Tapping noise
Thread Starter
Cruising
Joined: Jul 2014
Posts: 12
Likes: 0
Tapping noise
So when I start up first thing in the morning (no matter if its cold or hot out) I am getting a tapping noise that changes with RPM's. When the car gets warmed up, the noise goes away. If the car sits and cools down, it happens again at startup.
The noise goes away after a few minutes. And you can beat on it and it won't make the noise.
It basically sounds like someone taking a bolt and tapping an exhaust pipe. Ive checked the exhaust...no clearance issues or anything loose.
I have a warmed over 350, with a cam, Weiand intake, Edelbrock carb, 3 inch exhaust no cats, full MSD setup.
Any thoughts or advice would be greatly appreciated.
The noise goes away after a few minutes. And you can beat on it and it won't make the noise.
It basically sounds like someone taking a bolt and tapping an exhaust pipe. Ive checked the exhaust...no clearance issues or anything loose.
I have a warmed over 350, with a cam, Weiand intake, Edelbrock carb, 3 inch exhaust no cats, full MSD setup.
Any thoughts or advice would be greatly appreciated.
Thread Starter
Cruising
Joined: Jul 2014
Posts: 12
Likes: 0
Drifting
Joined: Mar 2008
Posts: 1,797
Likes: 422
From: Denver CO
My guess would be rocker or the pressed in rocker stud that has come loose causing the rocker to become loose.Cold, the oil lube has drained off enough to make the tapping sound until oil gets pumped backed up to quiet it down.
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
The symptoms you describe are very classic for a small exhaust leak. Once the system heats up and expands, it seals the leak. Nut and bolt the system while it's cold. The leak is at the manifold-to-head interface or the manifold-to-pipe interface. And by manifold, that means either iron manifolds or headers. I'm not talking a major leak but a tiny one.
Advanced
Joined: Jan 2013
Posts: 65
Likes: 0
From: Kennesaw Georgia
Sounds like a sticky lifter. My truck used to do the same thing. Once the engine warmed up it went away. Hydraulic lifter was sticky. I put in a quart of tranny fluid to clean the system and it helped stop it.
TCT
TCT
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Thread Starter
Cruising
Joined: Jul 2014
Posts: 12
Likes: 0
The symptoms you describe are very classic for a small exhaust leak. Once the system heats up and expands, it seals the leak. Nut and bolt the system while it's cold. The leak is at the manifold-to-head interface or the manifold-to-pipe interface. And by manifold, that means either iron manifolds or headers. I'm not talking a major leak but a tiny one.
Thread Starter
Cruising
Joined: Jul 2014
Posts: 12
Likes: 0
Was also thinking maybe a sticking fuel pump rod where it could be slapping? Seen that in other small block Chevrolets.....
Thanks again for the replies.
