Misfire in spark plugs in 2004 Grand Marquis

Asked by BigBodyLover Nov 04, 2018 at 01:51 PM about the 2004 Mercury Grand Marquis

Question type: Maintenance & Repair

I have a misfire in plug #8. (Per AutoZone) what
does this mean? And do I need to replace all?

2 Answers
13,440

Karmon answered 5 years ago

check the coil, if its a coil-over-plug set up. as a rule replace all spark plugs at the same time

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GuruPF98B answered 4 years ago

i had a #8 only misfire, replaced the plug, plug wire, coil, & injector and checked vacuum(steady and 24" mercury. have not checked compression on that cylinder, what have i missed? mercury grand marquis 4.6 liter engine. thanks

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