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

17,440

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

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,060
#2 kbro
kbro
Reputation 2,040
#3 Js08016
Js08016
Reputation 1,580
View All

Related Models For Sale

Used Lincoln Town Car
41 Great Deals out of 2,106 listings starting at $1,995
Used Ford Crown Victoria
6 Great Deals out of 1,395 listings starting at $1,700
Used Chevrolet Impala
953 Great Deals out of 35,423 listings starting at $1,700
Used Ford F-150
3,134 Great Deals out of 208,988 listings starting at $1,200
Used Cadillac DeVille
5 Great Deals out of 1,960 listings starting at $1,600
Used Chevrolet Tahoe
868 Great Deals out of 28,110 listings starting at $1,700
Used Buick LeSabre
12 Great Deals out of 2,261 listings starting at $1,299
Used Honda Accord
1,009 Great Deals out of 75,623 listings starting at $899
Used Toyota Camry
1,233 Great Deals out of 97,271 listings starting at $1,250
Used Chevrolet Camaro
432 Great Deals out of 40,831 listings starting at $3,500

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
44 listings starting at $7,500
2010 Mercury Grand Marquis For Sale
5 Great Deals out of 126 listings starting at $2,999
2009 Mercury Grand Marquis For Sale
4 Great Deals out of 105 listings starting at $2,995
2008 Mercury Grand Marquis For Sale
4 Great Deals out of 151 listings starting at $2,300
2007 Mercury Grand Marquis For Sale
10 Great Deals out of 163 listings starting at $1,985