Question about 2003 Mercury Grand Marquis

2 Answers

The car has a slight **** (almost like a missfire) check engine light does not come on.runs perfect for miles then a little miss or two and its fine I can press the gas to the floor and the car takes off.All plugs and coils where replaced

Posted by on

  • bmdks Jul 21, 2009

    Filter also was changed

  • bmdks Jul 21, 2009

    tried a few different brands also been using high test gas, seems to be a little better since the problem began

×

Ad

2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Check the EGR/DPFE sensor. They are all one piece for the 03 and newer models. I had the same problem and after replacing inectors,coils and plugs I still had the problem. If there are no vacumn leaks then this may be the problem. Try to clean the EGR and MAF sensor and if the EGR is really bad then look into the OEM replacement part since alot of aftermarket units trigger Check engine light. Try to search for DPFE problrms online and you will see that this is a common problem.

Posted on Aug 16, 2009

Ad
  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 305 Answers

Sounds like a clogged filter........most likely to be the inline fuel filter, thats the one just before the fuel pump

Posted on Jul 21, 2009

  • jim galbraith
    jim galbraith Jul 21, 2009

    have you tried fuel injector cleaner....the additive type thats added to your fuel, this cleans deposites in the injectors.....(..small tip..), always use more than the manufacturer recommends........as older engines need a little more persuation................

  • jim galbraith
    jim galbraith Jul 21, 2009

    try some heavy duty engine flush, but after you start your engine, run it to normal running temp.......then run you engine at 3000 RPM..for 2mins...( sore on your foot,but worth it )....then switch off, and restart straight away, and run engine normaly..........

×

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

2003 Buick 3800 engine 82,000 actual miles on it multiple/random misfire code How it started.. Car was running fine. Check engine light started flashing and engine started missing. What...


You can't rule anything out yet. It could be a plug or injector among other things, but probably not low fuel pressure. If you have a code 300 and nothing else, you may have to wait until the problem gets bad enough to set additional codes. And if any of the sensors fail, such as the cam or crank sensors, you'll get a code for those to be tested.
Have the plugs been checked or replaced in the past 30,000 miles ?

Mar 12, 2014 | 2003 Buick LeSabre

2 Answers

I have an 01 hyundai accent gl 4 door 1.6 dohc. timing belt broke at 106,000 miles and bent some valves. got an engine out of an 03 accent 1.6 same everything with 35,000 miles. pulled old and put in 03...


The 2 components that I would suspect would be the Coil pack and the Cam sensor.
I had a similar issue on a Sorento. Intermittent miss on one of the cylinders. The Coil pack was bad. When I replaced it, there was a burnt smell to the bad one. It sounds like things were a bit bumped around with this engine as the O2 sensor was bent. The Coil packs are very fragile.
Hope this helps. God Bless

Apr 07, 2011 | 2001 Hyundai Accent

2 Answers

My "Check Engine" light is flashing! 96 Dodge Intp 128,000 miles. Just got it back from $1,500.00 worth of repairs.


flashing light means a severe missfire and emminent cat converter failure.
in other words it has a bad missfire

Apr 23, 2010 | 1996 Dodge Intrepid

1 Answer

1999 Suburban, 5.7L loss of power then, it seems to run fine then loses power again. Now if you try to give throttle it knocks and pings and wants to die. Light throttle will make it go a little. I just...


Replace spark plug wires and plugs. Sometimes old wires will arc to the engine block, causing missfire. Check the wires at night with lights off and engine running, if they're bad, you'll defenitely see them arcing to the engine. if they are...replace.

Nov 30, 2009 | 1999 Chevrolet Suburban

1 Answer

Slight miss, starts a little hard then runs fine rough idle from time to time


It sounds like its out of time move the distriutor a little bit

May 10, 2009 | Jeep Cherokee Cars & Trucks

Not finding what you are looking for?
2003 Mercury Grand Marquis Logo

Related Topics:

210 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercury Experts

yadayada
yadayada

Level 3 Expert

79865 Answers

fordexpert

Level 3 Expert

5687 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Are you a Mercury Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...