GM Service Manual Online
For 1990-2009 cars only

Checks

Action

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

Preliminary Checks

    â€¢ Refer to Important Preliminary Checks.
    â€¢ Make sure the driver is using the correct starting procedure.

Sensor Checks

    â€¢ Check the Engine Coolant Temperature (ECT) sensor using the scan tool to compare the engine coolant temperature with the ambient air temperature on a cold engine. If the coolant temperature reading is more than 5° greater or less than the ambient air temperature on a cold engine, check for a high resistance in the coolant sensor circuit or the sensor itself.

Fuel System Checks

    â€¢ Check the Supply to injection pump. Refer to Fuel Systems.
    â€¢ Check for air in fuel system. Refer to Fuel Systems.
    â€¢ Check the fuel return from injection pump. Refer to Fuel Systems.
    â€¢ engine shut-off solenoid operation. Refer to Control Module Systems.
    â€¢ Check the fuel injection nozzles. Refer to Fuel Systems.
    â€¢ Check the fuel tank cap vent.
    â€¢ Check for an internal injection pump problem. Refer to Fuel Systems.

Electrical System Checks

    â€¢ Check glow plug operation. Refer to Section 7.
    â€¢ Check for slow cranking speed.

Air Intake System Checks

    â€¢ Check the air cleaner and air intake ducts for a restriction.
    â€¢ Check for a restriction in turbo charger inlet duct.
    â€¢ Check for a restriction in the intake manifold.

Exhaust System Check'

    â€¢ Check the exhaust system for possible restriction. Refer to Control Module Systems.

Engine Mechanical Checks

    â€¢ Check the engine for the following:
       - Improper valve timing
       - Low compression
       - Bent pushrods
       - Worn rocker arms
       - Broken or weak valve springs
       - Worn camshaft lobes

Additional Checks

    â€¢ Check for no crank signal. Refer to Control Module Systems.
    â€¢ Check the Service Bulletins for control module software updates.