96 f250 P0171&P0174 need help passes all vac test

Asked by Mar 19, 2016 at 04:02 PM about the 1999 Ford F-250 Super Duty XL LB

Question type: Maintenance & Repair

Don't see anything visually don't see anything wrong with live data passed all
vacuum test

4 Answers

395

Check mass air flow sensor ...as well possible ecm may need update ...

Mac passed mode 6 test how about a restriction like low flow injector but that shouldn't give me a lean condition in both banks a weak fuel psi regulator I'm leaning too

Sorry meant maf not mac

258,005

Those codes are classic lean codes, Unmetered air is being detected after the MAF. You said you did a vac test? I d perform a smoke test. Might be a small hose or gasket.

Your Answer

F-250 Super Duty

Looking for a Used F-250 Super Duty in your area?

CarGurus has 45,753 nationwide F-250 Super Duty listings starting at $1,700.

ZIP:

Ford F-250 Super Duty Experts

  • #1
    Tracy Hooks
    Reputation
    880
  • #2
    Tom Demyan
    Reputation
    680
  • #3
    kbro
    Reputation
    670
View All

Related Models For Sale

Used Ford F-350 Super Duty
334 Great Deals out of 25,495 listings starting at $3,700
Used Ford F-150
2,557 Great Deals out of 198,653 listings starting at $1,500
Used Dodge Ram 2500
154 Great Deals out of 5,064 listings starting at $2,200
Used Ford F-250
469 listings starting at $2,995
Used Chevrolet Silverado 1500
2,247 Great Deals out of 168,631 listings starting at $1,000
Used GMC Sierra 1500
1,001 Great Deals out of 65,795 listings starting at $1,975
Used Toyota Tundra
475 Great Deals out of 33,646 listings starting at $2,000
Used Dodge Ram 3500
72 Great Deals out of 2,200 listings starting at $5,750
Used Dodge Ram 1500
359 Great Deals out of 10,826 listings starting at $1,500
Used Ford F-450 Super Duty
42 Great Deals out of 2,789 listings starting at $8,950

Used Cars For Sale

2017 Ford F-250 Super Duty XL LB For Sale
749 listings starting at $21,431
2016 Ford F-250 Super Duty XL LB For Sale
23 listings starting at $21,967
2015 Ford F-250 Super Duty XL LB For Sale
8 listings starting at $19,000
2014 Ford F-250 Super Duty XL LB For Sale
10 listings starting at $12,450
2013 Ford F-250 Super Duty XL LB For Sale
29 listings starting at $12,500

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.