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Unread 09-07-2012, 12:14 PM   #1
autopc25
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1997 TJ Wrangler 
 
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hot spots and color distortion on muffler?

Have a '97 2.5L. Runs fine, idles fine, starts fine,new distributor, tune-up about 7K miles ago, no check engine lights.

The tech at a muffler shop said my aftermarket muffler show abnormal signs. He said there were hot spots or color distortions from excessive heat. The hot spot is on the end of the muffler towards the back of the Jeep. He said it might be misfiring from a bad injector leaking. I never remembered any misfires. I assumed the hot spot or color distortion was from the super hot exhaust gas from the cat converter? The cat heats up to 1200-1300 degrees right? Plus my muffler is welded about 14"-16" from the cat converter, could that be too close?

Is it possible the metal on the cheap aftermarket muffler is thin and shows heat more after it comes out of the cat converter?

Could the cat converter be too hot and bad?

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Unread 09-07-2012, 12:46 PM   #2
JBTJ
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Sounds like to me that you do not have a problem and you should not listen to a muffler tech of all people. The discoloration of a new muffler is very normal.
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Unread 09-07-2012, 12:49 PM   #3
77351wcj5
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If it aint broke........
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Unread 09-07-2012, 12:55 PM   #4
chachi44089
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Quote:
Originally Posted by JBTJ View Post
Sounds like to me that you do not have a problem and you should not listen to a muffler tech of all people. The discoloration of a new muffler is very normal.
Yup, what he said.
I just put a new muffler on both my jeep and explorer. ANd they look the same as you described. The high heat just burns some of the zinc coating at the hotter areas. You will soon see rust there..lol ..All is normal. The mechanic sound like an idiot, or he is trying to make some money off you. If you had a bad injector or other serious issue your check engine light would more than likely let you know.
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Unread 09-08-2012, 12:40 AM   #5
autopc25
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I actually went in thinking I might need a new cat because my MPG went down from about 15 MPG to 12-13 MPG. He was not trying to sell me anything. He actually told me not to buy a converter from him until I researched what was wrong. He thought whatever was wrong in his mind would damage the new cat. He was probably just wrong in his diagnosis?
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Unread 09-08-2012, 01:27 AM   #6
Pete3
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Aftermarket mufflers always get color distortion from my experience, unless you notice something performance wise, which a loss of 2mpg very well could be, I wouldn't worry. I doubt the muffler discoloration is related to that though.
I see an ugly muffler I want it painted black
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Unread 09-08-2012, 03:08 AM   #7
autopc25
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Quote:
Originally Posted by Pete3 View Post
Aftermarket mufflers always get color distortion from my experience, unless you notice something performance wise, which a loss of 2mpg very well could be, I wouldn't worry. I doubt the muffler discoloration is related to that though.
I see an ugly muffler I want it painted black
I was worried something was wrong like a bad injector or something else. Could care less about what a muffler looks like.

I do not ever remember hearing a back fire or misfire. I am thinking it is just the super hot exhaust gas from the cat since the muffler is mounted so close to it? I am not too happy with the slightly noisier tone of the aftermarket muffler so I probably will replace it anyway with a Walker Stainless Steel? I hear they are quiet.
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