Cracked Manifold
Thread Starter
Racer
Joined: Aug 2005
Posts: 385
Likes: 0
From: Apopka Florida
Cracked Manifold
I have huge exhuast leak from a cracked manifold on the passenger side of my 96 LT4. Has anyone else cracked these cast manifolds? It seems as if it would require some major heat to do this, but somehow I managed to do it under daily driving. It has always had a very, very small leak but recently has gotten very loud and annoying rather quickly. Any ideas?
Also, I am throwing a SES light. The light will stay on for two or three trips, 1/2 a day or so, probably 2-3hours of driving, and then will shut off for an equal amount of time before randomly coming back on. I recently installed a 52mm TB, and am thinking the TPS sensor should be adjusted but It idles the same as before. I figured that if the idle hadn't changed, the senor didn't need to be adjusted, again any ideas?
Also, I am throwing a SES light. The light will stay on for two or three trips, 1/2 a day or so, probably 2-3hours of driving, and then will shut off for an equal amount of time before randomly coming back on. I recently installed a 52mm TB, and am thinking the TPS sensor should be adjusted but It idles the same as before. I figured that if the idle hadn't changed, the senor didn't need to be adjusted, again any ideas?
Last edited by 96Eric; Jan 17, 2006 at 03:28 PM.
Thread Starter
Racer
Joined: Aug 2005
Posts: 385
Likes: 0
From: Apopka Florida
Im currently shopping for a set of headers to replace the manifolds, so when I get those installed I will post a pic, but the crack is currently residing underneath the cover around the manifold. The exhaust manifolds have never been off the car to my knowledge.
Le Mans Master
Joined: Jul 1999
Posts: 8,683
Likes: 6
From: Phoenix AZ
I'd take a look at EM headers as well, shoot forum member Perfusion a PM, he put EM longtubes on his otherwise stock LT4 and got some great results...and I believe he has a dyno sheet for them as well! 
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
The #3 tube on my TPIS header developed a crack a while back. Gave me a Lean SES code.
Fortunately it was at the very top of the tube, right as it begins to turn down at the cylinder head.
I used a hand held torch and welding rod to weld it up. So far so good.
Jake
Fortunately it was at the very top of the tube, right as it begins to turn down at the cylinder head.
I used a hand held torch and welding rod to weld it up. So far so good.
Jake
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Thread Starter
Racer
Joined: Aug 2005
Posts: 385
Likes: 0
From: Apopka Florida
Originally Posted by JAKE
The #3 tube on my TPIS header developed a crack a while back. Gave me a Lean SES code.
Fortunately it was at the very top of the tube, right as it begins to turn down at the cylinder head.
I used a hand held torch and welding rod to weld it up. So far so good.
Jake
Fortunately it was at the very top of the tube, right as it begins to turn down at the cylinder head.
I used a hand held torch and welding rod to weld it up. So far so good.
Jake
Heel & Toe
Joined: Aug 2005
Posts: 15
Likes: 0
"Stainless Works" group purchase - still time left!!
“Stainless Works” offers long tube headers for the 92-96 LT1 Corvettes in two different configurations. The headers with 3.000” off-road lead-pipes, part number “C492-96” retail for $943.95. The headers with the 2.500” lead-pipes & high-flow cats, part number “C492-96CAT” retail for $1258.95. They both have 1.625” primary tubes and are made entirely of 304-stainless steel. There is still time left to take advantage of the “group purchase” special offer; $50.00 off of the retail pricing plus free ground shipping anywhere within the continental U.S. This special offer is only good through the end of January 2006. Send us an e-mail at info@stainlessworks.net for further details.
Thanks,
Scott
Stainless Works
Thanks,
Scott
Stainless Works
Racer
Joined: Jul 2000
Posts: 262
Likes: 0
From: Frisco, Texas USA
Originally Posted by Zix
I'd take a look at EM headers as well, shoot forum member Perfusion a PM, he put EM longtubes on his otherwise stock LT4 and got some great results...and I believe he has a dyno sheet for them as well!
Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
You can show my car as one that cracked a passenger side manifold-OEM.
This happened toward the finish of the OLOA in 2004. Figured I had just lost a gasket which is disheartening as one big reason to stay with the OEM manifolds was reliability!
I replaced the exhaust gaskets twice including the donut with no luck...still the ticking...loud ticking too. Finally I yanked the manifold and removed the heat shields...huge cracks at the end cylinders were present!
I took images, but unfortunately I no longer have them...they were impressive. From Chris May, a new manifold OEM was only about 120 bucks.
I will be installing headers in the future.
This happened toward the finish of the OLOA in 2004. Figured I had just lost a gasket which is disheartening as one big reason to stay with the OEM manifolds was reliability!
I replaced the exhaust gaskets twice including the donut with no luck...still the ticking...loud ticking too. Finally I yanked the manifold and removed the heat shields...huge cracks at the end cylinders were present!
I took images, but unfortunately I no longer have them...they were impressive. From Chris May, a new manifold OEM was only about 120 bucks.
I will be installing headers in the future.