What is the removal method for the three rear spark plugs of the Buick GL8?
3 Answers
The removal method for the three rear spark plugs of the Buick GL8 is as follows: 1. Use a screwdriver to remove the engine cover; 2. Clean the dust and oil stains from the high-voltage wire terminals; 3. Use a socket wrench to loosen the fixing screws of the high-voltage wire terminals; 4. Use a socket wrench to loosen the spark plugs; 5. Insert the soft tube from the high-voltage wire terminal into the combustion chamber; 6. Pull out and remove the spark plugs. Taking the 2021 Buick GL8 as an example, its body dimensions are: length 5238mm, width 1878mm, height 1776mm, wheelbase 3088mm, fuel tank capacity 66L, and trunk capacity 475L. The 2021 Buick GL8 is equipped with a 2.0T turbocharged engine, with a maximum horsepower of 237PS, maximum torque of 350Nm, maximum power of 174kW, and is paired with a 9-speed automatic transmission.
I often change the three rear spark plugs on my GL8 myself, but those positions are tricky and require the right tools and methods. The engine must be completely cooled—wait at least an hour before starting, or the high temperature could cause burns or damage the threads. Once you locate the spark plugs, the rear three are often blocked by the exhaust pipe or firewall, so you might need to temporarily move the air filter tubing or heat shield to create space. I use a long-handled 16mm spark plug socket, slowly turning counterclockwise to remove them—gentle movements are key to avoid snapping the plug in the cylinder. After removal, check the threads for damage. Before installing new spark plugs, apply anti-seize or thread locker, hand-tighten them, then add half a turn to ensure a proper seal. Doing it myself saves about 200 yuan each time, and replacing them every 20,000–40,000 km improves fuel efficiency and horsepower while preventing misfires that cause engine shake or high fuel consumption. The whole process takes less than half an hour, and once you're familiar, it becomes second nature.
The first time I removed the rear spark plugs on my GL8, I was a bit nervous, especially those three inner ones which were super hard to reach. For tools, I opted for a rented socket wrench set from the auto repair shop—cheap and hassle-free. The steps are straightforward: with the engine cold, unplug the ignition coil connectors carefully to avoid breaking the wires, then loosen them by turning counterclockwise a few times with the wrench—don't rush, or you might strip the threads. Hand-tighten the new spark plugs; no need for excessive force. Last time, I followed a YouTube tutorial step by step. Though it took more time, it saved me money. DIY also helps prevent ignition issues, like engine hesitation during startup caused by worn spark plugs. Beginners should wear gloves to keep clean and consider having a friend assist for added safety and peace of mind.
