- Fuel system: Double check the fuel pressure to ensure it is within specifications. If the fuel pressure is inadequate, the fuel injectors may not be able to deliver enough fuel to the engine. Also check the fuel injectors for proper operation and ensure there are no blockages or leaks in the fuel lines.
- Ignition system: Make sure the spark is strong and consistent. There should be a spark at all of the spark plug wires. Check the spark plugs for wear or damage and replace if necessary. Also check the distributor cap and rotor (if applicable) and ensure they are in good condition.
- Air Intake system: Check for vacuum leaks. You can do this by spraying a small amount of starting fluid around the base of the throttle body and intake manifold while the engine is cranking. If there are any leaks the engine will run briefly when you spray the starter fluid.
- Engine Mechanical Problems: Check the engine compression to ensure the cylinders are still in good condition. Low compression can cause the engine to fail to start or run rough. Also check for any abnormal engine noises, such as knocking, grinding, or popping. These could indicate internal engine damage.
- Starter: Confirm the starter motor is functioning properly and engages with the flywheel. Inspect the starter solenoid and ensure it is operational.
- Battery: Ensure the battery has sufficient voltage and is able to provide enough current for starting the engine.
- Anti-Theft System: Some Grand Ams are equipped with an anti-theft system called PASS-Key, which consists of a transponder in the key and a receiver module near the ignition switch. If the key doesn't have the correct chip or there's a problem with the receiver, the car won't start.
