Depends on which size plug you are using. Hint, keep changing sockets until you find the one that fits. They are not metric.
There are three sizes of plug in normal use, 10mm, 14mm and 18mm. (They are identified by their thread size) The socket sizes for these are 5/8" (16mm) 13/16" (21mm) and 15/16" (24mm). However, many 14mm plugs (the most common size) have 5/8 hexagons, and many 18mm plugs have 13/16 hexagons!
You will need to remove the spark plug wires on your Chevrolet 3.1 liter engine. Remove the spark plugs with a 5/8 deep well socket. Turn the socket to the left. The spark plugs will come out. Reverse the process to install the new spark plugs.
16mm
To replace spark plugs, you can use a socket wrench, but a socket made for removing and replacing spark plugs is needed. This socket is relatively inexpensive and can be found at most auto parts stores.
Replacing the plugs is fairly easy. Just remove the plastic engine cover then unbolt and remove the 4 coils. Once removed you need to look down and you will see the plugs that need to be removed with a spark plug socket.
Remove the plastic cover on top of the camshaft cover (the cover reads VOLVO 24 VALVE. You will need a Torx 24 to remove the fasteners and a 10mm socket to remove the coils above the spark plugs.
Plugs are on either rocker cover....there are 3 ign coils on each rocker cover that need to be removed then remove the plugs You will need a 5/8 spark plug socket as well as a long extension to replace them 8mm socket holds the individual coils on
if your engine is a 2.4l twin cam you need to remove the top covers. then underneath there are individual coil packs secured by 10mm spanner bolts. remove them and pull the coil out. the spark plugs are there and need a slim size plug socket....
pull the plug wires and you need a deep well socket i believe its 5/8
You do not need to remove the fuel rail to remove the spark plugs.
The spark plugs are located straight down through the valve cover, at the end of the spark plug wire. 5/8 inch socket to remove them, you will also need an extention and it is a good idia to tape the socket and extention together or the socket will get stuck down in the valve cover, hope this helps
Remove cover on top of engine,pull plug wires straight up.The spark plugs will be down in a hole for each cylinder.You need a spark plug socket and a long extention to reach them.
Remove the plastic cover that is to the oil filler cap, it will a torx bit. Be careful when removing the Spark plug wires the coils are connected to them and they arre bolted down. You will need a 8" extension to get the plugs out, I think you will need a 5/8 spark plug socket. Remove old plugs. gap new plugs and install in reverse as removing them.