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.

SYS.OK|MANUAL.DB● LIVE

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

2001 Chevrolet Suburban C1500

Excessive Smoke

2001 Chevrolet Suburban C1500SECTION Excessive Smoke

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.

Excessive Smoke

Checks	Action
DEFINITION: White, black, gray or blue smoke under load, idle or start up hot or cold.
Preliminary Check	Refer to Symptoms - Engine Controls . Make sure the customer has an actual problem. Check the fuel quality.
Fuel System Checks	Check the injection pump. Check the injection pump timing. Refer to Fuel Injection Pump Timing Adjustment . Check the injection nozzles. Refer to Fuel Injection Nozzle Diagnosis .
Sensor Check	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. Check the glow plug system operation. Refer to Glow Plug System Diagnosis .
Air Intake System Check	Check the air cleaner and the air intake ducts for restriction. Check for a restriction in the turbocharger inlet duct. Check for a restriction in the intake manifold.
Engine Mechanical Check	Check for incorrect basic engine parts such as the cam, the heads, the pistons, etc. Check for excessive oil entering the combustion chamber.

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

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.