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Negative Fuel Trims
I have a 2001 Chevrolet Impala 3.8 with 200,000 miles. The total fuel trim at idle will be anywhere from -12 to -25. At 2500 RPM the fuel trims are 0 to -8 It appears due to new parts that the fuel pressure regulator, MAF, and the downstream O2 sensor have bee... Login to read more. 
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47 Replies Received
47 Replies Received
| Engine | 3.8 L |
| Trans | 4-speed Automatic (Electronic) |
| Symptoms | Fuel Trim |
Vehicle Data
2001 Chevrolet Impala LS 3.8L Fuel Trim
| Engine | 3.8 L |
| Trans | 4-speed Automatic (Electronic) |
| Symptoms | Fuel Trim |
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