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
ISC Motor Replacement
REMOVAL PROCEDURE
NOTE: Check the throttle lever screw and the throttle stop screw for evidence of tampering before replacing the ISC motor. Perform the following 2 inspections:
^ Open the throttle lever to the full open position. Check that the yellow paint has not come off of the throttle lever screw.
^ Turn the resin cap of the throttle stop screw on the throttle body side with your fingers. Check the entire cap for damage.
Do not replace the ISC motor if any yellow paint has come off the throttle lever screw or if the resin cap is damaged. Replace the throttle body assembly as a unit.
1. Let the engine cool to the ambient air temperature.
2. Remove the air cleaner.
3. Disconnect the Idle Speed Control (ISC) motor electrical connector (2).
4. Remove the three screws (1) and the ISC motor from the Throttle Body Fuel Injection (TBI) unit.
INSTALLATION PROCEDURE
NOTE:
^ Do not supply electrical power to the ISC motor terminals before installation in order to avoid damage to the ISC motor.
^ Refer to Fastener Notice in Service Precautions.
1. Install the ISC motor to the TBI unit with the three screws (1).
Tighten
Tighten the ISC motor screws to 2.8 to 4.0 N.m (24 to 36 lb in).
2. Connect the ISC motor electrical connector (2).
3. Install the air cleaner.
4. Start the engine.
5. Run the engine to normal operating temperature and check that the idle speed is within the specified idle range. Refer to Idle Speed Inspection.
NOTE: Check the throttle lever screw and the throttle stop screw for evidence of tampering before replacing the ISC motor. Perform the following 2 inspections:
^ Open the throttle lever to the full open position. Check that the yellow paint has not come off of the throttle lever screw.
^ Turn the resin cap of the throttle stop screw on the throttle body side with your fingers. Check the entire cap for damage.
Do not replace the ISC motor if any yellow paint has come off the throttle lever screw or if the resin cap is damaged. Replace the throttle body assembly as a unit.
1. Let the engine cool to the ambient air temperature.
2. Remove the air cleaner.
3. Disconnect the Idle Speed Control (ISC) motor electrical connector (2).
4. Remove the three screws (1) and the ISC motor from the Throttle Body Fuel Injection (TBI) unit.
INSTALLATION PROCEDURE
NOTE:
^ Do not supply electrical power to the ISC motor terminals before installation in order to avoid damage to the ISC motor.
^ Refer to Fastener Notice in Service Precautions.
1. Install the ISC motor to the TBI unit with the three screws (1).
Tighten
Tighten the ISC motor screws to 2.8 to 4.0 N.m (24 to 36 lb in).
2. Connect the ISC motor electrical connector (2).
3. Install the air cleaner.
4. Start the engine.
5. Run the engine to normal operating temperature and check that the idle speed is within the specified idle range. Refer to Idle Speed Inspection.
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.