Question about 1993 Mercury Grand Marquis

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Air and fuel ratio

Just want to know what the air and fuel ratio should be for a 78 mercury marquis brougham

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OPTIMUM RATIO IS 14:1 THAT IS 14 PARTS AIR TO 1 PART FUEL.

Posted on Dec 02, 2008

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1984 mercury grand marquis 5.0 has spark and fuel won't start


Have you checked the air filter?

Is it cranking?

Check the battery voltage. It should be around 12.5 volts or higher.

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I need to know what the stock compression pressure in psi should be on a 1991 mercury grand marquis 302 5.0L, I dont want the ratio, I need the psi. What was it from factory?


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each cylinder should have the plugs removed, and each cylinder should have atleast 150 psi, with no more than a 10% difference between the 8 cyl .

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Jan 07, 2011 | 1991 Mercury Grand Marquis

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I have a 1990 Mercury Marquis, the fuel is running really rich. The car will only idle for a minute, then dies. It will run if you keep your foot on the gas, as soon as you let off the gas, it cuts out and...


there are two things you need to check out 1. is the check engine light on... if so its most likely an oxygen sensor that has gone bad, the oxygen sensor tells the vehicle the air/fuel ratio to use to make the vehicle efficient on fuel.. thus if its bad the vehicle will either run extremely rich, or way too lean.. and the secont thing to check out is your fuel pressure regulator, if its stuck it will allow the fuel to flow endlessly...hope this helps

Dec 14, 2010 | 1990 Mercury Grand Marquis

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1996 MERCURY GRAND MARQUIS WITH OCCASIONAL SLUGGISHNESS ON ACCELERATION AND SEEMS LIKE IT MAY BE USING MORE GAS THAN USUAL. HAS BEEN WELL TAKEN CARE OF, REG. OIL CHANGES, NEW FUEL FILTER 2 YRS AGO-DR


I would use 10W40 in the 96 and 5W20 or 30 in the 2002.

For the 96 with sluggishness, you need to gently clean the MAF sensor wires with carb cleaner and a toothbrush. It is in the air intake tube. After cleaning, disconnect the battery for 1/2 hour, then reconnect so the computer can relearn the clean sensor. Drive for 10 miles, it will run rough until it relearns.


Section 03-14: Engine Controls, Electronic 1996 Town Car, Crown Victoria, Grand Marquis Workshop Manual
DESCRIPTION AND OPERATION Mass Air Flow (MAF) Sensor The mass air flow sensor (MAF sensor) (12B579):
  • is mounted on the corner of the engine air cleaner (ACL) (9600).
  • uses a hot wire sensing element to measure the amount of air entering the engine; air passing over the hot wire causes it to cool.
  • sends out an analog voltage signal to the PCM (12A650) to determine the intake air mass. The PCM will then calculate the required fuel injector pulse width to provide the desired air/fuel ratio.
The mass air flow sensor hot wire sensing element and housing are calibrated as a unit and must be serviced as a complete assembly.

Mass Air Flow (MAF) Sensor

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May 27, 2009 | 1996 Mercury Grand Marquis

1 Answer

Wiring the fuel pump


THIS 1994 Mercury Grand Marquis Fuel Pump Wiring Diagram41873503.gif Mercury Marquis Fuel Pump IS A 94, BUT IT IS THE SAME FOR BOTH YEARS.

Aug 26, 2008 | 1993 Mercury Grand Marquis

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