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.

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HOMESERVICE MANUALSCHEVROLET2001SUBURBAN C1500REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 15 (ENGINE CONTROLS - 6.5L - TROUBLESHOOTING)HARD START

2001 Chevrolet Suburban C1500

Hard Start

2001 Chevrolet Suburban C1500SECTION Hard Start

WARNING: This page is about a different car, the 2001 GMC C3500 HD and 2001 Chevrolet C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Hard Start

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	Refer to Symptoms - Engine Controls . Make sure the driver is using the correct starting procedure.
Sensor Checks	Check the engine coolant temperature (ECT) sensor. Use the scan tool in order to compare the engine coolant temperature with the ambient air temperature on a cold engine. If the coolant temperature reading is more than 5 degrees more or less than the ambient air temperature on a cold engine, check for a high resistance in the coolant sensor circuit or the coolant sensor.
Fuel System Checks	Check the supply to injection pump. Refer to Fuel System Diagnosis . Check for air in the fuel system. Check the fuel return from the injection pump. Check for engine shut-off solenoid operation. Check the fuel injection nozzles. Check the fuel tank cap vent. Check for an internal injection pump problem.
Electrical System Checks	Check glow plug operation. Refer to Glow Plug System Diagnosis . Check for slow cranking speed.
Air Intake System Checks	Check the air cleaner and air intake ducts for a restriction. Check for a restriction in turbo charger inlet duct. Check for a restriction in the intake manifold.
Exhaust System Check	Check the exhaust system for possible restriction. Refer to Restricted Exhaust in Engine Exhaust.
Engine Mechanical Checks	Check the engine for the following: Improper valve timing Bent pushrods Worn rocker arms Low compression. Refer to Engine Compression Test in Engine Mechanical. Broken or weak valve springs Worn camshaft lobes
Additional Checks	Check for no crank signal. Check the Service Bulletins for control module software updates.

RENDER: 1.0x

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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.