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What can make an engine run rich but the ECM detects lean
Got a strange one here that I hope someone can help with, it
is setting bank 1 & 2 lean codes that appear to be false. 
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| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
1998 Chevrolet Express 3500 5.7L
| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
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