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Help with exhaust install.

Herd Thinners

By Herd Thinners
in Troubleshooting & Recalls

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Herd Thinners Enthusiast

Herd Thinners

Posted
Posted

I installed a Corsa exhaust on my 2015 GMC Sierra I have a few questions maybe someone can shed some light on.

 

1. The bracket holding the end of the exhaust (flex section) to the cat has exhaust coming from the side where the bracket meets. I installed and reinstalled twice with the same results. Any ideas. Is this normal.

 

2. The truck seems to hesitate when leaving from a stop but if I get on it no hesitation. Any ideas.

 

3. On initial start up condestion was coming from every connection area but that has stopped. Any insight.

 

Thank you.

chuckl1218 Senior Enthusiast

chuckl1218

Posted
Posted

1. Make sure the head pipe flex section is seated as far forward as possible with the band clamp secured around the joint where flex part meets the 3rd cat. Also make sure the pipe support hanger is level. I had to twist the head pipe so that the hanger was level and everything else aligned properly and so that the head pipe did not hit the frame.

 

2. I don't know about this. Maybe due to the exhaust leak described in 1?

 

3. I had the same condensation. Tried loosening band clamps, verified proper installation of pipe joints and re-tightened / re-torqued. Still had condensation. So I called Corsa. Tech support guy was very friendly and helpful. He said this is normal and would go away after driving for a while. He also said to make sure all band clamps were properly torqued and that the clamp bolt was 90 degrees offset from the slit in the flange at each joint. He said the band clamps help seal the joints as the system is heated and settles in. And if you loosen the band clamps, increase by 5-10 ft lbs when re-torquing. I re-torqued mine and after a few days and a 3 hour highway trip, my condensation issues went away.

 

If you have any more issues, I recommend calling Corsa tech support. They are very helpful. I hope this helps you!

I installed a Corsa exhaust on my 2015 GMC Sierra I have a few questions maybe someone can shed some light on.

1. The bracket holding the end of the exhaust (flex section) to the cat has exhaust coming from the side where the bracket meets. I installed and reinstalled twice with the same results. Any ideas. Is this normal.

2. The truck seems to hesitate when leaving from a stop but if I get on it no hesitation. Any ideas.

3. On initial start up condestion was coming from every connection area but that has stopped. Any insight.

Thank you.

Herd Thinners Enthusiast

Herd Thinners

Posted
  • Author
Posted

Extremely helpful. ill loosen the two clamps and reinstall. Any idea what size bolt is in the main backet near the cat. Mine is a tad beat up and I wanted to replace it now.

 

I'll let you know how it turns out.

chuckl1218 Senior Enthusiast

chuckl1218

Posted
Posted

Extremely helpful. ill loosen the two clamps and reinstall. Any idea what size bolt is in the main backet near the cat. Mine is a tad beat up and I wanted to replace it now.

I'll let you know how it turns out.

No, I don't know the bolt size just that it takes a 13mm socket and the others are 15mm. Someone on the forum said the band is easy and not expensive to replace. It is common and most auto parts stores or muffler shops carry them.
Herd Thinners Enthusiast

Herd Thinners

Posted
  • Author
Posted

Great info. So when I removed my exhaust I took the hangers off. The hanger closest to the cat has angle to it and was facing the back of the truck. I removed it and flipped it facing the front which pushed the flange into the cat. PROBLEM solved. Even the delay when pulling out is gone. Thanks for the help. Safe travels.

 

 

quote name="chuckl1218" post="1678040" timestamp="1441558805"]

 

1. Make sure the head pipe flex section is seated as far forward as possible with the band clamp secured around the joint where flex part meets the 3rd cat. Also make sure the pipe support hanger is level. I had to twist the head pipe so that the hanger was level and everything else aligned properly and so that the head pipe did not hit the frame.

 

2. I don't know about this. Maybe due to the exhaust leak described in 1?

 

3. I had the same condensation. Tried loosening band clamps, verified proper installation of pipe joints and re-tightened / re-torqued. Still had condensation. So I called Corsa. Tech support guy was very friendly and helpful. He said this is normal and would go away after driving for a while. He also said to make sure all band clamps were properly torqued and that the clamp bolt was 90 degrees offset from the slit in the flange at each joint. He said the band clamps help seal the joints as the system is heated and settles in. And if you loosen the band clamps, increase by 5-10 ft lbs when re-torquing. I re-torqued mine and after a few days and a 3 hour highway trip, my condensation issues went away.

 

If you have any more issues, I recommend calling Corsa tech support. They are very helpful. I hope this helps you!

 

chuckl1218 Senior Enthusiast

chuckl1218

Posted
Posted
Great info. So when I removed my exhaust I took the hangers off. The hanger closest to the cat has angle to it and was facing the back of the truck. I removed it and flipped it facing the front which pushed the flange into the cat. PROBLEM solved. Even the delay when pulling out is gone. Thanks for the help. Safe travels.

quote name="chuckl1218" post="1678040" timestamp="1441558805"]

1. Make sure the head pipe flex section is seated as far forward as possible with the band clamp secured around the joint where flex part meets the 3rd cat. Also make sure the pipe support hanger is level. I had to twist the head pipe so that the hanger was level and everything else aligned properly and so that the head pipe did not hit the frame.

2. I don't know about this. Maybe due to the exhaust leak described in 1?

3. I had the same condensation. Tried loosening band clamps, verified proper installation of pipe joints and re-tightened / re-torqued. Still had condensation. So I called Corsa. Tech support guy was very friendly and helpful. He said this is normal and would go away after driving for a while. He also said to make sure all band clamps were properly torqued and that the clamp bolt was 90 degrees offset from the slit in the flange at each joint. He said the band clamps help seal the joints as the system is heated and settles in. And if you loosen the band clamps, increase by 5-10 ft lbs when re-torquing. I re-torqued mine and after a few days and a 3 hour highway trip, my condensation issues went away.

If you have any more issues, I recommend calling Corsa tech support. They are very helpful. I hope this helps you!

 

Thanks for posting back! That's awesome that it is fixed...glad I could help!

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