I have a 99 grand marquis. It ran a little rough, I thought it was missing a cylinder. Upon swapping coils i discovered one was bad and i replaced it. Now the car claims two are misfiring. Electrical?

Asked by Oct 24, 2014 at 11:48 AM about the 1999 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

The bad coil was at cylinder 5 and now 1
and 8 have misfire error codes. I can
replace them all with spark plugs for 80 but
i have a sinking feeling this wont solve the
problem.

I just purchased this car for dirt cheap
knowing i could part it out and get my
money back if need be but id like to repair it
if i can come out ahead.

1 Answer

17,800

Do a complete tune up. ALL plugs and wires, fuel filter, PCV valve and then you will know if it's a coil pack or not.

Your Answer

Add photo

Related Questions

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,150
#2 kbro
kbro
Reputation 2,040
#3 Js08016
Js08016
Reputation 1,620
View All

Related Models For Sale

Used Ford Crown Victoria
10 Great Deals out of 1,210 listings starting at $1,700
Used Lincoln Town Car
31 Great Deals out of 2,075 listings starting at $1,995
Used Chevrolet Impala
799 Great Deals out of 34,708 listings starting at $799
Used Chevrolet Tahoe
809 Great Deals out of 28,674 listings starting at $1,500
Used Ford F-150
2,884 Great Deals out of 212,656 listings starting at $1,000
Used Cadillac DeVille
5 Great Deals out of 1,976 listings starting at $1,750
Used Ford Taurus
264 Great Deals out of 20,626 listings starting at $1,500
Used Honda Accord
888 Great Deals out of 82,090 listings starting at $999
Used Ford Mustang
399 Great Deals out of 44,403 listings starting at $1,000
Used Toyota Camry
1,086 Great Deals out of 98,044 listings starting at $1,250

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
33 listings starting at $5,900
2010 Mercury Grand Marquis For Sale
5 Great Deals out of 118 listings starting at $2,999
2009 Mercury Grand Marquis For Sale
3 Great Deals out of 110 listings starting at $3,800
2008 Mercury Grand Marquis For Sale
6 Great Deals out of 167 listings starting at $2,995
2007 Mercury Grand Marquis For Sale
6 Great Deals out of 161 listings starting at $2,400