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.
2009 Chevrolet Impala LTZFACTORY OEM SERVICE PROCEDURE
Ignition System Specifications
| Application | Specification | |
|---|---|---|
| Metric | English | |
| Firing Order | 1-2-3-4-5-6 | |
| Spark Plug Gap | 1.02 mm | 0.040 in |
| Spark Plug Torque | 15 N.m | 11 lb ft |
| Spark Plug Type | GM P/N 12591131 AC Delco #41-100 |
|
| Spark Plug Wire Resistance | 4,060 Ξ© per meter (1,237 Ξ© per ft) | |
| Refer to Engine Mechanical Specifications | ||
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.