2004 Gramd Mercury Marquis


Asked by Jul 08, 2016 at 08:43 PM about the 2004 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

I was on a short drive to local market and
car was running fine, after stopping for a
light the engine sounded like I was driving
on a flat tire.  Very loud knocking and engine
light started blinking.  Help

3 Answers


A flashing check engine light means that the engine is misfiring and damaging the catalytic converter. If you have over 90,000 miles on your Grand Marquis you're due for a tune up. I'd start there. HTH. -Jim

1 of 1 people found this helpful.

Thank you, Hoping that be the problem, for the engine to go from a purring to loud in a matter of minutes is alarming. I found a friend who has a mechanic cousitowho will have a look this weekend is somewhat a relief. Still a little unsettling since money is tight at the moment. Thank you again.

1 of 1 people found this helpful.

You're welcome. Glad to help. -Jim

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