Spark Plugs and Wires
Grand Prix LE

How do you change the back 3 spark plugs on a 1997 Pontiac Grand Prix?

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2015-07-15 18:44:28
2015-07-15 18:44:28

undo motor mount in front and put jack under engine and gently lower engine until you can see back plugs

Well, if you want to make it harder on yourself, you can change them the way I did on my 98 Grand Prix. Don't mess with motor mounts and just try to reach back there using a mirror and skinny hands to pull wire off, untighten, replace, retighten, wire back on, and lose 2-3 tools in the engine compartment that never fell through to the ground. It was fun!!

Make sure the car wheels are chocked. Be on level ground. Make sure the transmission is in Park. Remove the forward most bolts in each of the two motor mounts in front of the engine. Have someone help you push the car forward and the engine will move away from the firewall as you do this. once you get the car forwrd enough make sure you have the wheels chocked again so the car can't roll backwards. You will see an "eye" on the bottom of the motor mount that you can stick the bolt back trough once you get the engine rocked forward enough. Once you get the bolt in the eye you will have plenty of room to get down behind the engine. You can go further if you don't want to use the bolt through the eye. Just push the car forwrd even more and chock the wheels again. You will want to make sure that whatever you have securing the wheels will not come out. You wouldn't want it to happen and get you arm pinned in between the firewall and the engine.

Just changed spark plugs on my 98 Grand Prix with 3.8L V-6. Was able to get to back spark plugs without moving engine, although you may skin some knuckles--my hands and arms are not skinny. The hardest part was removing the old wires--twist the boot first to break them free from the spark plug before trying to remove them. I also replaced the wires as a precaution and since I found some cracks at the wire-to-boot base. You will need a ratchet with a flex head and a short extension between the ratchet and spark plug socket to ease removal. Using dielectric grease on the boot before installing it on the new plugs should ease removal of the wire in the future if you need to.

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