Grand Marquis cylinder 6 misfire at idle
15

Asked by Guru94FHRB Sep 23, 2020 at 03:24 PM about the 2004 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

I've had a cylinder 6 misfire for a while. Only happens at idle and when the
vehicle has warmed up. The check engine light flashes but goes away when
I accelerate. Things I've replaced recently include:

   -All spark plugs (all wells were dry - no leaks)
   -All coil packs
   -Fuel injector on cylinder 6
   -Left valve cover gasket
   -IAC valve
   -MAF sensor
   -TPS sensor

Any ideas?

3 Answers
15

Guru94FHRB answered 4 years ago

I actually ordered the crank sensor and cam sensor and they should be here in a few days.

Mark helpful
15

Guru94FHRB answered 3 years ago

If anyone's seeing this in the future, the solution was to replace all fuel injectors. Not sure which one caused the issue, but after replacing all 8, the symptoms and CEL went away.

1 people found this helpful.
Mark helpful

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