Question about Mercury Grand Marquis

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Engine missfire 1999 grand marquis - Grand Marquis Mercury Cars & Trucks

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  • bridgetlois Oct 30, 2008

    Same problem, really bad bucking problem. Thought there was a crack in manifold, so replaced manifold and spark plugs. Next on agenda is to replace coils.

  • redmustangle Jan 21, 2009

    I've had a 1995 and currently a 2000 Grand Marquis and both have had engine miss problems. I took the 1995 in to the dealership after I had changed plugs and wires and coils.They cleaned the sludge from the engine (that didn't fix the problem but did seem to give me more power)but it was still missing, until they found a bad wire. It ran fine for about a year and then the "miss" problem returned. My 2000 had miss problems last summer that went away and has now returned this winter.

  • bobmaynard21 Mar 14, 2009

    runs good cold but skips when it warms up.Like a popcorn machine going up hill.

  • etymaddict Apr 26, 2009

    I have been told that my problem (similar in nature to that described above) would be remedied by replacing the intake manifold. Is this the only possible solution? It seems that this would be a costly procedure - I would obviously like a more financially 'friendly' option to attempt...

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Concerning engine miss. I have a 1999 Marquis. I have heard the problem goes back to cylinder head design. Once the injectors are worn, the burn in the cylinder becomes less efficient, causing the miss. Just by chance one weekend, I unloaded all the junk out of my trunk,(less weight, less load on engine). Also had tire pressure at old school levels (32 psi). Brought pressure up to the 44psi shown on tire and guess what, miss has left. Next fill up, I'm going to 89 octane for the slower burn.

Posted on Jun 18, 2009

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ZJLimited
  • 17970 Answers

SOURCE: 1999 grand marqui, 4.6 lit. engin. what is the

Make: MERCURY
Model: GRAND MARQUIS
Year: 1999
Engine: V8 - 4.6L - FI - - GAS

Part Number: RS12YC
GAP : .054" (Original Equipment Manufacturer and/or Original Equipment Equivalent)

Hope this helps.

Posted on Oct 02, 2011

honeymokey
  • 3113 Answers

SOURCE: what kinf od an engine does a 1999 mercury grand

It's a 4.6 Ford Modular engine is Ford Motor Company's overhead camshaft (OHC) V8. 1998-2000 Ford Crown Victoria/Mercury Grand Marquis, 215 hp (160 kW) and 285 lb·ft (386 N·m) with dual exhaust option

Posted on Dec 15, 2010

  • 1114 Answers

SOURCE: 1999 mercury grand marquis check engine light on

You will need to have a OBD2 scan completed to find out the fault and code that activated the check engine light.If you haven't a OBD@ scan tool you might want to stop at a garage and have it scared they might charge you for that the cost varies from $25.00 and up.

Posted on Dec 23, 2010

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1 Answer

1999 grand marqui, 4.6 lit. engin. what is the spark plug gap and torque.


Make: MERCURY
Model: GRAND MARQUIS
Year: 1999
Engine: V8 - 4.6L - FI - - GAS

Part Number: RS12YC
GAP : .054" (Original Equipment Manufacturer and/or Original Equipment Equivalent)

Hope this helps.

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How safe is it to drive a 2005 Grand Marquis with 123, 000 miles when the "engine light: keeps blinking on and off?


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Need to replace coil packs on a 1999 grand marquis ls


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Jan 24, 2011 | 1999 Mercury Grand Marquis

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What kinf od an engine does a 1999 mercury grand marquis have


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Dec 15, 2010 | 1999 Mercury Grand Marquis

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Where is the thermostat located on a 1999 grand marquis


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Jun 28, 2009 | 1999 Mercury Grand Marquis

1 Answer

Ignition ccoil replacement 4 and 6


the last number in a po30 code is the cylender with the missfire. you say you have po306 and po302 which means #6 and#2 are missfiring. if you stand in front of car the passenger side has 1 through 4 cylenders starting with # 1 in front and # 4 in rear and driver side has 5 through 8 starting with # 5 in front and # 8 in rear. passenger side 1 2 3 4 - driver side 5 6 7 8. if you have indavidual coils on each plug then just unplug the coil and take the single 7mm screw out that holds it in place and the coil will come straight up off the plug

Jan 19, 2009 | 1999 Mercury Grand Marquis

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