Question about 1989 Mercury Grand Marquis

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I have a1989 mercury grand marquis, 5.0L, sometimes it will not start. I pulled the codes today. Trouble codes were , coolant temp sessor, intake air temp sensor, and egr valve pressure transducer/position sensor sonic voltage above closed limit. Which one of these would not let the car start. It runs great when it starts, but you never know if its going to. Any help, or thoughts would br greatly appreciated.

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Clean out egr valve first/egr valve blocked

Posted on Mar 15, 2011

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My 1994 grand marquis spits & sputter when the engine is cold. Also sometimes loses power after it's left ideling too long sometime I don't have enough power to get up hills we replace the


If the check engine light is not on, I doubt there is much you can do.
It sounds like one of the engine temp sensors or one of the other sensors. The engine temp sensor and the intake air temp sensor tell the computer what the outside air temp is and the coolant temp which allows the computer to regulate the amount of fuel going thru the injectors. Generally if one of the sensors has failed the check engine light should be on.
It could be low fuel pressure too.
You may have to have a shop check the sensors with a scanner and the fuel pressure with a gauge.

Sep 03, 2012 | 1994 Mercury Grand Marquis

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Where is the coolant temperture sensor for a 2000 mercury grand marquis LS


I'm showing a fan clutch on the water pump instead of an electric fan on the radiator.
But you could have both.
The computer takes the signal from the temp sensor on the intake manifold to determine engine temp. An electric fan should come on around 230 degrees. There is a relay between the fuse and the fan motor.

Jul 18, 2012 | 2000 Mercury Grand Marquis

1 Answer

I can turn the ac off and turn the heat on in my 1998 Mercury Grand Marquis. How do I control the thermostat? I have tried putting on auto,vent,floor/defrost,defrost, and turned the temp up to 90 and it...


It sounds like thermostat (in coolant system) needs to be replaced. They only control you have for temps are the dials on dash, but if coolant thermostat is sticking you're limited to what it outputs. Replace coolant thermostat and you should be "good to go"

Feb 22, 2011 | 1998 Mercury Grand Marquis

1 Answer

Instructions to fix a thermostat on 1993 Mercury Grand Marquis


Thermostat should be at the base of the upper hose where it connects to the intake manifold.

You should see two bolts securing the housing to the intake. You will need to drain some coolant from the system first via the radiator drain before you remove the housing.

When reinstalling the housing, be VERY careful to not over tighten the bolts as they will strip/break way easier than you want to know.

Then, refill system, start up and idle while adding coolant till system is full.

Make sure to have heater on high during this process to remove any possible air from the core.

May 20, 2010 | 1993 Mercury Grand Marquis

1 Answer

Is there a relearn procedure for blend doors in a 97 mercury grand marquis. Removed battery and now ac blows hot only


probably has a bad belend air door motor, to run the systen completely through its self diagnosis process" if has electronic auto temp control"
press."off "and "floor" at the same time release... then hit the "auto" button
wait til gives you code...... it will then "SOMETIMES start WORK normal til moved again by you.....
if manual, change hot to cold, listen carefully for clicking ...if clicking rplave blend door motor and inspect the plenums door while motor out

Jan 20, 2010 | 1996 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

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