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Answered 2013-01-22 14:50:22

I'm not sure if the 1986 is the same as the 1987 , but

( on the 1987 Mercury Grand Marquis the 5.0 liter / 302 cubic inch V8 engine

is rated at 150 horsepower and the 5.8 liter / 351 cubic inch V8 engine is

rated at 180 horsepower according to my Chilton's Auto Repair Manual )

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The Mercury Grand Marquis is a nice big car, especially those from 1986, very roomy for those who are tall, with long legs. The original tires size for this vehicle is 215/70-15. There is no other size suggestions for this vehicle.


According to my Chilton's Auto Repair Manual : The ( 1987 ) Mercury Grand Marquis holds ( 20 U.S. gallons )


firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Mercury Grand Marquis


The 1986 Mercury Marquis does not have a fuel cutoff switch. The fuel pump does have a fuse, of which could render it as nonworking.


Wheels from a concurrent Mercury Grand Marquis or a Lincoln Town Car would fit.


Look at the back of the eng. by the firewall on the passengers side, it should say TRANS on the handle


The water pump will be located where the lower hose from the radiator meets the engine. It will have a pulley for the belt on it. Good luck.


The starter is mounted on the passenger side of the transmission. It has one wire connected to it (with a small bolt) and there are two bolts holding the starter in.


there is a spcial key required to remove them


There isn't a reset switch on a 1983 grand marquis as Ford didn't put fuel injection into cars until 1986.


Shiny square box on drivers fender near headlight.



Fuel pump reset ??? Trunk, driver's side, under carpet..



yes it has an e.c.m. also an ignition module and brake and suspention controller.


there is a panel below the steering column. there are two screws at the bottom of the panel and on each side. remove those two screws and the panel will lift from the clips on top . the fuse panel is then exposed.


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1986 model year. Last two numbers of the serial number are the year.


40-80 PSI cold.20-40 PSI hot.40-80 PSI cold.20-40 PSI hot.


I believe it's about 28 horsepower.


take to an autoshop or put a new batterry and ignion coil change cap and rotor cap and start plugs and if is fuelinjection put new injectors and have them clean



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