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

One cylinder bank running rich, or lean?

 
Old 07-19-2001, 12:28 AM
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My driver's side Corsa muffler is consistently darker than the passenger side one. So it seems to me that the driver's side is running richer.
Does that sound like an O2 sensor thing? What else should I look at?
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Old 07-19-2001, 12:30 AM
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Err... forgot my sig. It's a '93 LT1.

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Old 07-19-2001, 12:35 AM
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This can be caused by a few things.
1. Bad O2 sensor
2. Exhaust leak

There are more possibilities, but this is what I would lean towards.
The best way to check the O2 sensors it to switch them and see if the problem follows the O2. If it does, you found your bad one.
If not, then most likely you have a pre O2 exhaust leak.
Good Luck,

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Old 07-19-2001, 12:40 AM
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Originally Posted by 2FST4U
This can be caused by a few things.
1. Bad O2 sensor
2. Exhaust leak

There are more possibilities, but this is what I would lean towards.
The best way to check the O2 sensors it to switch them and see if the problem follows the O2. If it does, you found your bad one.
If not, then most likely you have a pre O2 exhaust leak.
Good Luck,

[/color]
If it were an exhaust leak, would I be able to see/smell exhaust from the engine compartment then? I haven't noticed any.

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Old 07-19-2001, 02:21 AM
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But if you don't have true duals, then it really tells you nothing since both sides are combined at the Y-pipe.

If you're really concerned, find one of those handheld pyrometer (or some other means of reading high temps) guns and aim at each header pipe on both banks and note the readings.

Randy

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Old 07-19-2001, 06:36 PM
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Originally Posted by KF9WM's 87 coupe
But if you don't have true duals, then it really tells you nothing since both sides are combined at the Y-pipe.

If you're really concerned, find one of those handheld pyrometer (or some other means of reading high temps) guns and aim at each header pipe on both banks and note the readings.

Randy

[/color]
It's true dual, there are no crossovers in the Corsa system. First thing I'm gonna try is the O2 sensor switch.
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Old 07-19-2001, 07:22 PM
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In order to effect the O2 readings, the leak would have to be before the O2, which means at the head or around the bung. You might even effect it a little at the collector. After the y-pipe does not really matter.

You will not necessarily smell it. Just listen for it. You should be able to hear it. It will be kinda like a ticking.
Good Luck,

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