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Old 06-26-2002, 12:39 AM   #1
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Question Is this an exhaust leak or is it normal?

My current exhaust set up is Mac 1 3/4" longtubes, 2 1/2" shorty h-pipe and 2 1/2" flowmasters w/turndowns. After I installed all of this exhaust I checked, rechecked and rechecked again for exhaust leak and tightened everything down. I hear, what I think is exhaust pulses combining in the collector right under when I am sitting and they get faster and a little louder when I accelerate (and sometimes go away when my exhaust is at certain sound levels). I wanted to know if this is a normal sound from longtubes and an aftermarket exhaust?? I do also hear some crackling and popping when I accelerate hard and then get off the gas. My current major mods are also TFS heads, e-cam, fully ported cobra intake, A-trim @ 10 psi and other bolt-ons. As I said before everything is very tight and I doubt if there are any leaks.... can anyone help me with these noises?
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Old 06-26-2002, 08:03 AM   #2
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Question HELP!!

Can Anyone help me with this?!?
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Old 06-26-2002, 08:44 AM   #3
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It all depends. You should be able to hear an exhaust leak from the outside of the car with it running. Have a friend hop in the drivers seat and give it a few good revs while you listen closely for any exhaust leaks. Longtubes do make a lot of noise by nature anyway. You can hear each cylinder fire independantly in most cases... it sounds kinda' cool to me, but it sure doesn't sound like a leak. The only way to tell if it's leaking or not is to do what I said above, but rest assured that you can usualy hear the exhaust travel through them. As far as your crackling and popping, that's hard to determine from your description. If it crackles and pops durring decelleration, then more than likely you have an exhaust leak... that's a very common sound when you have any kind of exhaust leak. If you are hearing a crackling or popping noise durring accelleration, then you are detinating and that's a whole different ball game. Hope this helps.
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Old 06-26-2002, 06:22 PM   #4
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???

WA2FAST, sound like some good advice. I actually checked my car on the outside at idle and there are no exhaust leak sounds...I also had a friend hit the gas several times and I really didn't hear anything out of the norm. So I don't think there are any leaks near the flanges on the head. BUT, I still do have a little bit of the popping ONLY when deccelerating after hard acceleration...some people say it might be an exhaust leak at the collector or somewhere on the h-pipe or it's a result of running very rich...what do you think about this stuff?
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Old 06-27-2002, 08:32 AM   #5
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If you have an exhaust leak, you should be able to hear it when your friend is reving your engine. If not, there are sometimes leaks that are only evident when decelerating like you are talking about. Where is the popping coming from and what does it sound like? Is it coming from the front/mid secion of the car (exhaust leak), or is it coming from your dumps/tailpipes (out of your exhaust)? There is a big difference. Does it happen only when you decelerate AFTER accellerating hard, or is it prety much all of the time when you decellerate?
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