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> Dual Carb Problem need help
Cazz
post Mar 17 2018, 12:38 PM
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Any carb specialists out there? I need help with a carb problem.
-1974 2.0 with dual weber carbs
-The car is spitting and popping out the carb on cylinders 1&2and also backfiring alittle. I've rebuilt the carbs and pulled this carb off again completely taking it apart and checking with no obvious issues found
-With the car idling when I put my hand over each barrel on this carb there is no suction at all on my hand. The idle doesn't drop at all. Doesn't respond to any adjustments on the fuel/air mixture screws.
-The carb is injecting fuel streams when I open the linkage by hand
-On the carb on the opposite side when I put my hand over each velocity stack it really pulls air really hard on my hand and the car will bog down and shut off as it should.
-I have new intake gaskets an new carb base gaskets installed. I sprayed carb cleaner around the base of the carb and also at the head with no change in idle. Any ideas? Is this car basically running on 2 cylinders?
-On the opposite carb on cylinders
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rhodyguy
post Mar 18 2018, 09:53 AM
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Does the engine smooth out, or at least run better, at 3k rpm? If so, the FIRST thing I would suspect are the idle jets. Closing the idle air adj screws one at a time should produce a marked stumble. No change, pull the jet on that throat. The o-rings, metal ring caps and springs must be in place. Did you replace the fuel filter before you installed the rebuilt carbs? The streams you see are the pump jets. Nothing to do with the idle circuits.
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Posts in this topic
Cazz   Dual Carb Problem need help   Mar 17 2018, 12:38 PM
MarkV   Sounds like they are way out of sync. Find a good ...   Mar 17 2018, 02:45 PM
porschetub   Sounds like they are way out of sync. Find a good...   Mar 17 2018, 03:03 PM
Perry Kiehl   Sounds like you may have ignition problems as well...   Mar 17 2018, 03:49 PM
jcambo7   Put you're carbs at the initial adjustment sta...   Mar 17 2018, 07:19 PM
98101   Cazz mentioned a lack of suction on one side. I se...   Mar 18 2018, 02:54 AM
jcambo7   Cazz mentioned a lack of suction on one side. I s...   Mar 18 2018, 08:41 PM
rhodyguy   Does the engine smooth out, or at least run better...   Mar 18 2018, 09:53 AM
Elliot Cannon   Does the engine smooth out, or at least run bette...   Mar 18 2018, 05:42 PM
wndsrfr   Any carb specialists out there? I need help with ...   Mar 18 2018, 02:15 PM
SirAndy   Valve adjustment if there's no vacuum.... :a...   Mar 20 2018, 08:48 PM
PatrickB   Any carb specialists out there? I need help with...   Mar 22 2018, 03:44 AM
r_towle   Check your firing order. You may have flipped the ...   Mar 18 2018, 06:51 PM
McMark   Get the CSP Bellcrank linkage from CIP1. This vid...   Mar 19 2018, 08:15 AM
Mblizzard   I suspect an issue related to the "rebuild. ...   Mar 19 2018, 12:07 PM
barefoot   I'm having sync problems as well Dell 40's...   Mar 20 2018, 06:27 PM
98101   I'm having sync problems as well Dell 40...   Mar 20 2018, 08:13 PM
98101   Sorry for a newbie question... this is how I learn...   Mar 20 2018, 08:41 PM
r_towle   Sorry for a newbie question... this is how I lear...   Mar 20 2018, 09:19 PM
98101   Sorry for a newbie question... this is how I lea...   Mar 21 2018, 12:47 AM
r_towle   Carbs are stupid simple. They allow air into the e...   Mar 20 2018, 09:21 PM
porschetub   Carbs are stupid simple. They allow air into the ...   Mar 22 2018, 12:00 AM
stugray   Carbs are stupid simple. They allow air into the...   Mar 22 2018, 01:07 PM
McMark   Also the suction in one cylinder is created by the...   Mar 21 2018, 10:23 AM
BfloRandy   Any carb specialists out there? I need help with ...   Mar 22 2018, 06:26 AM


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