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That's most likely a bad spark plug. It's best to replace all along with the wires too. About a $300 job at a good repair shop.
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∙ 13y ago
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Where is the fuse box on a 1991 mercury grand marquis?
the fuse box on a 1991 ford grand marquis is located right under the steering wheel
Will a door off a 1991 gs grand marquis fit onto a 1992 ls grand marquis?
No,they won't fit.
Which octane do you use for a 1991 mercury grand marquis?
For a 1991 Mercury Grand Marquis : " regular " unleaded gasoline , 87 octane is used for both the 5.0 and 5.8
How do you install a fuel pump on a 1991 Mercury Grand Marquis?
It's in the tank.
Why cant you put any 5.0 engine in your 1991 mercury grand marque?
Why cant you put any 5.0 engine in your 1991 mercury grand marquis
Can a grill from a 1987 grand marquis fit on a 1991 grand marquis?
NO a grill from a 87 will not fit a 91. Only a grill from 88 , 89 or a 90 will fit. They don't even look the same.
What type of Freon do you use in a 1991 Grand Marquis?
Was built for R12, should be converted to R134a
Where is the automatic fuel shut off switch located in a 1991 Mercury Grand Marquis?
its in the trunk
What is the gas mileage of the 1991 grand marquis?
it gets 15 mpg's in city.....22 on Highway
Spark gap 1991 grand marquis 5.0 liter?
.050 inch , according to fordparts.com
What is the firing order for a 1991 grand marquis 4.6 liter?
As far as I know , the 1991 Mercury Grand Marquis either had the 5.0 litre / 302 cubic inch V8 or the 5.8 litre / 351 cubic inch V8 engine . The 4.6 litre Single Over Head Cam ( SOHC ) engine was used in the Mercury Grand Marquis starting with the 1992 model year Firing order of the 5.0L which is the engine installed in the 1991 Mercury Grand Marquis is 1-5-4-2-6-3-7-8 rotor turns counterclockwise.
What would make antifreeze come out of the defrost area on a 1991 mercury grand marquis?
Heater core leaking.
