Q: How to troubleshoot a starter motor that does not turn at all when the switch is operated on Pontiac Firebird?
A: If the starter motor does not turn at all when the switch is operated, check the shift lever (automatic transmission) or clutch pedal (manual transmission). Ensure the battery is charged and all cables are secure. If the motor spins but the engine is not cranked, the starter motor may need to be disassembled. If the solenoid clicks but the motor does not operate, there may be an issue with the solenoid contacts or the motor itself. If the solenoid plunger cannot be heard, the solenoid or circuit may be defective. To check the solenoid, connect a jumper lead between the battery(+) and the S terminal. If the starter motor works, the solenoid is fine. If not, remove the starter/solenoid assembly for testing and repair. If the starter motor cranks the engine slowly, check the battery, terminal connections, and engine condition. Use a voltmeter to check the starter motor terminal while actuating the ignition switch. A reading of 9 volts or more at normal cranking speed is normal. If the reading is lower and the cranking speed is slow, the solenoid contacts may be burned.
A: To disconnect the cable from the negative battery terminal, first disable the anti-theft feature if your model has a Delco Loe II audio system. Then, raise the vehicle and secure it on jackstands. Remove the brackets supporting the starter and the two starter motor to engine bolts. Allow the starter to drop down enough to remove the nuts attaching the wires to the starter solenoid and Battery Cable, supporting the starter while removing the wires. Separate the starter from the engine and reinstall any removed shims during the installation process.