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 DIAGNOSISENGINE PERFORMANCEREMOVE, OVERHAUL & INSTALLENGINE CONTROLS - REMOVAL & INSTALLATIONIGNITION SYSTEMSIGNITION COILSREMOVAL (5.3L)
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Removal (5.3L)
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal (5.3L)
CAUTION:
This component is initially installed using a self-tapping bolt(s). Care should be taken when removing and/or installing the self-tapping bolt(s). Failure to use care when removing and/or installing the self-tapping bolt(s) can lead to damage and unnecessary replacement of the self-tapping bolt(s) and/or the component the self-tapping bolt(s) is threaded into.
- Turn ignition off. Remove spark plug wire(s) from appropriate ignition coil(s). Twist the spark plug boot 1/2 turn. Pull only on the boot in order to remove the wire from the ignition coil.
- Disconnect harness connector(s) from appropriate ignition coil(s). Remove retaining bolts from appropriate ignition coil(s). Remove ignition coil(s) from engine.
RENDER: 1.0x
NO RELATED
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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.