Exhaust leak?

JRubin2000 · October 26th, 2006, 01:38 AM

Hey, ive been hearing a slight hissing noise from the passanger side of my engine under hard acceleration. I think it may be an exaust leak. I have flowmaster weld in's and i scraped them on a speed bump about 2 weeks ago. How do i check if its a leak, and if it is what bolts should i tighten? Also, i live in NY and need to pass emissions, would the leak affect emissions? Thanks guys i appreciate the help.

handyandy · October 26th, 2006, 09:02 AM

It could be the exhaust, but maybe not. If you have a CAI, mine hisses when I accelerate a little bit. Or maybe its something else.. anyway just something to think about.

JRubin2000 · October 26th, 2006, 09:13 AM

Yea i have a drop in filter with the silencer removed, so there is a chance that its that

purevenom1 · October 27th, 2006, 05:32 PM

It could be the exhaust flange gasket where the h-pipe bolts to the manifold/header. Could be blowed out.

03 R Code · October 27th, 2006, 05:49 PM

best way to find out, stick your head under the car, and listen while someone else hits the gas. If you want you could get something light and place it close to the area you are looking at and see if whatever it is is blowing around when the exhaust starts hissing.

But if you think the weld in mufflers got drug loose then the only way I know to fix them is get them re-welded?

raceruler03 · October 27th, 2006, 07:26 PM

yeah I agree, but I think the best way is to just listen to it.

JRubin2000 · October 27th, 2006, 08:19 PM

I went under the car today, and had my friend give it some gas. The hiss seems to be coming from behind the throttle body and plenum in one of those lines, but before we could figure out where it was exactly, it started raining. Any idea? Worst case, im bringing my car to the dealership for a clutch pack next week, i can ask them to take a look at it.

03 R Code · October 28th, 2006, 09:15 AM

Probably a vaccum line if it's from the plenum or TB. Be sure all these are plugged in all the way and not leaking any.

ChrisJ · October 28th, 2006, 10:01 AM

Vacuum line would be my guess as well...

JRubin2000 · October 28th, 2006, 12:10 PM

Alright ill take another look as soon as the rain over here stops. But yea in the back of my head i was thinking vacuum line. Thanks a lot guys. Have a good one.

MnrlGry01gt · October 29th, 2006, 01:07 AM

i had a vaccum leak and what happened was when I would drive with my AC on it would sometimes start blowing on like the defroster or on the windsheild.

October 26th, 2006, 01:38 AM	#1
JRubin2000 Regular Join Date: Sep 2006 Location: Staten Island, New York Posts: 203	Exhaust leak? Hey, ive been hearing a slight hissing noise from the passanger side of my engine under hard acceleration. I think it may be an exaust leak. I have flowmaster weld in's and i scraped them on a speed bump about 2 weeks ago. How do i check if its a leak, and if it is what bolts should i tighten? Also, i live in NY and need to pass emissions, would the leak affect emissions? Thanks guys i appreciate the help. __________________ http://img.photobucket.com/albums/v5...000/modded.jpg Check out my band Wrong End Of The Gun at www.myspace.com/wrongendofthegun

October 26th, 2006, 09:02 AM	#2
handyandy Regular Join Date: Oct 2006 Posts: 105	It could be the exhaust, but maybe not. If you have a CAI, mine hisses when I accelerate a little bit. Or maybe its something else.. anyway just something to think about. __________________ 2001 Mineral Grey GT - 5 Speed -full bolt-ons, 4.10's http://i36.photobucket.com/albums/e2.../mySTANG-1.jpg

October 26th, 2006, 09:13 AM	#3
JRubin2000 Regular Join Date: Sep 2006 Location: Staten Island, New York Posts: 203	Yea i have a drop in filter with the silencer removed, so there is a chance that its that __________________ http://img.photobucket.com/albums/v5...000/modded.jpg Check out my band Wrong End Of The Gun at www.myspace.com/wrongendofthegun

October 27th, 2006, 07:26 PM	#6
raceruler03 Enthusiast Join Date: Aug 2006 Location: georiga Posts: 776	yeah I agree, but I think the best way is to just listen to it. __________________ http://i157.photobucket.com/albums/t...donecopy-1.jpg

October 27th, 2006, 08:19 PM	#7
JRubin2000 Regular Join Date: Sep 2006 Location: Staten Island, New York Posts: 203	I went under the car today, and had my friend give it some gas. The hiss seems to be coming from behind the throttle body and plenum in one of those lines, but before we could figure out where it was exactly, it started raining. Any idea? Worst case, im bringing my car to the dealership for a clutch pack next week, i can ask them to take a look at it. __________________ http://img.photobucket.com/albums/v5...000/modded.jpg Check out my band Wrong End Of The Gun at www.myspace.com/wrongendofthegun

October 27th, 2006, 05:32 PM	#4
purevenom1 Regular Join Date: Oct 2006 Location: NC Posts: 171	It could be the exhaust flange gasket where the h-pipe bolts to the manifold/header. Could be blowed out.

October 27th, 2006, 05:49 PM	#5
03 R Code Hardcore Enthusiast unstoppable @ speed of light Join Date: Jul 2006 Location: Knees deep in dat ass Posts: 2,842	best way to find out, stick your head under the car, and listen while someone else hits the gas. If you want you could get something light and place it close to the area you are looking at and see if whatever it is is blowing around when the exhaust starts hissing. But if you think the weld in mufflers got drug loose then the only way I know to fix them is get them re-welded?

October 28th, 2006, 09:15 AM	#8
03 R Code Hardcore Enthusiast unstoppable @ speed of light Join Date: Jul 2006 Location: Knees deep in dat ass Posts: 2,842	Probably a vaccum line if it's from the plenum or TB. Be sure all these are plugged in all the way and not leaking any.

October 28th, 2006, 10:01 AM	#9
ChrisJ The Cable Guy... 2002 Mustang GT SLOW Join Date: Jun 2006 Location: Shepherdsville, Kentucky Posts: 15,386	Vacuum line would be my guess as well... __________________ My Junk www.myspace.com/cjobe

October 28th, 2006, 12:10 PM	#10
JRubin2000 Regular Join Date: Sep 2006 Location: Staten Island, New York Posts: 203	Alright ill take another look as soon as the rain over here stops. But yea in the back of my head i was thinking vacuum line. Thanks a lot guys. Have a good one. __________________ http://img.photobucket.com/albums/v5...000/modded.jpg Check out my band Wrong End Of The Gun at www.myspace.com/wrongendofthegun

October 29th, 2006, 01:07 AM	#11
MnrlGry01gt Regular Join Date: Jul 2006 Posts: 328	i had a vaccum leak and what happened was when I would drive with my AC on it would sometimes start blowing on like the defroster or on the windsheild.

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