-2003 03:25 PM
You might try to increase your timing advance a few degrees at a time and see if that helps before blaming it on the carb. If the bog doesn't go away, you might have an early 670 Street Avenger that were found to have an off idle bog problem. If so, you should contact Holley.------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)full street trim!
DanH
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Dubz
Gearhead Posts: 1718
From: Manitoba Canada
Registered: Oct 2002
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posted 06-29-2003 03:39 PM
i just purchased the carb, was it a while ago that the carbs had problems?how would i find out when the carb was built [This message has been edited by Dubz (edited 06-29-2003).]
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Dubz
Gearhead Posts: 1718
From: Manitoba Canada
Registered: Oct 2002
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posted 06-30-2003 05:22 PM
anyone?
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Dubz
Gearhead Posts: 1718
From: Manitoba Canada
Registered: Oct 2002
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posted 07-03-2003 09:34 PM
would bad gas have anything to do with the stumbling??i removed the spark plugs today and they are COVERED with carbon deposits, the engine hasn't been hot in a long time, just and idle here and there in the garage while testing... any other suggestions
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rockafellz
Gearhead Posts: 1426
From: San Lorenzo, CA, USA
Registered: Aug 2001
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posted 07-03-2003 10:38 PM
Wait, wait... this may be something as simple as adjusting the primary accelerator pump. Start the car, open the choke, look into the primaries, tip the throttle rod with your right hand, look for gas to come out of the squirters the INSTANT the throttle is tipped (revved). If no gas comes out, that is your problem (bog, stumble, etc.). Adjust your pump by adjusting the spring loaded nut and bolt.Erik ------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress 1966 Ford Mustang Coupe
Dad's - Original Unrestored
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N266fords
Gearhead Posts: 1404
From: Spokane ,WA USA
Registered: Apr 2003
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posted 07-04-2003 12:15 AM
thats what i said already
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Dubz
Gearhead Posts: 1718
From: Manitoba Canada
Registered: Oct 2002
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posted 07-06-2003 08:19 PM
as soon as i have the slightest pressure on the throttle i get an instant squirt, so it's not that. I pulled the plugs to do a compression check, and the plugs were black with carbon deposits, so it seems that it's rich or the ignition is sucking[This message has been edited by Dubz (edited 07-07-2003).]
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