Cadillac Owners Forum banner
1 - 20 of 21 Posts

·
Registered
NONE
Joined
·
3,840 Posts
Discussion Starter · #1 ·
Hey guys, I have noticed that lately my exhaust sounds raspier on decel then it used to, especially RIGHT after I push in the clutch. Here are a few videos to show you what I'm talking about. The first one is from about a year ago (skip to 30 seconds in) and the second one is from today:



Is it all in my head or is something going on with the car?
 

·
Registered
2007 Escalade, 2005 CTS-V
Joined
·
24 Posts
Had the same on my M5 granted different cars, but it was the CAT deteriorating, don't know as much considering I'm a newbie but, it may also be baffles in your mufflers going.
 

·
Registered
2005 CTS-V, Black
Joined
·
2,163 Posts
Also agree on the cats. After I got my cats replaced with high flow ones on my GT, they got considerably louder as time passed. I wouldn't worry about it though, the car sounds good :thumbsup:
 

·
Registered
2012 CTS-V Sedan, 2011 CTS Coupe, 2010 Ford Raptor
Joined
·
3,546 Posts
Wow...almost the same set up and our cars sound WAY different!

I too have more popping as time goes on.
 

·
Registered
Raven Black 2004 CTS-V. Broken Diff!
Joined
·
342 Posts
sounds fantastic to me ;)
 

·
Registered
'05 CTS-V, '00 SLS, 98 SLS, 89 Eldo, '80 Eldo
Joined
·
3,988 Posts
You better get under there, and take a look. Sounds like one of those corsa losers swapped out your Magnaflow while you were hungover one night.
Just sayin.....

Hey, isn't the popping a condition of a lean mixture? And doesn't that kill your cats, if you have the rear O2s turned off?
 

·
Registered
NONE
Joined
·
3,840 Posts
Discussion Starter · #10 ·
You better get under there, and take a look. Sounds like one of those corsa losers swapped out your Magnaflow while you were hungover one night.
Just sayin.....

Hey, isn't the popping a condition of a lean mixture? And doesn't that kill your cats, if you have the rear O2s turned off?
From what I understand popping is a side effect of swapping out your resonator for an x pipe...
 

·
Registered
'05 CTS-V, '00 SLS, 98 SLS, 89 Eldo, '80 Eldo
Joined
·
3,988 Posts
From what I understand popping is a side effect of swapping out your resonator for an x pipe...
Very much doubt that. I have an x pipe with no popping at all.
I could be wrong (I'm certainly not one of the "smart" guys). But back in my bike days, when you change the exhaust, sometimes you get the popping on decel. Change the jets to richen up the mixture, and the popping was gone.
It doesn't sound bad, but compared to what it sounded like last year, I'd be pissed.
 

·
Registered
NONE
Joined
·
3,840 Posts
Discussion Starter · #12 ·
Very much doubt that. I have an x pipe with no popping at all.
I could be wrong (I'm certainly not one of the "smart" guys). But back in my bike days, when you change the exhaust, sometimes you get the popping on decel. Change the jets to richen up the mixture, and the popping was gone.
It doesn't sound bad, but compared to what it sounded like last year, I'd be pissed.
Yeah, I do remember adding a little fuel to the mix being the solution to reducing the popping...I am less concerned with the popping then the terrible sound it makes RIGHT after you let off the gas though. From what people are telling me its the cat's breaking down
 

·
Registered
'06 Z06, '05 CTS-V 453rwhp/434rwtq (sold)
Joined
·
4,452 Posts
Might you have any exhaust leaks that are changing the flow of exhaust?

I thought popping was from un-burnt fuel (rich mixture)? I thought the tuning solution to getting rid of the pop was removing fuel on decel?
 

·
Registered
NONE
Joined
·
3,840 Posts
Discussion Starter · #14 ·
Well does anyone have any ideas of what to do about it? Would gutting the cat's work? I have heard that gutting them decreses velocity and is a no-no, and that I should either run a straight pipe through them or get test pipes made.
 

·
Registered
2018 CT6E, old: 2014 XTS Vsport, 2005 CTS-V, 2004 CTS-V.
Joined
·
2,771 Posts
Just the opposite. DFCO or decel fuel cut off is a major contributor to popping.


Ted, you'll have to pull the exhaust to take a look at the cats. :)


Norm

Might you have any exhaust leaks that are changing the flow of exhaust?

I thought popping was from un-burnt fuel (rich mixture)? I thought the tuning solution to getting rid of the pop was removing fuel on decel?
 

·
Registered
Platinum 2004 CTS-V
Joined
·
4,914 Posts
If you don't care about it stinking, gut the cats. If they're going bad, might as well speed up the process. I didn't think your car sounded bad though. The only thing different is your tune since the last video, right?

Tony & Norm are right: popping on decel is because of lean mixture. Tuners add more fuel to get rid of it.
 

·
Registered
2005 CTS-V, Black
Joined
·
2,163 Posts
Who tuned it? Once I got my W4M my popping was gone.
 

·
Registered
NONE
Joined
·
3,840 Posts
Discussion Starter · #20 ·
Ron at Pro Dyno Tech in Crawfordsville, IN. I love the tune, and it made the car feel 100x better then the first tune...but now I have this damn noise (it was happening before the second tune but it has been getting worse)
 
1 - 20 of 21 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top