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WALKER® EXHAUST SYSTEMS: Fuel Trim – AFR (Air / Fuel Ratio)
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WALKER® EXHAUST SYSTEMS: Fuel Trim – AFR (Air / Fuel Ratio)
The PCM attempts to maintain AFR of 14.7 : 1, using data it receives from the vehicle's sensors, primarily the MAF and O2 Sensors.
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  • Short-term fuel trim is based on readings from the current engine operating conditions. Long-term fuel trim averages several of the short-term readings to affect the fuel base mapping.
  • Any fuel trim reading greater than 5% indicates a problem that requires checking cylinder balance, and / or checking with a five-gas analyzer.
  • Remember, fuel trim is just one of several systems that affect emissions. The fuel trim may be correct, yet the engine may still be producing excessive emissions.
WALKER® EXHAUST SYSTEMS: Fuel Trim – AFR (Air / Fuel Ratio)