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[Exhaust](/topics-exhaust-chevy/) leak right before the [...


[Exhaust](/topics-exhaust-chevy/) leak right before the [muffler](/topics-muffler-chevy/). P0420 code, but ran fine for a while. Started misfiring intermittently, but no code for a while until last night P0300. Rough idle. Mec...

[Exhaust](/topics-exhaust-chevy/) leak right before the [muffler](/topics-muffler-chevy/). P0420 code, but ran fine for a while. Started misfiring intermittently, but no code for a while until last night P0300. Rough idle. Mechanic's Assistant: Have you seen the misfire code before? Has the car been stalling? No, first time with the code, but it has been misfiring for about a week. No stalling. Mechanic's Assistant: What is the make/model/year of your car? 2006 chevy suburban 3/4 ton 6.0L Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far? I tried two bottles of Lucas fuel injector cleaner. Mechanic's Assistant: Anything else you want the Mechanic to know before I connect you? Recent [engine](/topics-engine-chevy/) work: new cam shaft, [head gaskets](/topics-head-gasket-chevy/), plugs and wires.

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Responses

Automotive Expert
Hello, my name is \*\*\*\*\* \*\*\*\*\* I will be happy to assist you with this running problem. The P0420 code indicates a problem with the catalytic convertor. I see where you had some engine work done, but if the convertor has over 100,000 miles on it, it is probably starting to go bad and that may be what is causing your general misfire code (P0300).

What would the exhaust leak fluid look like if the cat was bad?
Automotive Expert
It would be like black water coming out of the bleed hole in either the cat or the muffler. The exhaust would also start smelling like sulfur or rotten eggs, especially when during hard acceleration.

Hmm, not sure about the smell, smells normal to me.

Customer attachment 1/3/2021 6:42:15 PM

This is the leak, and the fluid dripping is clear.
Automotive Expert
That's your exhaust leak for sure. That clamps needs to be either tightened or replaced. Spray some penetrating oil on the clamp bolt and let it set for about an hour before you try to tighten it, or that bolt may break. There's a lot of rust there.

Yea, I yanked on that bolt for a good half hour and it didn't budge. I don't have any penetrating oil on me (I'm traveling), but wd40 didn't seem to help.
Automotive Expert
WD40 is not a penetrate. You need something like PB'laster or Knock'er Loose. You can buy those at any auto parts store, or even any WalMart.

Ahh ok gotcha. Oriellys is open down the street. There's an o ring in there too, correct?
Automotive Expert
No, there is not.

Ok cool, so it's just that clamp.

Customer attachment 1/3/2021 7:02:31 PM

Will this work as a replacement?
Automotive Expert
As long as it fits the pipe and can be tightened it should.

Ok great. Thanks so much for your help, James! Road trip fun!
Automotive Expert
You are most welcome. It has been my pleasure. If you need anything else, please let me know through this chat box and I will do my best to assist you. I wish you well. Have fun on your road trip, and thank you for using JustAnswer.

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