What is the spark plug gap on a 2008 Chevy Impala?
The spark plug gap for a 2008 Chevrolet Impala is typically 0.060 inches (1.5 mm) for the common 3.5-liter V6 engine. This gap is used by most models from that year. If your vehicle uses a different engine variant, verify the exact specification in the owner’s manual or GM service literature.
Engine options and how they affect spark plug gap
The 2008 Impala lineup is predominantly powered by the 3.5-liter V6, for which the factory gap is set to 0.060 inches. Some regional or specialized variants may use different plugs or settings; always confirm with official documentation for your exact VIN.
Spark plug gap specification
The recommended gap for the 2008 Impala’s spark plugs is 0.060 inches (1.5 mm). Using a different gap can lead to misfires, reduced performance, and poorer fuel economy.
How to check or set the gap
To safely check or set the gap, follow these steps. Note that many plugs used in this model are pre-gapped and are not adjustable; if you replace them with non-adjustable plugs, ensure they are already set to 0.060 inches.
- Tools you’ll need: spark plug socket, ratchet, torque wrench, and a feeler gauge (and optionally anti-seize or dielectric grease for boots).
- Safety: make sure the engine is cool, disconnect the battery, and work in a well-ventilated area.
- Remove the spark plug boot and loosen the plug with the socket; pull the plug straight out.
- Examine the plug for wear or fouling; replace if damaged.
- Check the gap with a 0.060 inch feeler gauge. For plugs that are adjustable, carefully adjust to 0.060 inches; if they are not adjustable, replace with a correctly pre-gapped plug.
- Reinstall the plug, torque to the manufacturer’s specification, reattach the boot, and repeat for all cylinders.
Concluding: Use plugs that are correct for the 2008 Impala and ensure the gap is set to 0.060 inches. If in doubt, consult the service manual or a professional mechanic.
Common questions and practical tips
For most stock vehicles, deviating from the 0.060-inch specification is not recommended. If you are chasing performance or using high-octane fuel, discuss options with a qualified technician.
Summary
In summary, the standard spark plug gap for a 2008 Chevrolet Impala (with the typical 3.5L V6 engine) is 0.060 inches (1.5 mm). When replacing plugs, use ones pre-gapped to this value, verify with a gauge, and torque to the manufacturer’s specification. Always refer to the owner's manual or service bulletin for any engine-specific exceptions.
