Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2000 Pontiac Firefly (CANADA) L4-1.3LFACTORY OEM SERVICE PROCEDURE
Short Term FT-2
The scan tool display is counts. The Short Term Fuel Trim (FT) represents a short term correction to the PCM controlled fuel delivery. The Short Term FT correction is driven by the fuel control oxygen sensor. When the oxygen sensor voltage remains below 450 mV the PCM adds fuel and the Short Term FT parameter is greater than 128. When the oxygen sensor voltage stays above 450 mV the PCM subtracts fuel and the Short Term FT parameter is less than 128. During an extended idle with high ambient temperatures, the EVAP canister may purge, causing the Short Term FT to read less than 128. This is a normal condition. The fuel trim values at maximum authority may indicate an excessively rich or lean condition.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.