how do i change the spark plugs

Asked by Jun 20, 2017 at 04:11 PM about the 2003 Mercury Grand Marquis

Question type: Maintenance & Repair

4 Answers

54,475

Get some experienced help or take it to a mechanic. You do not have the knowledge or experience to do this yourself.

82,835

Do them one at a time. Unplug the coil and then remove the coil by removing the bolt that holds it on. Remove the spark plugs and install new ones with anti-seize on the threads. Use dielectric grease on the coil boot rubber mating surfaces to seal out moisture, install coil, re-install the small bolt and plug the coil in.

82,835

Bob is right that this is a job for an experienced mechanic.

82,835

Using penetrating oil on the plugs before removing may be a good idea and can help avoid stripping the threads. Soak over night for best results.

Your Answer

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 10 nationwide Grand Marquis listings and the tools to find you a great deal.

Postal Code:

Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
    Reputation
    5,830
  • #2
    kbro
    Reputation
    2,150
  • #3
    Js08016
    Reputation
    1,900
View All

Related Models For Sale

Used Lincoln Town Car
22 listings starting at $1,850
Used Chevrolet Impala
168 Great Deals out of 1,059 listings starting at $996
Used Chevrolet Tahoe
8 Great Deals out of 748 listings starting at $3,995
Used Ford F-150
582 Great Deals out of 10,750 listings starting at $3,300
Used Ford Mustang
11 Great Deals out of 1,082 listings starting at $3,000
Used Chevrolet Camaro
863 listings starting at $12,000
Used Honda Accord
93 Great Deals out of 1,040 listings starting at $750
Used Chevrolet Silverado 1500
191 Great Deals out of 9,738 listings starting at $1,700
Used Mercedes-Benz S-Class
6 Great Deals out of 127 listings starting at $5,499

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.