Question about 1997 Mercury Grand Marquis

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My car has 92,000 miles and I want to change the spark plugs. I can't find what the gap setting should be. Can you tell me ? Auto Zone stores has many different priced plugs for this car. Can I successfully use any of them or is there one that is recommended? Also is there a recommended set of ignition wires that I should buy?

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If there is any recommended parts to use on your car the owners manual will tell you. As for the spark plugs when you buy them they come pre-gapped. 9.9 times out of ten you dont need to change them. if you tell someone at the auto parts store the type of car you have they will supply you with the right wires or if you are ordering them online there should be a place on the website that makes you choose your vehicle before you can order anything. Unless you are driving a rare or vintage vehicle you should be fine with anything you get from the auto parts store. If you want to check the plug gap look for a little white sticker under the hood, it will tell you your motor size and some other information.usually plug gap is at or near the bottom of this sticker.
This all should help you but let me know if you need more help.

P.S. if you have alluminum heads(most do) you will want to change your plugs when the motor is cool. this will help keep the plugs from cross-threading and causing major head damage and repair bills Good luck!!!

Posted on Dec 24, 2008

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Autozone will tell you the gap when you purchase the plugs.
Any plug will be fine. Wires are generally the same. pick the mid-priced pair for durability only. Better workmanship provides better wear and tear from the climate and temp. changes under the hood. Bosch is good quality and decently priced.

Posted on Dec 24, 2008

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