Go Back   Club Lexus Forums > Lexus Model Forums > GS Models > GS - Third Generation
Sign in using an external account
Register Forgot Password?

Exhaust pipe leak fixed, still sounds loud...

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 09-18-13, 06:17 PM   #1
charmz
Lead Lap
Trader Score: (0)
 
Join Date: Feb 2008
Location: Toronto
Posts: 426
Default Exhaust pipe leak fixed, still sounds loud...

So after patching my exhaust 2 times previously i finally gave in and decided to do it right this time....

I replaced the entire pipe from the cats up with a new piece that was fabricated to exact spec and no heat shield.


PROBLEM: my car still sounds like its leaking from somewhere.

THOUGHT: when i was using seafoam not too long ago, i notice that the car was smoking from the passenger side underneath the hood close to the back of the engine compartment...

QUESTION: anyone ever get a hole in the manifold? or maybe bad manifold gasket?


let me know what you guys think

thanks!
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!

Last edited by charmz; 09-18-13 at 06:41 PM..
charmz is offline   Reply With Quote
Old 09-18-13, 07:12 PM   #2
ibidu1
Lexus Test Driver
Trader Score: (1)
 
Join Date: Mar 2012
Location: FL
Posts: 1,568
Default

Being that you're in Canada your cars have to deal with snow, so im sure anything metal will get damaged there.

You can put your car on the rack and have someone rev the engine and just listen for exhaust leaks. You could have a bad gasket, cracked manifold, loose screws on the manifold. You wont know the exact leak source until you get it up on the rack and rev the engine.

For me I replaced only one side and the muffler shop grinded the area really good and removed the heat shielding. The heat shielding is what damages the pipes. Because debris gets trapped inside of it.
ibidu1 is online now   Reply With Quote
Old 09-18-13, 07:47 PM   #3
XxGoKoUxX
Lexus Champion
Trader Score: (0)
 
XxGoKoUxX's Avatar
 
Join Date: Jul 2009
Location: FL
Posts: 2,869
Send a message via AIM to XxGoKoUxX Send a message via MSN to XxGoKoUxX Send a message via Yahoo to XxGoKoUxX
Default

Quote:
Originally Posted by charmz View Post
So after patching my exhaust 2 times previously i finally gave in and decided to do it right this time....

I replaced the entire pipe from the cats up with a new piece that was fabricated to exact spec and no heat shield.


PROBLEM: my car still sounds like its leaking from somewhere.

THOUGHT: when i was using seafoam not too long ago, i notice that the car was smoking from the passenger side underneath the hood close to the back of the engine compartment...

QUESTION: anyone ever get a hole in the manifold? or maybe bad manifold gasket?


let me know what you guys think

thanks!
It could be ANYTHING and everything...... Most definitely have your exhaust removed and properly leak tested, rather than rev an engine. I'd have it all taken out, investigated, and patched according to what needs to be fixed !
XxGoKoUxX is offline   Reply With Quote
Old 09-18-13, 07:55 PM   #4
ibidu1
Lexus Test Driver
Trader Score: (1)
 
Join Date: Mar 2012
Location: FL
Posts: 1,568
Default

Quote:
Originally Posted by XxGoKoUxX View Post
It could be ANYTHING and everything...... Most definitely have your exhaust removed and properly leak tested, rather than rev an engine. I'd have it all taken out, investigated, and patched according to what needs to be fixed !
This is a proper way! But also can open a can of worms with seized/broken bolts. The northern cars are different then our FL cars, were pampered without having to deal with terrible rusting
ibidu1 is online now   Reply With Quote
Old 09-18-13, 08:08 PM   #5
XxGoKoUxX
Lexus Champion
Trader Score: (0)
 
XxGoKoUxX's Avatar
 
Join Date: Jul 2009
Location: FL
Posts: 2,869
Send a message via AIM to XxGoKoUxX Send a message via MSN to XxGoKoUxX Send a message via Yahoo to XxGoKoUxX
Default

Quote:
Originally Posted by ibidu1 View Post
This is a proper way! But also can open a can of worms with seized/broken bolts. The northern cars are different then our FL cars, were pampered without having to deal with terrible rusting
LOL, that's true too! We don't witness snow, and we BARELY (if in the inner coast of FL) ever witness salt while we're at that....
XxGoKoUxX is offline   Reply With Quote
Old 04-08-14, 06:34 PM   #6
striderg3
Driver School Candidate
Trader Score: (0)
 
Join Date: Mar 2014
Location: Canada
Posts: 46
Default

is it okay to drive my 3rd gen lexus GS without the heat shield? hope no plastic stuff is gonna burn / melt on the underbody?
striderg3 is offline   Reply With Quote
Old 04-08-14, 07:50 PM   #7
Schmexus
Lead Lap
Trader Score: (0)
 
Join Date: Dec 2013
Location: AZ
Posts: 434
Default

My invidia midpipe doesn't have a heat shield on it. Nothing has melted yet.
Schmexus is offline   Reply With Quote
Old 04-08-14, 08:19 PM   #8
XxGoKoUxX
Lexus Champion
Trader Score: (0)
 
XxGoKoUxX's Avatar
 
Join Date: Jul 2009
Location: FL
Posts: 2,869
Send a message via AIM to XxGoKoUxX Send a message via MSN to XxGoKoUxX Send a message via Yahoo to XxGoKoUxX
Default

I'm not 100% sure on this, but I believe the reason for the heatshield is for the catalytic converters, the cats get extremely hot while under load (the chemical reaction going on underneath there).

If you've removed your catsi n that area you should be okay I guess, but it's better to still have it so it doesn't heat up the cabin.
XxGoKoUxX is offline   Reply With Quote
Old 04-09-14, 10:10 AM   #9
07LXgs350
Pole Position
Trader Score: (0)
 
Join Date: Mar 2011
Location: ri
Posts: 250
Default

I think part of the reason for heat shields is so that nothing underneath your car will catch fire (like tall grass). Could be wrong.
07LXgs350 is offline   Reply With Quote
Old 04-09-14, 03:02 PM   #10
ibidu1
Lexus Test Driver
Trader Score: (1)
 
Join Date: Mar 2012
Location: FL
Posts: 1,568
Default

The heat shields are the problem for the exhaust pipes to leak. They heat shield and clamp design is poorly designed that it collects small debri. This is what causes the rusting, to be proactive you can just remove the exhaust shields.
ibidu1 is online now   Reply With Quote
Old 04-09-14, 03:08 PM   #11
charmz
Lead Lap
Trader Score: (0)
 
Join Date: Feb 2008
Location: Toronto
Posts: 426
Default

Im pretty sure its a hole in one or both of my manifolds..
I also get the rattle on cold starts (which I believe is from the manifold shield) and now a error code for bad cat.

Last edited by charmz; 04-09-14 at 03:13 PM..
charmz is offline   Reply With Quote
Old 04-09-14, 03:08 PM
 
 
 
 
Reply

Tags
2007, 350, exhaust, gs, leak, lexus, loud, pipe, sounds

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Exhaust manifold ticking sound ROSCOGX470 GX - First Generation 18 11-16-13 08:22 AM
leak from exhaust manifold shammi5 RX - First Generation 2 10-25-13 07:49 PM
Performance gurus HELP!!! Exhaust question... xuserx04 LS430 7 01-13-13 10:46 PM
TX WTB sc300 stock exhaust manifolds and cat Toshima SC400 / 300 Classifieds 2 10-19-12 07:52 AM
coolant hard pipe mkturbo3 GS - Second Generation 2 10-14-12 09:30 PM

All times are GMT -7. The time now is 01:43 AM.

Join ClubLexus
Advertising


Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS


Get all contact info