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.

mzpeggyb
0

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

Question type: Maintenance & Repair

5 Answers

Larry Quigley
7,500

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

Jon Romero
2,555

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 out of 1 people think this is helpful.
Larry Quigley
7,500

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.

Jon Romero
2,555

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.

Larry Quigley
7,500

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 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • engine hesitation when maintaining a speed 8 answers

    I have a 2003 grand marquis with 90,000 miles, when I am maintaining a speed I feel a jerking sensation. I thought it might be old spark plugs and an old fuel filter so I changed both of them out. But...

    2003 Mercury Grand Marquis LS Premium

    -

    Maintenance & Repair

  • 1996 Mercury Grand Marquis starting problem 3 answers

    1996 mercury grand marquis Starts fine all year except when it gets in the 30’s or below. First thing in the morning it will start and die, doesn’t matter if I hit the gas or not , then it restarts ...

    1996 Mercury Grand Marquis 4 Dr LS Sedan

    -

    Maintenance & Repair

  • 2004 Mecury GM power steerring "binds" when cold but is normal after engine warms up 2 answers

    We bought this Grand marquis used. We noticed that during cold weather the steering is stiff when starting a turn. The colder it gets the more resistance to starting a turn. Once the engine warms up t...

    2004 Mercury Grand Marquis LS Ultimate

    -

    Maintenance & Repair

  • 1986 mercury grand marquis 5.0 has a problem starting.What can possibly be wrong? 10 answers

    Only has problem in warm temperatures.1986 Mercury Grand Marquis 5.0 has a problem starting. After it is warmed up and turned off for 10 to 15 minutes fuel punp operates but, no fuel to engine. Car wi...

    1986 Mercury Grand Marquis

    -

    Maintenance & Repair

  • Starting problem in cold weather? 6 answers

    I have 03 Silverado HD. I'm having a hard time starting my truck in cold weather. When I start my truck it runs fine for around 4-5 minutes, than it starts missing and sometimes stalls. When I get the...

    2003 Chevrolet Silverado 2500HD 4 Dr LT 4WD Crew Cab SB HD

    -

    Maintenance & Repair

Grand Marquis
Looking for a Used Grand Marquis in your area?
CarGurus has 2,737 nationwide Grand Marquis listings starting at $1,500.
ZIP:

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 3,710
#2 kbro
kbro
Reputation 1,620
#3 FordNut
FordNut
Reputation 1,170
View All

Related Models For Sale

Used Ford Crown Victoria"
9 Great Deals out of 1,538 listings starting at $2,999
Used Lincoln Town Car"
41 Great Deals out of 2,449 listings starting at $995
Used Chevrolet Impala"
1,182 Great Deals out of 45,666 listings starting at $1,450
Used Ford Mustang"
357 Great Deals out of 47,577 listings starting at $2,495
Used Chevrolet Tahoe"
640 Great Deals out of 31,463 listings starting at $1,500
Used Honda Accord"
661 Great Deals out of 72,278 listings starting at $999
Used Ford F-150"
2,912 Great Deals out of 196,171 listings starting at $1,600
Used Cadillac DeVille"
11 Great Deals out of 2,421 listings starting at $1,000
Used Toyota Camry"
1,002 Great Deals out of 76,491 listings starting at $1,000
Used Ford Taurus"
201 Great Deals out of 20,773 listings starting at $950

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
48 listings starting at $12,000
2010 Mercury Grand Marquis For Sale
9 Great Deals out of 148 listings starting at $6,995
2009 Mercury Grand Marquis For Sale
4 Great Deals out of 153 listings starting at $3,500
2008 Mercury Grand Marquis For Sale
5 Great Deals out of 198 listings starting at $3,995
2007 Mercury Grand Marquis For Sale
5 Great Deals out of 205 listings starting at $3,300