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Spark Plugs and Wires
Pontiac Grand Prix
Grand Prix LE
Grand Prix SE

How do you change the back three spark plugs on a 1990 Grand Prix?

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2015-07-15 18:34:47
2015-07-15 18:34:47

If it has a 3.1 remove the alternator and you will have easy access to them.

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.

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You will three plugs different from the forth plug

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they are three in front and three in back just below the valve covers 5/8 wrench should fit them. unscrew them out and replace with new ones and your done. would be a good time to change plug wires also

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Then you'll have three good spark plugs and three bad spark plugs. Not a good combination. I suppose you want to know if it will hurt anything though. The answer is no but if the three old plugs are shot it won't run very good.

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you need to take the intake off to get to the back three plugs...


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