Mercury Grand Marquis Problem Report

Mercury Grand Marquis Misfire due to failed spark plugs or ignition coil

(9 reports)

Bad spark plugs or an ignition coil can cause ignition misfire, which will illuminate the Check Engine Light.

one morning the check engine light went on and the car rode rough. I figured bad gas or fuel filter. 2 miles on the check engine light started blinking. Call to mechanic told me to get the car to him ASAP. Drove 6 miles home going 10mph on the shoulder, praying all the way. Bad ignition coil. He replaced all the plugs. Got off cheap, could have been catalytic converter or worse. Otherwise great highway car. -
Had a stalling problem, that went away, now it chugs and has a misfire, plus gas caused the stalling when I went back to regular it didn't stall, P0304 cylinder 4 misfire. -
Had Crack Intake but Replace; Also put new spark Plugs and #4 and #2 coil packs in. but still having skipping issues -
engine (chugs)misses at times new plugs / fuel filter have not helped -
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Buy if I get it on hwy speed it seems to run ok

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