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.
Spark Plug: Installation
Properly position each spark plug washer. Inspect each spark plug gap. Adjust each plug as needed. See SPARK PLUGS under IGNITION SYSTEMS in SERVICE & ADJUSTMENT SPECIFICATIONS - 4.3L ASTRO, BLAZER, CHEVY EXPRESS, SAFARI, SAVANA, SIERRA, SILVERADO, SONOMA & S10 PICKUP article. Hand start the spark plugs in the corresponding cylinders. Tighten the spark plugs to specification. See TORQUE SPECIFICATIONS .
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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.