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C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Mar 30, 2008 | 05:38 PM
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Just ran the car for a while and noticed it smoking, I thought it was maybe a leak. So I checked it out and no leak. I decided to look under the car and I noticed that the exhaust right after the small catylitic convertor? was glowing red. any ideas???????
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Old Mar 30, 2008 | 06:16 PM
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Running rich or a clogged Cat would be my first two guesses. Stay tuned for other input though.
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Old Mar 30, 2008 | 08:57 PM
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From what I hear, those small cats go out or clog before the main cat. I think I have small cat problems as well. My car is running rich and I don't know if that could be why one of my cats rattles like a baby toy at idle, but I have to do something soon b/c its driving me nuts. My problem is that I wanna do away with them altogther, but I can't find a shop to put in straight pipes from the engine to the main cat. Looks like I'll be doing this one on my own. Of course, you could just replace the cats with new ones.
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Old Mar 30, 2008 | 09:00 PM
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hey guys, can you convert these cars to a real dual exhaust?
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Old Mar 30, 2008 | 09:01 PM
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and for discussion sake, its a 1990 L98 Vert.
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Old Mar 30, 2008 | 10:25 PM
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Originally Posted by gvrabac
Just ran the car for a while and noticed it smoking, I thought it was maybe a leak. So I checked it out and no leak. I decided to look under the car and I noticed that the exhaust right after the small catylitic convertor? was glowing red. any ideas???????
I saw that once. It was a fricking Honda fartmobile sucked up into the radiator.
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Old Mar 30, 2008 | 10:45 PM
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did you do some work to it, have starting problems, recent flooding, or had rattling exhaust? sounds like you have a clogged cat.
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Old Mar 30, 2008 | 10:54 PM
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To be serious now, is it the exhaust pipe or the cat glowing red? Is it close to a bend in the pipe?

If it is the pipe, it may be some of the guts from the cat that has the pipe blocked.
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Old Mar 31, 2008 | 02:06 AM
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Originally Posted by gvrabac
hey guys, can you convert these cars to a real dual exhaust?
Yes, Search the forum archives, the topic been covered from A to Z...great info
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Old Mar 31, 2008 | 07:19 AM
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its right after the cat
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Old Mar 31, 2008 | 10:28 PM
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Originally Posted by gvrabac
its right after the cat
If you can get to it, try bumping the pipe and/or cat with the side of your fist and see if it rattles. If so, it is probably the cat is bad or the pipe is glogged from the bad cat.
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Old Mar 31, 2008 | 10:54 PM
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the car smells very rich, is there anything else I can check before I start replacing my exhaust?
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Old Mar 31, 2008 | 11:17 PM
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Originally Posted by gvrabac
the car smells very rich, is there anything else I can check before I start replacing my exhaust?
Now that could be the problem. If you have a 'rich' air/fuel mixture on the side that the exhaust is getting too hot, that will cause the problem. Its burning the raw fuel at the cat.

I'm not familiar with the L98 engine setup to tell you what could cause the rich mixture. Perhaps someone will chime in and answer that for you.
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Old Apr 2, 2008 | 09:29 PM
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ok guys, i checked the injectors and found 3 that are no good. now would that cause the heat in the exhaust. can the injectors get stuck open.
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Old Apr 2, 2008 | 10:07 PM
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Originally Posted by gvrabac
and for discussion sake, its a 1990 L98 Vert.
Yes
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Old Apr 2, 2008 | 10:07 PM
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Originally Posted by gvrabac
ok guys, i checked the injectors and found 3 that are no good. now would that cause the heat in the exhaust. can the injectors get stuck open.
Yes
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