Question about 1994 Mercury Grand Marquis

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1994 grand marquis stumbles and backfires on acceleration in the cold.

If the car isn't totally warmed up it stumbles on acceleration. When warm it 's fine. Also there is a slight harmonica note sound occasionally at idle., primarily after reving engine and it has returned to idle, even when warmed up to normal operating temp.

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 5495 Answers

SOURCE: I have a 1992 Mercury Grand Marquis with the 4.6L

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.

If this does not help, you may need a knock sensor which is suppose to reduce the timing and keep the engine from knocking.

You can also get a free scan from Autozone or Oreillys and some other parts stores. This may tell you if other parts are needed. The gasket and groove I told you about will sometimes generate a Code 401. Just try cleaning the groove instead of buying an EGR or Solenoid.

Posted on Nov 08, 2010

emissionwiz
  • 75807 Answers

SOURCE: 99 Grand Marquis won't stay started when engine cold.

Here is the most common cause of this stall, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

Posted on Nov 06, 2008

  • 7 Answers

SOURCE: car stumbles, backfires until warm

You need to replace your distributor. There has been many problems with these. I had the same problem with my 1993 villager and had tried many different things and none worked. I went to a junk yard and got a used distributor and now it runs fine. I would try this before anything alse.

Posted on Jun 06, 2009

betz73
  • 298 Answers

SOURCE: Changed the MAF in 97 Grand Marquis. Car still

you have a little screen just under the pcv valve that get clogged up on those years, look to the rear of the engine on top , look for a hose that connects to the pcv valve (you may want to get a chiltons manual) take out the pcv valve then remove the screen that is under it, so it can breath again this will be a tremendous help to you.
(don't forget to replace the pcv valve)

Posted on Dec 29, 2009

  • 752 Answers

SOURCE: why would my 2001 mercury grand marquis stall when

check yur idle air control valve

Posted on Jan 26, 2010

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Car stumbles, backfires until warm


You need to replace your distributor. There has been many problems with these. I had the same problem with my 1993 villager and had tried many different things and none worked. I went to a junk yard and got a used distributor and now it runs fine. I would try this before anything alse.

May 30, 2009 | 1993 Mercury Villager

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