New carb problems.

• Jul 23, 2011

• #1

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Mikesok246

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I just finished hooking up a new Holley carb on my 318 with new Holley intake manifold. It starts fine, but the idle sounds a little high. adjusting the idle screw doesn;t seem to effect the idle speed. i have backed out the screw and i elieve i hear a small backfire every now and then, and after shutting off the car most recently there was a gust of air out of the carb. This is my first time working with carbs and i would greatly appreciate any help.

-Mike

 

• Jul 23, 2011

• #2

1badgtx

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sounds like a vacum leak...With the motor runnin spray some carb cleaner around werer the intake is bolted on...Al;so spray around the carb were it,s bolted to the manifold..If you have a leak then the rpms will go up and that is were your problem is...Also check to make sure all vacum lines are hooked up...
Petty Blue 67 gTx

 

• Jul 23, 2011

• #3

70rr-brian

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What kind of choke is on it and is it functioning properly?

 

• Jul 23, 2011

• #4

70rr-brian

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Also, check the rear butterfly to make sure it isn't opened slightly. There is an adjustment screw I think for those.

 

• Jul 23, 2011

• #5

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Mikesok246

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Thank you for the help! Turns out the throttle return spring that i used off the old 2bbl was too weak and couldn't close the throttle all the way. The car runs nicely now, thanks again.

-Mike.