i hear air
Thread Starter
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Freshman User
Joined: Apr 2004
Posts: 30
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i hear air
Hello again i may look like i dont know anything. i put in a new intake manifold and now i hear air in the carb. is that normal? for some reason i dont think it is. Thanks for the replys
Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
Sounds like you have a leak. But to ruel out simple things first, make sure you reconnected al vacuum hoses first. Your carb could have vacuum connections that need to be hooked up or capped off.
Now, if it's not just an open connection, you need to look for leaks at the intake manifold. It could be leaking where the carb mounts. This can usually be fixed by pulling the carb, cleaning the surfaces and replacing the gasket. Torque the carb bolts to spec. (I'm guessing about 20ft-lbs).
Now, if you determine the leak is between the intake and the head., you've probably got to remove the intake and reinstall it being very particular about the gasket positions and using gasket sealer in a few key spots.
How is it running? Any stumbling, missing or high-idling?
Now, if it's not just an open connection, you need to look for leaks at the intake manifold. It could be leaking where the carb mounts. This can usually be fixed by pulling the carb, cleaning the surfaces and replacing the gasket. Torque the carb bolts to spec. (I'm guessing about 20ft-lbs).
Now, if you determine the leak is between the intake and the head., you've probably got to remove the intake and reinstall it being very particular about the gasket positions and using gasket sealer in a few key spots.
How is it running? Any stumbling, missing or high-idling?
Thread Starter
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Freshman User
Joined: Apr 2004
Posts: 30
Likes: 0
air leak
Ok i only have one hose goin to the carb. the fitting has been cleaned and is in good condition. now the leak may be from the intake area. but is hard to figure out. the truck is a 67. so all the parts are fairly easy to figure out. the air sounds like it is comming out the carb it self. i have replaced the gasket 2 times already. yes it stumbles a bit a pop here or there when gettin in the throttle. and a lack of power too. thanks for the help.
Last edited by trkdrvr; Jan 18, 2005 at 10:57 AM.
Cargo Master
Joined: Sep 2004
Posts: 2,691
Likes: 6
What does it sound like? After I rebuilt my carb it whistled real loud. It sounded like a slipping belt. It turned out that the old carb-to-manifold gasket had been siliconed on around the bolts and I didn't clean off the silicone well enough so that the new gasket could seal. It was so loud I couldn't tell where the sound was coming from so what I did was take a spray bottle and spray water all around the carb until I found the spot. When the water hit the spot it got sucked in and the sound stopped and the engine slowed down a little. I had to get a sharp chisel and get all of that silicone off. Then I took a wire brush and polished the mounting surface until it was shiny. Air leak solved.
