Question about 2002 Mercury Grand Marquis

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2002 mercury grand marquis missing and hesitating

Already changed out plugs,boots,maf sensor,fuel pump fuel filter and tps. diagnostic machine shows different cylinders misfiring at different times

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Since it could be several different things in the ignition system, as well as fuel and other things, you may have to get professional help.
Some things you did not mention are the coil, cam and crank sensors, and the computer.
I assume the check engine light is on and the only code you have is a random miss. There are a lot of things to rule out.

Posted on Jan 16, 2013

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Posted on Jan 02, 2017

  • 186 Answers

SOURCE: 2001 mercury grand marquis. Engine stutters or

Start car and use a squirt bottle of water to wet the wires and coil, if you see it spark or run rough one or both are bad, repair the wires first as they are more common.

Posted on Aug 02, 2009

jim0264
  • 41 Answers

SOURCE: stalling 2002 mercury grand marquis

Most parts retailers can tell you what the pressure should be from the pump or what pressure the pump is rated to put out. If pressure is low from the fuel pump- replace it.

Posted on Jan 12, 2013

  • 12 Answers

SOURCE: I am experiencing engine hesitation on my 2000

is the check engine light on

Posted on Jul 03, 2011

  • 1114 Answers

SOURCE: 2002 Mercury Grand Marquis - Emission Testing Error Detected

usaly spark plugs and wires !!

Posted on Dec 26, 2008

dansss
  • 14 Answers

SOURCE: my 2002 mercury grand marquis is missing on one cylinder

ALLDATAdiy - The Leading Source of Professional Diagnostic and Repair Information.

Posted on Mar 09, 2012

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Stalling 2002 mercury grand marquis


Most parts retailers can tell you what the pressure should be from the pump or what pressure the pump is rated to put out. If pressure is low from the fuel pump- replace it.

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Hesitation problems can be caused by a number of thing's on vehicle's with electronic fuel injection , not like the old days of carburetors where most likely it had a bad accelerator pump . Throttle position sensors (TPS) can get a worn spot that would act just like a bad accelerator pump . MAF sensors (mass air flow ) Can also cause Hesitation plus ruff running , bad fuel economy , a IAT sensor ,(intake air temp ) ECT - engine coolant temp. sensor can also cause this problem . Unless you want to replace all these parts i suggest you have it diagnosed by a qualified repair shop that has the electronic diagnostic tool to test it .
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I have a 99 Buick Regal, it hesitates and even stalls out. I had the oil and filters changed as well as the fuel filter. It is still hesitant and feels like it wants to dye. When I changed the fuel filter...


A combination of problems could be causing your hesitation/stall issue:
  1. Bad MAF (Mass Air Flow) sensor
  2. Bad TPS (Throttle Position Sensor)
Getting a free diagnostic test to pull codes will make narrowing down your problem a bit easier. Most chain auto parts stores will do a complimentary diagnostic test. The most common cause with a car that stalls when warm is the TPS. It controls your idling speed under all conditions. Even replacing the MAF alone doesn't always fix the problem although it may show up as being problematic. The 2 parts basically go hand in hand with your particular problem.

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All of a sudden my 2004 mercury grand marquis with 55000 miles idles rough. Not really noticeable when driving but do believe there is a lack of power and mpg seems to have declined. Can u help???


The vehicle is 7 years old

The spark plugs should have been changed at 60,000
Gas filter every 3 years
Air Filter every 3 years or sooner
The MAF Sensor cleaned every year
By now the O2 Sensors are slow to respond
If they have 100,000 change the front 2 sensors
Check TPS Voltage
Check Fuel Pressure at the fuel rail
Egr Valve most likely bad
If you have COP Ignition Coils, they may be misfiring,
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Unrelated--change trans and power steering fluids
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1 Answer

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Time to go get it diagnosed. Could be a tunup issue or cranks sensor or fuel pump. You most likely have a code stored to help diagnosing

Nov 02, 2009 | 1997 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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