Why does my car miss and hesitate during cold weather. 2001 Mercury Grand Marquis. Feels like spark plug and bad wire reaction, but only happens during cold weather.

Asked by May 07, 2010 at 03:42 PM about the 2001 Mercury Grand Marquis

Question type: Maintenance & Repair

5 Answers

9,830

What do your plugs look like? They may need cleaned, re-gapped, or replaced.

3,425

If your spark plugs were bad, than it would be an all the time issue. And never clean or regap spark plugs. They have a particular shelf life for a reason. If they are fouled, or the gap is too large by age, THEN replace them. People overly change perfectly good parts all the time while misdiagnosing problems. How many miles? 4.6L? Any recent services done? Is it constant when its cold or does it improve when the vehicle warms up?

1 people found this helpful.
9,830

There is no need to waste money on a new plugs if the old one are just gapped incorrectly. Obviously if they are very old it would be better to replace them rather than clean them. If there was an ignition issue, like a weak spark, it could be less noticeable as cylinder temperature increase making it easier to burn the fuel.

3,425

Regardless of cylinder temperatures when the vehicle has warmed up, a weak spark would cause a rich condition to occur causing an SES illumination for a multiple DTC fault even if the cylinder temps were over 1500 deg. The only way a weak spark would be negated byincreasing cylinder temperature is if it were hot enough to 'diesel' the engine and then 'a weak spark' would have no bearing. Im also curious as to how all of the spark plugs would magically ungap themselves, mileage ner the matter, and this being the case wouldnt it run like crap regarless of ambient temperature? Also, plugs never get dirty for fun. If the plug has some form of medium needing to be cleaned from it than there is a more serious underlying issue that needs to be addressed such as a fluid leak, rich/lean fuel mixture, igntion fault, etc. Furthermore, if i were to take my vehicle to the shop and id already paid for the labor to remove the plugs to check for a concern, it would be more beneficial to replace them when, a non platinum/iridium plug only runs about two bucks a plug.

9,830

I never said the plugs would un-gap themselves but rather that they could have been install without the proper gaps being set. A too large gap combined with deposit build up could be causing a weaker spark making the engine more prone to missing. A lot of people just install plugs straight from the box assuming the gaps are pre-set.

1 people found this helpful.

Your Answer

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,206 nationwide Grand Marquis listings starting at $1,200.

ZIP:

Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
    Reputation
    5,980
  • #2
    kbro
    Reputation
    2,210
  • #3
    Js08016
    Reputation
    2,050
View All

Related Models For Sale

Used Lincoln Town Car
22 Great Deals out of 1,353 listings starting at $1,995
Used Ford Crown Victoria
5 Great Deals out of 697 listings starting at $1,700
Used Chevrolet Impala
388 Great Deals out of 25,614 listings starting at $900
Used Ford F-150
2,293 Great Deals out of 215,019 listings starting at $1,300
Used Chevrolet Tahoe
527 Great Deals out of 36,513 listings starting at $1,299
Used Ford Mustang
250 Great Deals out of 36,706 listings starting at $2,500
Used Ford Taurus
177 Great Deals out of 15,853 listings starting at $981
Used Cadillac DeVille
1,276 listings starting at $1,988
Used Lincoln Continental
32 Great Deals out of 2,825 listings starting at $21,995
Used Chevrolet Silverado 1500
1,753 Great Deals out of 148,948 listings starting at $828
Used Toyota Camry
789 Great Deals out of 70,452 listings starting at $1,000

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
13 listings starting at $5,888
2010 Mercury Grand Marquis For Sale
4 Great Deals out of 75 listings starting at $3,500
2009 Mercury Grand Marquis For Sale
58 listings starting at $3,777
2008 Mercury Grand Marquis For Sale
3 Great Deals out of 100 listings starting at $2,850
2007 Mercury Grand Marquis For Sale
7 Great Deals out of 105 listings starting at $1,200

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.