Question about 1994 Mercury Grand Marquis

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94 Merc Grand Marquis.... Runs rough from a cold start. Usually backfires a couple of times---feel it underneath me... then smooths out with acceleration. Seems like it's skipping at red lights and when idle. Replaced the plugs, air filter, and gas filter...still didn't smooth it out. Any suggestions before I do a DTL on it??

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  • 61 Answers

Its sounding like it could have your timing off...either electrical, or internally. If all plugs have good spark, scratch electrical. Then you could be looking at a timing chain.

Posted on Oct 14, 2013

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SOURCE: rough idle

have this car taken to an auto repair and ask for a engine oil flush and engine oil change, that mught help

Posted on May 28, 2008

  • 1 Answer

SOURCE: 1994 Cougar XR7 Engine idling rough and running rough at low and

Not saying this for sure, but I had the same problem, and i have a 1994 xr7 V6 3.8 L , and all u need to do is set the idle down manually because your computer could have seen that the injector was stuck open, and tried to turn up idle to keep up with the amount of fuel being pumped, worth a shot :P

Posted on Feb 21, 2009

StormStrikes
  • 104 Answers

SOURCE: "check engine light flashing"

The flashing check engine light is typical of a misfire issue. There are two things I would do to start with.

1. Take the vehicle to an auto parts store like Autozone and have them hook up their scan tool so that they can retrieve stored trouble codes. Even if the check engine light is not on, they should be able to retrieve recently stored codes.

2. Do a complete tune up. New plugs, new plug wires, new air filter, new fuel filter if it has not been done recently.

If the parts store pulls the codes and they cannot tell you what they mean, post them up here and I will see what I can dig up for you.

Posted on Jan 02, 2009

  • 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

  • 1 Answer

SOURCE: rough idle

Mercury had a recall on 3.0 duratech motors in 2000 and 2001. If you get a fuel smell at startup then you might have a bad lower intake gasket, it could cause a miss if seal is cracked. Article No. 01-4-3 you can get it on AllData.

Also, check the PC rubber L piece that runs from the PVC valve to under the throttle control - it could be busted.

Make sure ignition wires are not cracked. If you haven't tuned it up in over 30-40K consider doing that.

Posted on Sep 16, 2009

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