This is more of an informational post for anyone wishing to replace their spark plugs on this particular engine. I'm a bit of a novice when it comes to working on cars, but I've been slowly learning how to fix and replace parts on the G6 just for my own personal satisfaction (and to save a little money too).
My car currently has 193,000 miles on it and I have never changed out the spark plugs until today. I know I was suppose to get it done around the 100k mark, but I just never got around to it. Well, my car has started to run fairly rough lately and I noticed the RPMs starting to dip a little while driving. I figured I had better do something about it.
My engine has 3 plugs in the front, and the infamous 3 in the back of the engine (near the firewall). Here are the tools that I used to complete this job in 2 1/2 hours:
GearWrench 80546 5/8-Inch x 6-Inch Swivel Spark Plug Socket
This swivel socket is totally worth the $14 I paid for it. This socket, along with the next tool I'm about to mention, made this job possible for me. It comes with a magnet to hold the spark plug in place and is handy for hand threading the spark plug into the channel before attaching a ratchet. I also had to use a Stanley 3" extension bar (3/8) to assist with the back plugs.
Lisle 51250 Spark Plug Wire Puller
I attempted to remove the rubber boots from the spark plugs last weekend by hand and they would not budge no matter how much I twisted and turned them. I almost gave up after this but I thought I would try one more time. I ordered the Lisle spark plug wire puller from Amazon and it easily exceeded my expectations. I was able to pull the front wires loose in seconds
with this tool. Just put the hook opening on the rubber boot and slide it down the channel and you will feel when it makes contact with the plug. At that point, all you have to do is pull straight out and you're done. The tool cost less than $10 and made this entire job possible.
The ratchet I used was a 10" (3/8) Williams ratchet. The back plugs are accessible with this size ratchet, but you may want to go with a size that is a few inches longer for better clearance of the wiper cowl. I used a 3" extension in addition to the swivel tool I mentioned earlier.
I replaced my spark plug wires with new ones from Bosch as well as OEM iridium spark plugs from AC Delco (#41-101). I also bought small packs of anti-seize and dielectric grease.
A note on the removal of the rear wires and plugs
Removing the plugs and wires from the back of the engine is the toughest part, but the wire puller makes this a whole lot easier. You have to pretty much do everything by feel since you can't see back there. I would recommend not using gloves so you know what you are touching. I also unplugged the #1 and #4 wires from the coil pack to gain easier access.
GM actually puts 2
of those plastic spark plug wire clips on the backside
of the engine. I thought this was pretty sadistic. I was able to remove one with a flathead screwdriver, but I couldn't contort my body to remove the other one. I ended up cutting the spark plug wires (I was replacing them anyway) to pull them out. Those back clips are something that I haven't seen anyone mention anywhere online. I would recommend putting at least one clip back on to keep the wires secured.
I can't say enough good things about the wire puller. I was able to work on the backside of the engine by leaning over the passenger side of the vehicle. I didn't have to lay on top of the engine to remove the plugs like I saw someone mention online.
Also, I had to remove the engine cover to pry open one of the plastic spark plug wire clips. This was simple enough. Just remove the oil cap and pull the cover up. Place the oil cap back on while you work.
Thanks for reading and hopefully this helps someone.