General Motors — Spark Plug Replacement
Maintenance · Spark Plugs
From a General Motors service manual — check it applies to your exact model before use.
Before you start
- Do not install plugs hotter or colder than the heat range specified
- Be sure plug threads smoothly into cylinder head and is fully seated
- Do not pull on the spark plug wire; pull on the boot only
Procedure
- Allow the engine to cool before removing the spark plugs
- Clean the spark plug recess area before removing the plug
- Turn OFF the ignition switch
- Remove the spark plug wires using a twisting motion to release the boot from the spark plug
- Remove the spark plugs using the J 39358
- Inspect each plug for wear and gap
- Install the spark plugs; tighten to 15 N·m (11 lb ft)
- Install the spark plug wires in their original locations
Tools required
- J 39358 Spark Plug Socket Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spark Plugs: 15 N·m (11 lb ft)
Source: General Motors service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.