Question about 2003 Mercury Grand Marquis

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I have got a mercury grand marquis 2003 LS ultimate and having a knocking noise for few seconds when accelerating sometimes specially when the engine is hot and that will reduce the power. any ideas?

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  • 283 Answers

When you say the engine is hot are you talking about the normal operating temperature? Has the Check Engine or Service Engine light come? If so, was the On Board Diagnostics system checked for a codes? Usually a knocking sound during acceleration indicates a improper fuel mixture or low octane.

Posted on Jan 19, 2013

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Posted on Jan 02, 2017

Shadowloo
  • 31 Answers

SOURCE: 2003 Grand Marquis LS Ultimate ac switches from

Does it only change when going uphill, or under heavy acceleration? Or is it just when ever it feels like it? Generally, it's vacuum controlled and on a Ford, loss of vacuum when accelerating or pulling a grade under heavy loads can be normal, causing the air to come out of the defrost. To answer your question, the blower door is located in the dash, generally behind the radio area.

Good luck!

Posted on May 22, 2010

MNfisherman
  • 11896 Answers

SOURCE: How to install a new power window motor in my 1993

Remove all screws to door panel. Remove the lock and window controls. Then take large flat-tip screwdriver and gently pry directly next to plastic studs holding panel on to door. Lift door panel off. Remove plastic out of the way. You will now have access to window motor. You may have to solder off old wiring. Or if you have enough to cut, would be good

Posted on Sep 11, 2009

ginko
  • 19396 Answers

SOURCE: 2003 mercury grand marquis LS

The blend door is stuck in cold position. That usually happens because the blend door actuator has failed.

You will need to test and replace the blend door actuator.

To replace the actuator you will need to take apart the dash and remove completely the instrument panel,d isconnect the connector, remove the four screws, remove the temperature blend door actuator and replace it.

The replacement is not a job for beginners, since you have to take apart the dash to access the actuator.

Regards.


Posted on Nov 18, 2009

  • 5480 Answers

SOURCE: How to reset Check Engine

You can remove the NEG battery terminal for 10 minutes and it will clear. Or go to Autozone or Oreillys for a free scan, find out why it came on, then have them clear it with their scanner.

Posted on Dec 02, 2010

  • 8 Answers

SOURCE: 2005 mercury grand marquis a/c problem sometimes

could b your blend door.

Posted on Mar 12, 2011

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I have a 1992 Mercury Grand Marquis with the 4.6L V8 with roughly 50,000 to 60,000 miles on it and while the engine runes great when it is cold, when the engine warms up, it starts to rattle/knock during...


First, there are 8 bolts holding the metal Airhorn to the Intake manifold. Underneath this part is a gasket and under the gasket is a groove. The groove can Carbon up and affect the performance of your car. The gasket costs $10 and the job takes an hour or more.

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Does it only change when going uphill, or under heavy acceleration? Or is it just when ever it feels like it? Generally, it's vacuum controlled and on a Ford, loss of vacuum when accelerating or pulling a grade under heavy loads can be normal, causing the air to come out of the defrost. To answer your question, the blower door is located in the dash, generally behind the radio area.

Good luck!

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