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Re: 2002 chevy van with 5.7L. both banks lean
Disconnect the MAF sensor and reset the Fuel Trims using the Scan tool. repaeat the road test without the MAF and see what the Fuel trims do. By Default all GM's will default to speed density without at MAF siganl. This will help you eliminate a squewed MAF re... Login to read more. 
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| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2002 Chevrolet Express 1500 5.7L
| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
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