Can someone Help me fuel trims?
765

Asked by tdtony3 Apr 22, 2024 at 05:26 PM about the 1999 Ford Expedition 4 Dr Eddie Bauer 4WD SUV

Question type: Maintenance & Repair

I have a Expedition with a 5.4 engine. At idle my short term is -0 to - 4. & at Long term both banks read -14.
While I am driving my short term is +1 to -3.  My Long terms are at 0 & my mileage goes up. I have changed just about everything trying to figure this out.
Can someone please give me some insight on this?
Thanks!

3 Answers
160,495

Bob answered about a year ago

It is running rich at idle. Have you cleaned the mass airflow sensor? Is the engine air filter dirty? Are there any trouble codes?

Mark helpful
765

tdtony3 answered about a year ago

Hi, thank you for trying to help. As in my question I have done just about everything, Changed air & gas filter, cleaned maf, changed plugs, coils, boots & springs, injectors, egr valve, fuel pump, oxygen sensors, checked for vacuum leaks, pcv valve. I changed fuel pressure regulator & air valve a year ago, I am going to check these two again since it is happening only at idle. the Exp. runs great.

Mark helpful

Your Answer:

Related Questions

  • Can someone Help me fuel trims? 3 Answers

    I have a Expedition with a 5.4 engine. At idle my short term is -0 to - 4. & at Long term both banks read -14. While I am driving my short term is +1 to -3. My Long terms are at 0 & my mileage goes u...

    1999 Ford Expedition 4 Dr Eddie Bauer 4WD SUV

    -

    Maintenance & Repair

  • Help me out 5 Answers

    My 2015 ford expedition transmission will not got over 20 it will not change out can someone tell me wats wrong

    2015 Ford Expedition

    -

    Maintenance & Repair

  • Can changing fuel pump cause misfires on 2007 Expedition? 5 Answers

    I replaced the fuel pump and filter in my 2007 Expedition and immediately the next day got codes for misfires on cylinders 3 and 4. Could the fuel pump change have caused misfires? I thought perha...

    2007 Ford Expedition Eddie Bauer 4WD

    -

    Maintenance & Repair

  • Brought a new pcm but theft got it can you tell me how can i fix it? 1 Answer

    Quick question? I have a 2002 ford expedition that i took the motor and transmission out of and replaced it with a motor and transmission out of an 1998 ford expedition i was gone use the 98 comput...

    2002 Ford Expedition XLT

    -

    Maintenance & Repair

  • Can someone help me? 1 Answer

    Car starts fine and runs but after I drive to about 3 to 4 places it wont start up again and I have to wait for about 30 min then it will struggle to start then wait 10 more mins and it fires right...

    2005 Ford Mustang Convertible RWD

    -

    Maintenance & Repair

Expedition

Looking for a Used Expedition in your area?

CarGurus has 788 nationwide Expedition listings starting at $6,999.

Postal Code:

Shortcuts

Search Ford Expedition Questions

CarGurus Experts

  • #1
    Larry Sturgis
    Reputation
    5,320
  • #2
    T_S_T
    Reputation
    4,570
  • #3
    Gene Arnett
    Reputation
    2,730
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Tahoe
28 Great Deals out of 790 listings starting at $4,998
Used Chevrolet Suburban
16 Great Deals out of 434 listings starting at $17,995
Used Ford F-150
353 Great Deals out of 15,943 listings starting at $1,495
Used GMC Yukon
28 Great Deals out of 874 listings starting at $3,499
Used Lincoln Navigator
7 Great Deals out of 239 listings starting at $19,490
Used Ford Explorer
88 Great Deals out of 2,736 listings starting at $4,950
Used GMC Yukon XL
26 Great Deals out of 521 listings starting at $8,900
Used Cadillac Escalade
18 Great Deals out of 393 listings starting at $11,995
Used Chevrolet Silverado 1500
207 Great Deals out of 6,747 listings starting at $4,888
Used Ford F-250 Super Duty
29 Great Deals out of 1,310 listings starting at $7,900
Used Toyota 4Runner
34 Great Deals out of 744 listings starting at $12,999

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.