Exhaust smell in cabin - after new Cats installed - CorvetteForum - Chevrolet Corvette Forum Discussion

Go Back  CorvetteForum - Chevrolet Corvette Forum Discussion > C5 Corvettes, 1997 - 2004 > C5 Tech
Reload this Page >

Exhaust smell in cabin - after new Cats installed

Notices
C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

Exhaust smell in cabin - after new Cats installed

Old 10-10-2018, 03:11 PM
  #1  
slang
Junior Member
Thread Starter
 
Member Since: Jan 2016
Posts: 25
Thanked 0 Times in 0 Posts
Default Exhaust smell in cabin - after new Cats installed

Hello!

I have a 2003 Corvette zo6. I just had a set of new cats installed at an exhaust shop.

This is the part:
Magnaflow 93989 | CHEVROLET CORVETTE | 5.7L | Catalytic Converter-Direct Fit | Standard Grade EPA

Before install there was no exhaust smell in the cabin when I Idle. however after install the smell is there, only when I dont move (which makes me think its at the front of the car). I took it back to the shop and they didn't see any leaks in the weld joints.

Anyone have this issue before? I didn't buy a gasket for the new cats - and no one advised me to get one could that be my issue?

any help would be appreciated!
slang is offline  
Old 10-10-2018, 05:42 PM
  #2  
grantv
CF Senior Member
 
grantv's Avatar
 
Member Since: Sep 2014
Location: Kelowna BC
Posts: 4,787
Thanked 441 Times in 409 Posts
Default

Does it actually have the pup cats as shown?
Were the previous cats done for, or PO removed?
Yes the gasket may be the cause. Did they run a smoke test or just visual?
The smell will only be pronounced when sitting still generally.
grantv is online now  
Old 10-10-2018, 05:58 PM
  #3  
slang
Junior Member
Thread Starter
 
Member Since: Jan 2016
Posts: 25
Thanked 0 Times in 0 Posts
Default

yea they had the pup cats, everything in the picture here is the part: https://www.hottexhaust.com/Magnaflow_93989

they just did a visual check, no smoke test. My previous cats were done for - i was getting the cat code on the driver side. My O2 sensor voltage proved that the cat was in fact bad (I graphed the voltage).
slang is offline  
Old 10-10-2018, 07:06 PM
  #4  
redzg
CF Senior Member
 
Member Since: Mar 2017
Location: Orlando Florida
Posts: 750
Thanked 93 Times in 90 Posts
Default

Originally Posted by slang View Post
I graphed the voltage
Yeah for data! Exhaust can be trickier than one might expect. There isn't any way to move the head pipes without dislodging the entire set -- and new cats have an odor all their own...
redzg is offline  
Old 10-10-2018, 09:33 PM
  #5  
bwill03z
CF Senior Member
 
Member Since: Nov 2011
Location: sw VA
Posts: 1,205
Thanked 30 Times in 28 Posts
Default

For me when I added new high flow metallic cats I had a very strong smell that you could smell inside the cabin for awhile until they get “broken in”. It’s normal
bwill03z is offline  
Old 10-11-2018, 12:39 PM
  #6  
slang
Junior Member
Thread Starter
 
Member Since: Jan 2016
Posts: 25
Thanked 0 Times in 0 Posts
Default

Originally Posted by bwill03z View Post
For me when I added new high flow metallic cats I had a very strong smell that you could smell inside the cabin for awhile until they get “broken in”. It’s normal
Do you by chance remember roughly how long? I have had them installed for a little over 2 weeks and she is my daily driver.

slang is offline  
Old 10-11-2018, 01:07 PM
  #7  
bravo29
CF Senior Member
 
bravo29's Avatar
 
Member Since: Apr 2017
Location: Woodridge IL
Posts: 459
Thanked 37 Times in 28 Posts
Default

When I did my Trans Am LS1 it took about 2 months for the smell to go away. If you drive less it will take longer.

Last edited by bravo29; 10-11-2018 at 01:13 PM.
bravo29 is offline  
Old 10-11-2018, 08:53 PM
  #8  
bwill03z
CF Senior Member
 
Member Since: Nov 2011
Location: sw VA
Posts: 1,205
Thanked 30 Times in 28 Posts
Default

Originally Posted by slang View Post
Do you by chance remember roughly how long? I have had them installed for a little over 2 weeks and she is my daily driver.
No I really don’t remember, sorry
bwill03z is offline  
Old 10-12-2018, 12:42 AM
  #9  
striper
CF Senior Member
 
striper's Avatar
 
Member Since: May 2005
Location: Sussex County New Jersey
Posts: 6,236
Thanked 195 Times in 170 Posts
Default

Now that you've done the cats maybe you should consider changing the O2 sensors.
striper is offline  


Thread Tools
Search this Thread
Sponsored Ads
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: