I have a 99 Ford Expedition that started running rough, checked the codes because it is showing check engine soon light, shows code for spark plug 4, took wire off put back on and erased the code
110

Asked by MarineMom Aug 29, 2015 at 04:51 PM about the Ford Expedition

Question type: Maintenance & Repair

my Ford Expedition is running rough, have replaced fuel filter, air filter, changed the oil. After running a scan it is showing with a P0304 code and when I looked that up it said misfire on number 4. I am fairly broke right now until payday next week and need to make an approximate 200 mile rt trek on Monday. Should I start with just one spark plug to see if that cures the problem? I cant really afford to buy all 8

4 Answers
15,935

Larry answered 9 years ago

You have done the troubleshooting, now replace the plug(s), Caution... if this is the 5.4 engine, the plugs are a bi..h. search YouTube for ford 5.4 replace sparkplugs and pay attention.

2 people found this helpful.
Mark helpful
110

MarineMom answered 9 years ago

lol thank you oldtimer37, its a 4.6 but I am getting someone to replace the plug for me, don't have the tools and right now cant afford to buy them. Thank you so much for the response, I am so thankful to have found this site, you and another person have been so helpful. Made me feel better that it isn't something serious

1 people found this helpful.
Mark helpful
159,355

Bob answered 9 years ago

The problem is likely one of the following...spark plug, spark plug boot, coil on plug or a fuel injector. How many miles on this vehicle and how many miles since the plugs were changed?

Mark helpful
110

MarineMom answered 9 years ago

Bob, about 8 months ago, however, it ran just fine until I got gas at a place that apparently is noted for watering down their gas. Didnt know they watered it down as I had just moved here. Think I will start with the sparkplug and see how it goes from there. I have tried changing out the fuel filter, checked the air filter, changed the oil and when running the codes it came out as the 4th sparkplug misfire

2 people found this helpful.
Mark helpful

Your Answer:

Related Questions

Expedition

Looking for a Used Expedition in your area?

CarGurus has 829 nationwide Expedition listings starting at $7,888.

Postal Code:

Shortcuts

Search Ford Expedition Questions

CarGurus Experts

  • #1
    Larry Sturgis
    Reputation
    5,310
  • #2
    T_S_T
    Reputation
    4,560
  • #3
    Gene Arnett
    Reputation
    2,730
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Tahoe
11 Great Deals out of 891 listings starting at $12,900
Used Chevrolet Suburban
10 Great Deals out of 583 listings starting at $10,900
Used Lincoln Navigator
6 Great Deals out of 169 listings starting at $9,869
Used GMC Yukon
14 Great Deals out of 904 listings starting at $4,555
Used Ford F-150
320 Great Deals out of 13,991 listings starting at $1,712
Used Ford Explorer
78 Great Deals out of 2,100 listings starting at $3,995
Used GMC Yukon XL
12 Great Deals out of 686 listings starting at $7,988
Used Toyota Sequoia
4 Great Deals out of 86 listings starting at $13,989
Used Cadillac Escalade
15 Great Deals out of 427 listings starting at $9,995
Used Ford F-250 Super Duty
18 Great Deals out of 1,178 listings starting at $8,995
Used INFINITI QX80
7 Great Deals out of 188 listings starting at $17,988
Used Chevrolet Traverse
38 Great Deals out of 553 listings starting at $3,995
Used Chevrolet Silverado 1500
222 Great Deals out of 5,872 listings starting at $2,975
Used Toyota 4Runner
15 Great Deals out of 301 listings starting at $9,995
Used Ford Excursion
2 listings

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. Content will be removed if CarGurus becomes aware that it violates our policies.