Odd Noise Upon Acceleration

96TangerineBossGT · 07-17-2006, 08:26 PM

I recently installed a complete exhaust system on my 95 v-6. I have MAC shorties and catted h-pipe, with a flowmaster american thunder muffler system. The problem I have is that upon acceleration, I have a really loud airy, almost metallic type noise. It is what I would call raspy, but for some reason I think that my definition of raspy may be different than others (that's a shot at those that think flowmasters on a 6 sound "raspy"-I had flows on before this new setup as well and I get is a nice deep, smooth sound from the mufflers throughout the rpm range).

Back to the issue...

It sounds like a really large exhaust leak, but I have taken things about and put back together many times, tightened everything as tight as I can possibly get them, and have sprayed soap/water on each connection, only to find no leaks. I know it is not the headers because I had to install the h-pipe/mufflers before I received the headers and the noise was present then with the stock manifolds. Every sound clip I can find of a 6 has no noise like this. Has anyone seen/heard of anything like this? It can only be heard when under load. Under light pedal, like steady driving, you can't hear, but when you mash the gas it is there.

I tried to explain the best I could. I know a sound clip would help, but right now I have no way of capturing one. Your thoughts....?

Scott

mustangV6_04 · 07-18-2006, 05:28 AM

Huh..sounds like your flux capacitor might be going bad lol jk

spike_africa · 07-18-2006, 06:24 AM

Sounds like an exhaust leak to me.

csledd · 07-18-2006, 06:30 AM

does it make this sound in the high rpms also?

96TangerineBossGT · 07-18-2006, 07:07 AM

Quote:

Originally Posted by csledd

does it make this sound in the high rpms also?

Not that I can tell. The mufflers get kind of loud around 2500-redline, but it does seem to fade up top.

96TangerineBossGT · 07-18-2006, 07:12 AM

Quote:

Originally Posted by spike_africa

Sounds like an exhaust leak to me.

See, and that's why I have taken everything off several times in the past 2 weeks or so, but to create this type of noise, and as loud as it is, it would have to be a MAJOR leak and there is nothing that I can find. My GT has a leak at the passenger collector, but it has the distinct tick tick when giving it gas and can only be heard from inside the car with the windows up and the radio off.

Blk02stang · 07-18-2006, 06:52 PM

Is it possible the EGR tube might be cracked open?

96TangerineBossGT · 07-18-2006, 07:47 PM

Quote:

Originally Posted by Blk02stang

Is it possible the EGR tube might be cracked open?

Well, I did not take the tube all the way off (only disconnected from the manifold and attached to the header) when I did the headers and the fact remains that the noise wasn't present in stock form.

Here is a theory that I am going to explore later as soon as I get the chance. I was looking at it tonight and it does appear that on the passenger side, the downpipe is at slight angle where it attaches to the catalytic converter/h-pipe part of the system (Header>Flange>Downpipe>Flange>catalytic converter and h-pipe>Flange>Muffler and tailpipe). My theory is that maybe the connection is opening up when the engine torques, since the noise is only present at medium to heavy load and passes the soap and water leak test at idle. Hopefully I can work on it here in the next day or 2. I mean, I noticed that the connection wasn't perfect, but I had those nuts as tight as I could get them, so I figured it would be ok.

Thanks for the help. Keep the possibilities coming. I'll post back with what I come up with.

07-17-2006, 08:26 PM	#1 (permalink)
96TangerineBossGT Senior Member Join Date: Aug 2005 Location: Clayton, NC Posts: 441	Odd Noise Upon Acceleration I recently installed a complete exhaust system on my 95 v-6. I have MAC shorties and catted h-pipe, with a flowmaster american thunder muffler system. The problem I have is that upon acceleration, I have a really loud airy, almost metallic type noise. It is what I would call raspy, but for some reason I think that my definition of raspy may be different than others (that's a shot at those that think flowmasters on a 6 sound "raspy"-I had flows on before this new setup as well and I get is a nice deep, smooth sound from the mufflers throughout the rpm range). Back to the issue... It sounds like a really large exhaust leak, but I have taken things about and put back together many times, tightened everything as tight as I can possibly get them, and have sprayed soap/water on each connection, only to find no leaks. I know it is not the headers because I had to install the h-pipe/mufflers before I received the headers and the noise was present then with the stock manifolds. Every sound clip I can find of a 6 has no noise like this. Has anyone seen/heard of anything like this? It can only be heard when under load. Under light pedal, like steady driving, you can't hear, but when you mash the gas it is there. I tried to explain the best I could. I know a sound clip would help, but right now I have no way of capturing one. Your thoughts....? Scott __________________ 96 GT Mods: VT Stage IIs, Stage 2.5 Ported PI heads from New Kid Cylinder Head in Kansas City, PI Intake, BBK Plenum, BBK 75mm Throttlebody, BBK Fenderwell Cold-Air, 3.55s, Steeda Tri-Ax, SCT PRP Tune, FRPP Shorties, BBK Off-Road H, Flowmaster Catback, Steeda Adj./Quad., 180* tstat, Fidanza Aluminum Flywheel, McLeod performance clutch

07-18-2006, 05:28 AM	#2 (permalink)
mustangV6_04 04 DSG V6 Join Date: Oct 2005 Location: Palm Coast, Florida Posts: 419	Huh..sounds like your flux capacitor might be going bad lol jk __________________ 2004 Dark Shadow Grey 5 speed V6 MAC o/r H-pipe Stock gt exhaust Fog Lights 17x10.5'' bullits(from MT) in rear with 315 sumis MT Cold Air Intake Ford 8.8 rear end with 3:73 frpp gears Mach 1 chin spoiler Mach 1 Grill Delete

07-18-2006, 06:24 AM	#3 (permalink)
spike_africa Administrator Join Date: Sep 2004 Location: Orlando,Florida Posts: 7,207	Sounds like an exhaust leak to me. __________________ Dustin 2002 GT Mustang 5-Speed Drag Radials,Sprayed,Powershifted WOOO HOOOO!

07-18-2006, 06:30 AM	#4 (permalink)
csledd DSG!!! Join Date: Feb 2005 Location: Paducah, KY Posts: 3,074	does it make this sound in the high rpms also? __________________ CAP DSG Registry 2003 Mustang GT - daily driven check out my cardomain for more info 296 rwhp / 310 rwtq Money spent @ AM: $4623.20 1984 Mustang Hatch - low budget project

07-18-2006, 06:52 PM	#7 (permalink)
Blk02stang I 8urvtec!! Join Date: Mar 2005 Location: Va Posts: 815	Is it possible the EGR tube might be cracked open? __________________ New toys '07 F-150 black on black and completely blacked out! '96 Mitsu eclipse RS: 'jus your average 2nd gen with a small block 331c.i. and a few bolt-on goodies(175shot) and rwd...1st one to be done! SOLD 2004 GT Annv. edition. Custom Exhaust: o/r X pipe: Eibach Sportline full suspension: Clutchmasters stage 4 clutch: K&N filter: Steeda Tri-ax shifter: Mach 1 shift knob: BFG Drag radials: Compucar "nitrous-n-a-bag" 80-shot Stage I, Compucar Wet kit 125shot stage II

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