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93 Nissan Altima exhaust
04-11-2012, 06:04 AM
Post: #1
93 Nissan Altima exhaust
I have a 1993 Nissan Altima, 4 cylinder, 5 speed manual. I live near Eugene, Oregon. I think I may have a clogged exhaust or an exhaust leak, but I'm not completely sure. At first I noticed an awful smell right behind the front tires and inside the car. I thought at first I might have spilled some fluid when topping them off. Then my car started running very bad last week. It acted like I was running on empty but had over a half tank of gas. Then I noticed when I got home that with the car running there was no smoke coming out of the exhaust. I still have that bad smell and there's nothing coming from the exhaust when on. Any ideas on what it could be? Thanks for any help and information.
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04-11-2012, 10:16 AM
Post: #2
RE: 93 Nissan Altima exhaust
I would say that your suspicion is correct. Most people describe the smell as that of "rotten eggs." In most cases it is the Catalytic Converter that melts shut. In some cases the inside parts of the Catalytic Converter break up and get blown to the back of the exhaust and get stuck in the muffler. You can tell which one is clogged by breaking the exhaust between the two. If the car runs unrestricted, the muffler is plugged. If it is the same, the converter is plugged.

Please let us know what you find.

Thanks for using the forum,
Garner

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04-11-2012, 11:05 AM
Post: #3
RE: 93 Nissan Altima exhaust
I have to add that "nothing out of the exhaust" (the end of the pipe) is only part of the diagnosis. Any air going into the engine MUST get out. The key is to finding where it gets out. (the leak) or as Garner suggests, where it's restricted, which means the exhaust flow is greatly reduced so you hardly feel anything out the tail pipe even though there's something.

Hint: if you look around under the car you may see signs of things that are melted. (undercoat, rubber mounts, etc) and if it's near the cat that's another clue.

Obviously the cat my need replacing (or more) but likely there's a running issue that also needs to be resolved so that doesn't happen again.
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