Dual Carb Problem need help |
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Dual Carb Problem need help |
Cazz |
Mar 17 2018, 12:38 PM
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#1
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Newbie Group: Members Posts: 13 Joined: 22-December 16 From: NC Member No.: 20,688 Region Association: None |
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 |
rhodyguy |
Mar 18 2018, 09:53 AM
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#2
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,192 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
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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