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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 143 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)EMISSION SYSTEMS & SUB-SYSTEMS (DIESEL)EXHAUST GAS RECIRCULATIONEXHAUST GAS RECIRCULATION SYSTEM CLEANING
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Exhaust Gas Recirculation System Cleaning
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Exhaust Gas Recirculation System Cleaning
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
- Remove Exhaust Gas Recirculation (EGR) valve.
- Depress pintle several times using a pencil eraser or other suitable soft instrument. Pintle should move in and out smoothly. Replace valve if valve exhibits tendencies to stick.
- Try to rotate EGR valve electrical connector housing. Repeat for coil housing. Replace valve if valve exhibits any looseness. Inspect EGR valve pintle and seat for deposits. Use a cloth or other suitable soft device to remove deposits. Remove all loose particles. Replace valve if deposits are such that pintle-to-base interface cannot be cleaned adequately to allow pintle to seal against seat. Damage to powdered metal EGR valve base occurs if cleaned with solvents, sharp tools, wire brush or wheel, or sand blasting. Cleaning by these methods is not recommended.
- Clean passages with a wire brush. Remove all loose particles.
- Install EGR valve.
CAUTION:
Avoid breathing fumes and swallowing EGR exhaust deposits when removing components for cleaning as bodily injury may result.
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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.