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) L3-1.0LFACTORY OEM SERVICE PROCEDURE
Using A Scan Tool
1. Remove the air cleaner (if necessary).
2. Insert a 3.5 mm (0.14 inch) feeler gage (2) between the throttle stop screw (1) and the throttle lever (3).
3. Inspect the ISO motor plunger. If the ISO motor plunger (1) is contacting the throttle lever screw (3), then the engine must be brought to operating temperature. There must be no contact (2) between the ISC motor plunger and the throttle lever screw.
4. Turn ON the ignition.
5. Observe the TP sensor voltage on the scan tool. The TP sensor voltage reading should be 0.98 to 1.02 volts.
6. If the TP sensor voltage IS NOT 0.98 to 1.02 volts, loosen the TP sensor screws (1) and turn the TP sensor until the voltage reading is 0.98 to 1.02 volts.
NOTE: Refer to Fastener Notice in Service Precautions.
7. Tighten the TP sensor screws (1).
Tighten
Tighten the TP sensor screws to 2.0 N.m (18 lb in).
8. Replace the TP sensor if a TP sensor voltage reading of 0.98 to 1.02 volts cannot be obtained.
9. Install the air cleaner.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.