Question about 2000 Mercury Grand Marquis LS

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My 2000 grand marquis has a knocking sound at higher rpms

I had been long overdue to change the oil..but light didn't come on. Turns out I was a couple quarts or more too lkow...didn't drive it long this way...Changed the oil and filter...started up rough and seemed okay....however at highrt rpms there seems to be a cylinder type knocking sound

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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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

  • 83 Answers

SOURCE: 2000 grand marquis cruise control not working

Have seen this problem before. You need to look under dash at brake pedal and find a blue switch with plunger contacting pedal, disconnect connector and jump with a peice of wire and drive to see if cruise works and if it does replace deactivation switch this should get you going.

Posted on Aug 26, 2009

  • 126 Answers

SOURCE: how can i change fuel filter in my grand marquis

you will need the proper Quick Disconnect tool, Look on the Frame rail for the filter, remove filter from the spring type retainer, remove the safety clips on the lines but not remove them completely, insert the disconnect tool & push into the fitting of the fuel line, push line & tool into eachother then pull filter away from line, if not done properly you will have a big problem putting the line back on

Posted on Oct 28, 2009

dttech
  • 4803 Answers

SOURCE: 2003 grand marquis with misfire code p0316

The first problem you have is assuming that the ignition coil is the only thing that can cause a misfire.

Diagnostic Test Code (DTC) P0316 is a "continuous memory only" code that indicates that there is a fault causing a misfire during the first 1000 revolutions of the crankshaft immediately after engine start-up. This should be accompanied by the regular cylinder misfire monitors (Codes P0301 through P0310) unless the misfire does not continue long enough for the regular misfire monitors to determine which cylinder is misfiring.

In order to determine what is actually causing the problem, you must have access to a scan tool that can perform Key On Engine Off (KOEO) fault testing and Key On Engine Running (KOER) fault testing as well as interfacing with the onboard engine computer to read live data and perform system tests.

Please note that generic OBD code readers DO NOT have the capabilities to do what you need to diagnose this problem. You will most likely get additional DTCs that can help lead you to find the source of the problem when KOEO and KOER tests are run. Generic OBD code readers can access only continuous memory DTCs.

Possibilities/conditions/systems that can cause this code are:
>Camshaft Position Sensor
>Low fuel: less than 1/8 tank
>Stuck open EGR Valve
>Blocked EGR passages
>Ignition system
>Fuel Injectors
>Fuel injector control circuits
>Running out of fuel
>EVAP canister purge valve
>Fuel Pressure
>Evaporative emissions system
>Base engine (mechanical) problems

Posted on Mar 05, 2012

  • 86 Answers

SOURCE: show engine spark plug cylinders on 2000 mercury grand marquis 4.6l

Firing order 1-3-7-2-6-5-4-8 Cylinder locations: Passenger side starting at front of engine and going to the rear: 1-2-3-4 Driver side front to rear: 5-6-7-8 This actually for a 1996 model, but I should imagine it is the same.

Posted on May 20, 2012

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Slight knocking sound at higher RPMs. Oil light seems to come on occasionally at lower RPMs. Engine previously overheated.


Apparently the 3.5 liter V6 had a lot of oiling problems, see link attached.
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The slight knocking you hear may be a valve lifter that has gummed up. The head gasket problem may have allowed some coolant to get into the oil exacerbating gunk buildup. If it a deeper problem like rod bearings, you would have to decide if it is worth the trouble of fixing it or drive it until it drops.

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grinding sound is not good, there is a knock sensor on the engine if this registers a bad knock it will turn off ecu to stop more damage. has the engine been stud for a long time. when was the oil last changed. is there any thing obstructing the engine, is the engine burning oil or water is there a white film on the oil filler cap. please check these out

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I have a 2002 grand marquis,140 thousand miles...i change my oil on the regular,i take good care of the car..my problem is on my last oil change i noticed a slight tapping noise like the valves where...


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.

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Jan 23, 2010 | 1998 Chevrolet Venture Cargo

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Oil pressure light turns on at idle then turns off at higher rpms. Can anyone tell me whats causing this? I think is the oil pump sucked up something.


Hello There

Yes this is engine pressure problem and being a cavi it's most likely the big end that will need replacing. You'll probably hear a knocking sound from the engine especially from under the engine. There are some iol additive which will fix your problem for a short while.

Hope this helps.

Please don't forget to rate me.

Many Thanks

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I have a 1994 Mercury Grand Marquis... it pings on accelaration, do I adjust the timing and if so.. how ?


use a higher octane gassoline
sounds like u got a spark knock.
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Dec 13, 2008 | 1994 Mercury Grand Marquis

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