LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

any idea what would cause bank 1 lean and bank 2 rich?

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Old 02-02-2007, 11:38 AM
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any idea what would cause bank 1 lean and bank 2 rich?

well my car's been running like *** lately, so I decided to change the plugs last night. The car runs way better now, but I noticed that there is a lightshow at the coil. Im running a new opti, MSD wires, and Tr55 plat's@.045 the car idles on its own very smooth with out any pedal assistance.

I pulled the driver side plugs first and they were all whitish to tan, which is pretty good, but all the pass. side plugs were black. last time i datalogged the car it said the driverside was extrmely lean and pass extremely rich. what might cause this? Im still on stock injectors/fuel system which are maxxed out, and im on a mailorder tune. Cant figure this damn thing out, any ideas?
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Old 02-02-2007, 11:49 AM
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Do you have headers? They may be leaking at the O2 sensor making the car think its lean. Also what throttle body do you have? If not a stock one, the bypass air circuit is different.
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Old 02-02-2007, 12:19 PM
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I have PS longtubes, but there is a really smalll leak at the collector. but its like a small pinhole, i dont think it would affect anything. I do have a BBK 52mm tb but I've never had any problems with it since i bought the car 3 years ago. im getting tired of this car, makes me want to run it into a ditch and burn it...j/k! but its pissing me off. any other ideas?
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Old 02-02-2007, 10:29 PM
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Are your BLM's split?
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