GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2000 🢒 Sunfire 🢒 Engine 🢒 Engine Controls - 2.2L 🢒 Hard Start

Hard Start

Checks

Action

DEFINITION: Engine cranks OK, but does not start for a long time. The engine does eventually run, or may start but immediately dies.

Preliminary
    • Check to see if the driver is using the correct starting procedure as described in the owner's manual.
    • Refer to Symptoms .
    • Search for service bulletins.

Sensor/System
    • Check the engine coolant temperature (ECT) sensor for being shifted in value. Install a scan tool and compare the engine coolant temperature with the intake air temperature (IAT) on a cold engine. The ECT and IAT should be within ± 3°C (5°F) of each other. Check the resistance of the ECT sensor if the temperature is out of range with the IAT sensor. Refer to Temperature Versus Resistance . If the ECT sensor resistance is not within the specification, refer to DTC P0117 Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage or DTC P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage .
    • Check for proper operation of the MAP sensor . Refer to Manifold Absolute Pressure Sensor Output Diagnosis .
    • Check for proper operation of the TP sensor.
    • Check for proper operation of the IAC valve.

Fuel System
    • Check for adequate fuel level.
    • Check the fuel pump relay circuit for proper operation. Refer to Fuel Pump Electrical Circuit Diagnosis .
    • Check for incorrect fuel pressure. Refer to Fuel System Diagnosis .
    • Check the fuel injectors.
       - Refer to Fuel Injector Balance Test .
    • Check for fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
    • Check the in-tank fuel pump check valve. The in-tank fuel pump check valve may be malfunctioning, causing the fuel in the lines to drain back into the fuel tank after the engine is stopped.
        Refer to Fuel System Diagnosis .

Ignition System
    • Check for proper ignition voltage output with the J 26792 spark tester or equivalent.
    • Check the spark plugs for the following conditions:
       - Wet or fuel-fouled spark plugs
       - Cracks on the spark plugs
       - Wear
       - Improper spark plug gap
       - Burned electrodes or heavy deposits
    • If the spark plugs are fuel or oil-fouled, the cause of the fouling must be determined before replacing the spark plugs.
    • Check the ignition control module (ICM) for proper ground connection.
    • Check the ignition coils for cracks or carbon tracking.
    • Check the spark plug wires for proper resistance and condition.

Engine Mechanical
    • Check the engine for the following engine mechanical problems:
       - Low compression
       - A leaking cylinder head gasket
       - A worn or an incorrect camshaft
    • Refer to Base Engine Misfire Diagnosis in Engine Mechanical.

Additional Checks

If all procedures have been completed and no malfunctions have been found, review and inspect the following items:

    • Visually and physically inspect all electrical connections within the suspected circuit and/or systems.
    • Check the scan tool data.