LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Strange sound after Hooker cat-back install.

Old May 4, 2003 | 02:00 AM
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Strange sound after Hooker cat-back install.

I dismissed this for quite some time thinking it would go away. It hasn't. There is a very unique sound that comes at idle and just normal driving SOMETIMES. It doesn't do it all the time, it comes from I would say by just ear from right under the console area. I only got a cat back so I don't know that it's that. But at the same time it didn't do it until the cat-back was put on. Any ideas??? Any one have the same thing happen to there's after cat-back install?
Thanks guys,
Stephen
Old May 4, 2003 | 03:34 AM
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What kinda sound????
Old May 4, 2003 | 05:19 AM
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Check the pipe over the axle,its probably hitting the panhard bar.
Old May 4, 2003 | 09:10 AM
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A lot of the time our cars have a lot of vibration. Could you be hearing a vibration sound, is it a rattle or maybe banging sounds? Like said above tell us what kind of sound your hearing?
Old May 4, 2003 | 09:31 AM
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Hmmm...it's not a clanking or banging, the sound occurs too rapidly if that makes since. I actually went through the console dept. to see if there was something in there, it's coming from right under the console area. It's definitely a unique sound, I don't wanna try to rule anything out...I honestly don't know what kind of sound, other than when it does it, it's very rapid, if it is something hitting something else it's doing it very fast. Does that help at all???
Old May 4, 2003 | 09:54 AM
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something hitting something else it's doing it very fast
Sounds like you are hearing the pffft, pfffft, pffft of an exhaust leak. Start your car and carefully put you havd about 1" to 2"s from all you connections and try to "feel" the puffs of exhaust on your hands. I just finished my exhaust with Jethot LT's, Mufflex y, and the Hooker. The only complaint I have is the poor fitment of the mufflex.
Old May 4, 2003 | 10:50 AM
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mine was hitting underneath the car in the back where the two peices of the body come together. just bent it back a little and it was fine. you're probably just tapping somethin w/ the exhaust
Old May 4, 2003 | 11:05 AM
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Originally posted by KeVMaN
mine was hitting underneath the car in the back where the two peices of the body come together. just bent it back a little and it was fine. you're probably just tapping somethin w/ the exhaust
yeah something is hitting the frame, if you didint have that noise until the install something is rubbing somehwere, just have to find out where, its its hard to do without a lift
Old May 4, 2003 | 11:12 AM
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re

Hmmm...it's not a clanking or banging
I still think he's got a leak.
Old May 4, 2003 | 01:34 PM
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Arrow

OK...I think I found out what the sound is coming from. The exhaust is hitting a rather large bracket about 5 inches wide right in the middle of the car. I don't know how to fix that...I guess I'll take it back to David's and get him to fix it. What's that piece called I'm hitting?
Old May 4, 2003 | 01:43 PM
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Originally posted by StephenF04
OK...I think I found out what the sound is coming from. The exhaust is hitting a rather large bracket about 5 inches wide right in the middle of the car. I don't know how to fix that...I guess I'll take it back to David's and get him to fix it. What's that piece called I'm hitting?
Isn't that the tunnel brace? Mine was hitting in the same exact place. The sound seemed like it was coming from directly under the passenger side floor board. They just need to pull the brace down a little and make sure that the pipe is off of it.
Old May 4, 2003 | 02:42 PM
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Originally posted by Ernster500
Isn't that the tunnel brace? Mine was hitting in the same exact place. The sound seemed like it was coming from directly under the passenger side floor board. They just need to pull the brace down a little and make sure that the pipe is off of it.
Probably what it is...I know mine personally sounds like it's coming from right under the console. So much so when I first heard it I thought something was rattling around in the console . I don't work Tuesday so I hope I can get it fixed then.
Old May 4, 2003 | 09:28 PM
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Unbolt the 4 bolts holding it in, put about 3-4 flat washers between the subframe and the brace, bolt the brace back in; that should fix your problem.
Old May 4, 2003 | 09:32 PM
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Originally posted by onebadponcho
Unbolt the 4 bolts holding it in, put about 3-4 flat washers between the subframe and the brace, bolt the brace back in; that should fix your problem.
That will probably work. Like I said, mine just had to be bent down a little and it worked like a charm...

The other thing I recently did was install an SLP drive shaft saftely loop. It replaces the tunnel brace and bolts right in. Not only is that thing beefy as all hec, but they made it to give the exhaust plenty of room! Maybe too much...that thing hangs LOW!!!

E
Old May 5, 2003 | 03:57 AM
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Originally posted by Ernster500
The other thing I recently did was install an SLP drive shaft saftely loop. It replaces the tunnel brace and bolts right in. Not only is that thing beefy as all hec, but they made it to give the exhaust plenty of room! Maybe too much...that thing hangs LOW!!!

E
A question about the driveshaft safety loop... did you have to remove the driveshaft to install that one or is the loop itself two pieces? I'd like to find one that's two pieces. I don't really need a loop because I hardly ever race, but it probably wouldn't hurt to put something stronger than that flimsy looking factory thing in there.
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