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Old 10-20-2010, 10:41 AM   #1
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Exclamation easy fix i just know it!!

so i am having this problem where when i start to accelerate the muffler pipe ( i think) is hitting the skid plate underneath. i can feel it through the floor and sometimes its really loud.i took it to a shop who couldnt find the problem of course. so i looked like an idiot. i asked if there is any way to lower the skid plate enough to where it wouldnt toucha and he said he could do no such thing??!! so now i dont know what to do, i dont want a hole knowcked into my pipe nor do i want to mess up the skid plate or shake something loose! ANY IDEAS???

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Old 10-20-2010, 10:46 AM   #2
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What skid plate is on your jeep? Stock exhaust?

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Old 10-20-2010, 10:48 AM   #3
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There is a heat shield above the catalytic converter that the exhuast pipe will sometimes come in to contact with. You could try checking that out as well. It's pretty easy to bend a little if you need to. Just a thought....
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Old 10-20-2010, 10:50 AM   #4
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Do you see marks where contact is being made?
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Old 10-20-2010, 11:57 AM   #5
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Check Transmission Mount.
Mine let loose and ended up ripping bracket off converter after a while.
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Old 10-20-2010, 04:21 PM   #6
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Quote:
Originally Posted by MR.CLIFFORD
What skid plate is on your jeep? Stock exhaust?
Cliff it's I guess just a regular skid plate, no aftermarket. But my muffler is but , it was doing his before I put my dynomax muffler on. I believe it is the cat back part that goes from the engine down the tube that connects to the muffler under the skid plate.
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Old 10-20-2010, 04:22 PM   #7
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Quote:
Originally Posted by Raleighjeeper
There is a heat shield above the catalytic converter that the exhuast pipe will sometimes come in to contact with. You could try checking that out as well. It's pretty easy to bend a little if you need to. Just a thought....
Is there way u can take a pic of this, I'm very visual!! Ha
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Old 10-20-2010, 07:45 PM   #8
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Get under the Jeep and check ALL the hangers.
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Old 10-21-2010, 07:49 AM   #9
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Originally Posted by awcressey View Post
Is there way u can take a pic of this, I'm very visual!! Ha
It will be right aboove the catalytic conveter which looks like this on passenger side near transmission.
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Old 10-21-2010, 08:17 AM   #10
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Quote:
Originally Posted by awcressey View Post
so i am having this problem where when i start to accelerate the muffler pipe ( i think) is hitting the skid plate underneath. i can feel it through the floor and sometimes its really loud.i took it to a shop who couldnt find the problem of course. so i looked like an idiot. i asked if there is any way to lower the skid plate enough to where it wouldnt toucha and he said he could do no such thing??!! so now i dont know what to do, i dont want a hole knowcked into my pipe nor do i want to mess up the skid plate or shake something loose! ANY IDEAS???

I had a similar thing happening, only my muffler pipe was hitting the frame at the very end. A clamp and some wire ties and issue was resolved. Mine was only when accerlerating from a dead stop...can you wiggle the pipe up agianst the frame?
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Old 10-21-2010, 10:09 AM   #11
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Quote:
Originally Posted by awcressey View Post
so i am having this problem where when i start to accelerate the muffler pipe ( i think) is hitting the skid plate underneath. i can feel it through the floor and sometimes its really loud.i took it to a shop who couldnt find the problem of course. so i looked like an idiot. i asked if there is any way to lower the skid plate enough to where it wouldnt toucha and he said he could do no such thing??!! so now i dont know what to do, i dont want a hole knowcked into my pipe nor do i want to mess up the skid plate or shake something loose! ANY IDEAS???
I had that same noise in my 99. It wasn't the muffler. It was a bearing for the transfer linkage that attach to the body. It is at the left of the transmision attached to the center tunnel. That's why you feel it through the floor. Part # is 52078134 and goes for about $6.00.
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Old 10-24-2010, 09:47 PM   #12
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Quote:
Originally Posted by LaterJim

I had a similar thing happening, only my muffler pipe was hitting the frame at the very end. A clamp and some wire ties and issue was resolved. Mine was only when accerlerating from a dead stop...can you wiggle the pipe up agianst the frame?
Thinking it is my converter hitting the skid plate I just looked at it today.but now it's getting to the point where it does it when I shut off the car as well.
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Old 10-24-2010, 09:56 PM   #13
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Thinking it is my converter hitting the skid plate I just looked at it today.but now it's getting to the point where it does it when I shut off the car as well.
Are you sure it's not a bad cat? The ceramic honeycomb inside the cat will rattle and sound like your exhaust is hitting something.
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Old 10-24-2010, 10:36 PM   #14
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pretty sure, just got a new engine almost a year ago and that was replaced, although firestone did the repair so it wouldnt surprise me!!
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Old 10-25-2010, 09:42 AM   #15
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Boss, get under there when your exhaust is cold and move it around. Use your ears to pin point the noise. Fix the problem.

Jeeps are that simple.
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Old 10-25-2010, 09:59 AM   #16
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I had one vehicle doing this same thing and we checked everything from the header flange to the exhaust and couldn't find a thing...then while watching it under the hood and accelerating by pulling the throttle cable-voila! The ENGINE lifted up-there was a broken engine mount. Under acceleration, the engine would 'lift' up enough to move the exhaust system and bang-there was your noise under the floor.
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Old 10-25-2010, 11:20 AM   #17
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I am having a similiar problem. My cat is now hitting my skyhacker skid (1" body lift, 2.5" susp lift, SYE and such) after the install of the skid. Should I just lower my skid a bit and reset the pinion angle or is there a way to just bend the hangers a bit (without hurting/torqueing the exhaust tubes)?
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Old 10-25-2010, 12:40 PM   #18
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Exhaust vibration

You may want to look at the Manifold exhaust bracket also. I recently found this on my 97 TJ 4.0 5 speed. Make sure that the exhause has not slipped down on the gasket flange of the manifold that will allow the weight of the pipe to hit the front driveshaft or the front of the skid plate. If this pipe drops and or the cat holder bushing is worn, it can hit something in those areas when any vibration is applied to the driveline. My cat inlet pipe recently broke a weld and now needs tp be replaced due to the stress on it from the loose manifold connection of the upper exhaust pipe. There is not much clearance between the front shaft anyway. Since your TJ is lifted, check your rear torsin link bar for the clearance behind the axle where it comes the closest to the rear exhaust pipe and Gas tank shield too.
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Old 10-25-2010, 01:52 PM   #19
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Do you happen to have an after market trailer hitch? My tailpipe used to knock the hell out of it, but it stopped once I took off the hitch when I installed a new rear bumper with a built-in.
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Old 11-13-2010, 09:39 AM   #20
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Quote:
Originally Posted by balleta View Post
I had that same noise in my 99. It wasn't the muffler. It was a bearing for the transfer linkage that attach to the body. It is at the left of the transmision attached to the center tunnel. That's why you feel it through the floor. Part # is 52078134 and goes for about $6.00.
Did yours make the noise upon take off and when starting and and turning off the engine. mine is making a noise that i thought was my sway bar links which i had just replaced. I disconnected them and still had the noise. I had friend help me start and stop the engine and he noticed when he pushed down the 4wd handle the noise went away. Just curious if this sounds like the same thing you had happening?
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Old 11-13-2010, 09:52 AM   #21
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I had the same problem the cat was hitting the skid . I redone the whole system I have a bud that has a muffler shop he let me go in on sunday and use the shop I bent all new . Glade I did now I can do the tummy tuck
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Old 11-13-2010, 12:37 PM   #22
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Are you sure it's not a bad cat? The ceramic honeycomb inside the cat will rattle and sound like your exhaust is hitting something.
my cat heat shield was rusted and loose was rattling so I just ripped it off.
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Old 11-13-2010, 01:38 PM   #23
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I get same type of vibrations but only at take off, my transmition mount was broke and I replaced it, but it still vibrate at take off....

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