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Oct 18, 2014 | 04:55 PM

ls1blackc5

Thread Starter

Cruising

Joined: May 2014

Posts: 10

Likes: 0

Please help!!

Just did lt headers and full exhaust and now this tapping sound is happening. I didnt have the valve covers off and it didnt have any problems beford the swap. I was very careful when pulling the intake off to make sure nothing fell down the ports. What the hell could this be?

Oh and i pulled the fuel pump fuse abd disconnected the spark plugs to turn it over and didnt hear anything. Please help guys.

Video http://youtu.be/6RqafY7fFug

Oct 18, 2014 | 06:52 PM

c31980

Racer

Joined: Nov 2007

Posts: 318

Likes: 3

From: kuwait

exhaust leak or lose spark plug..rechek all .gasket collector.any lose bolt

Oct 19, 2014 | 12:03 AM

cudamax

Burning Brakes

Joined: Mar 2013

Posts: 1,131

Likes: 5

From: Illinois/Wisconsin Line

Is this your video?

Oct 19, 2014 | 10:44 PM

XotiK ZO6

Burning Brakes

Joined: Sep 2004

Posts: 1,003

Likes: 1

From: Richmond VA

Definitely an exhaust leak. I didn't see your air pump tubes or connections. Make sure those are connects or sealed off.

The camera moves pretty quickly so details are hard to pick up.

Hope that helps.

Oct 20, 2014 | 12:02 AM

cudamax

Burning Brakes

Joined: Mar 2013

Posts: 1,131

Likes: 5

From: Illinois/Wisconsin Line

Sounds like a knock to me. Not an exhaust leak

Oct 20, 2014 | 07:56 AM

vettenuts

Team Owner

Joined: Mar 1999

Posts: 22,025

Likes: 192

From: At the beach in little Rhody

Quote:

Originally Posted by cudamax

Sounds like a knock to me. Not an exhaust leak

Me too. OP, did you rotate the motor by hand at all or with the starter? Sometimes doing that will collapse the lifters and they will take several minutes to pump back up.

I would run it some more and see if it goes away. While running, feel around for escaping exhaust.

Oct 20, 2014 | 08:09 AM

cudamax

Burning Brakes

Joined: Mar 2013

Posts: 1,131

Likes: 5

From: Illinois/Wisconsin Line

Yea thats a lifter. You pulled the intake?

Oct 20, 2014 | 06:38 PM

2003RedVette

Racer

Joined: Mar 2014

Posts: 410

Likes: 3

From: Garland Texas

I have attached a link of what mine sounded like with a loose spark plug. I'm sure you have already checked this but the sound is similar, just a little higher pitched than yours. Good luck!