01 Expedition 5.4 with P0171 and P0301 codes
20

Asked by taylormfdavis Apr 01, 2019 at 06:48 PM about the 2001 Ford Expedition Eddie Bauer 4WD

Question type: Maintenance & Repair

I have a 2001 Expedition with a 5.4 and
227,000 miles on it, been having all kinds of
misfire problems the past year. The latest is
it’s running lean on bank 1 and misfire on
cylinder 1. Put in new plug and coil on 1. Also
had a crack on PCV elbow so put in new
PCV valve and elbow, ran fine for about a
week then started misfiring again. Same
codes, P0171 and P0301. Checked for
vacuum leaks, cleaned Mass Airflow Sensor,
changed air filter and put in another new coil
and plug in 1. It’s not idling rough anymore
but shaking like hell when I’m 20-30 mph and
then smooths out once I get closer to 40
mph. Code hasn’t popped back up yet since
I unhooked battery to chang coil and plug.
Any ideas? I’m beyond stumped. Thanks!

2 Answers
42,415

Auto_Centric answered 5 years ago

Do a leak down test on engine not the old school compression test. Read about it https://shop.advanceautoparts.com/r/car-projects/leak-down-test-what-is-it-and-how-to-do-it Also with high miles the timing chain and VCT system is typically ready for rebuilding

1 people found this helpful.
Mark helpful

Your Answer:

Related Questions

Expedition

Looking for a Used Expedition in your area?

CarGurus has 821 nationwide Expedition listings starting at $7,888.

Postal Code:

Shortcuts

Search Ford Expedition Questions

CarGurus Experts

  • #1
    Larry Sturgis
    Reputation
    5,300
  • #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
24 Great Deals out of 911 listings starting at $11,900
Used Chevrolet Suburban
10 Great Deals out of 550 listings starting at $7,500
Used GMC Yukon
16 Great Deals out of 929 listings starting at $1,225
Used Lincoln Navigator
10 Great Deals out of 172 listings starting at $9,869
Used Ford Explorer
86 Great Deals out of 2,065 listings starting at $2,999
Used Ford F-150
321 Great Deals out of 14,968 listings starting at $1,712
Used GMC Yukon XL
14 Great Deals out of 683 listings starting at $13,950
Used Toyota Sequoia
4 Great Deals out of 69 listings starting at $16,489
Used Cadillac Escalade
21 Great Deals out of 376 listings starting at $6,900
Used Ford F-250 Super Duty
24 Great Deals out of 1,204 listings starting at $7,995
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.