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.
Ignition System Checks
To properly inspect the spark plugs or to correct a condition, refer to the following procedures:
- To properly inspect the spark plugs or to correct a condition, See IGNITION SYSTEMS in SERVICE & ADJUSTMENT SPECIFICATIONS - ION & SATURN "L" SERIES article and SPARK PLUGS under IGNITION SYSTEMS in REMOVAL & INSTALLATION - ION article.
- Remove spark plugs and inspect for correct heat range, wet plugs, cracks, wear, improper gap, burned electrodes or heavy deposits. Verify the spark plugs are of the correct type.
- Check for proper ignition voltage output using Spark Tester (J 26792).
- An improper spark plug gap will cause a driveability condition. Gap the spark plugs using a wire gauge gap tool.
- Determine the cause of the fouling before replacing the spark plugs.
- Check for damaged or misaligned spark plug boots.
- Check the Electronic Ignition (EI) module for proper ground connection.
- Monitor the Misfire Current Counters while driving the vehicle in the conditions that the symptom occurred. If a misfiring cylinder can be located, use DTC P0300 for diagnosis. See DTC P0300: ENGINE MISFIRE DETECTED under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ION article.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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