Question about 2002 Mercury Grand Marquis

1 Answer

I have a 2002 grand marquis,140 thousand miles...i change my oil on the regular,i take good care of the problem is on my last oil change i noticed a slight tapping noise like the valves where got stronger as i punched the gas pedal sumtimes...what i'm trying to find out is do i need a motor or heads...or a knock sensor and what is that?

Posted by on

  • tim mcgrath May 11, 2010

    what weight oil are you using,



1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 27 Answers

A knock sensor is basically a resistor and a spring, and what it does is it reduces valve ping. Valve ping is when the fuel is not properly burned and tries to explode before the valve is fully closed and it will make a pinging noise when under load or at higher RPM. If the sensor is bad it can cause detonation, detonation is when the fuel explodes before the valve is closed and can cause a cracked, or exploded piston, bent valves etc. Your problem does not sound like that of a bad knock sensor, predominantly you will only hear the "ping" under load and not at idle and if it was bad your check engine light should be on. this sounds more like a rod knock. change the oil again and use only AMSOIL and an amsoil filter, amsoil is proven to last longer than any other oil, 600,000 miles without a change, or a filter change.

Posted on Feb 05, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My 2003 mercury grand marquis has what I describe as lifter chatter for about the first three seconds after starting. Should I move up in oil weight? or take to shop?

this is normal for vehicle this age we own a 04 grand marquis and have had three other vehicles with 4.6 engine and all of them do this with mileage and age i would recommend a good brand name oil and oil change every three thousand mi only thing that may help some is an oil additive called moa that is made by bg also run a motorcraft oil filter FL 820s

Jan 12, 2013 | 2003 Mercury Grand Marquis

1 Answer

Hi, Im looking at buying a 2003 Porsche Carrera 4S 911, it has 82,000 miles. They want $27,000 firm. The cars looks over all in good shape. Having 82000 miles should I have concerns? Thank you

well 82000 miles is not a bad thing make sure it has always had a routine inspections and regular
oil changes brakes ect. i have a jeep grand wagoneer with 156000 miles on it im the 3rd owner
and it runs great its not always the miles. its how good they took care of it

hope this helps you
good luck

May 05, 2011 | 2002 Porsche 911

1 Answer

What is the routine that i must follow to keep my car running good

keep the oil changed every 3 to5 thousand miles and a good tuneup and check brakes, joints, and any thing that moves.

Mar 04, 2011 | 1999 Mercury Grand Marquis

2 Answers

How often do I change the oil

Every 3 -5 k miles. Regular every day driving. Towing,dirty conditions etc about a third less than that. Some new motor oils offer extended mileage, you can read those for more info. But remember, the longer you keep the oil in the vehicle the more depsoits from burning fuel is churning around in your engine.

Feb 05, 2011 | 2002 Chevrolet Malibu

3 Answers

How often should one change oil in a 2004 Mercury Grand Marquis

if driven in town or stop and go or hot weather then every 3,000 miles, if driven moroe hiwat in a mild climate then every 5,000 miles is what i recommend.

Sep 22, 2010 | 2004 Mercury Grand Marquis

1 Answer

It has 192,382 miles what type of maintence

I thought you were thinking of buying it? Scared me there for a minute. Your own truck, you have taken care of it, keep taking care of it. I know they sell extended warranties, but, it might cost you more than the repairs. I have 2 trucks out there that both have over 250,000 miles, and they are still going, but they are disposable now,if something happens, it's to the bone yard. Keep the oil change habit going, peek under the hood at regular intervals, don't go mountain climbing. And don't let the kids borrow it. It should last a while. Hope this helps. One more thing, keep an eye on the Cherokee forum for the latest repairs and updates.

May 15, 2010 | 2002 Jeep Grand Cherokee

1 Answer

I don't have a problem, my 2001 Mercury Grande Marquis runs fine and gets between 17 & 21 Miles per gallon. However, it has almost 60000 miles on it and I thought maybe it was time to change the plugs,...

I would use original Ford parts. There are a lot of gimmicks out there, most do not work.

I have an LSE, 2002 and get about the same mileage. I added a K&N airfilter and get a little more pep on both my car and truck. They cost more, but its all cleaning once you use them.

Dec 26, 2009 | 2001 Mercury Grand Marquis

1 Answer


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


May 27, 2009 | 1996 Mercury Grand Marquis

1 Answer

2002 Jeep Grand Cherokee Laredo 96,000 miles I service needs

change all fluids in front and rear diff axles as well as transfer case if its 4x4 also belt change brake check and I have great luck using LUCAS fluids for increasing life of all engine and trans components, can be found at local parts store they work very well if you take care of this jeep it will last for a very long time

Nov 24, 2008 | 2002 Jeep Grand Cherokee

Not finding what you are looking for?
2002 Mercury Grand Marquis Logo

362 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercury Experts


Level 3 Expert

76070 Answers


Level 3 Expert

5520 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Are you a Mercury Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides