Feb 18 • General discussion
Fuel Trims
Positive fuel trim = ECU adding fuel → lean condition.
Negative fuel trim = ECU removing fuel → rich condition.
But don’t stop there.
Check:
• Idle vs load
• Short-term vs long-term
• O₂ switching speed
• Maf sensor readings
• Coolant temp sensor readings
Pattern > single number.
There’s always a reason for erratic readings.
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Fuel Trims
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