1999 f250 sd v10. Getting po172 and po174 fuel trims out of wack. I have replaced iac tps cps fuel pump hoses the seemed bad no air leaks that I could find. Clean mas. Also tranney dot shift right


Asked by Nov 16, 2013 at 09:54 PM about the 1999 Ford F-250 Super Duty XLT 4WD Crew Cab LB

Question type: Maintenance & Repair

I ordered a new mass I don't know what the maf should read at idle.  What else would
cause the fuel trims to be off. New o2 sensors.    Seems to run better with the mass low
unpluged. At least the bank 1 and 2 sensor 1 will switch rich lean.  When pluged in is
where the freeze.  And get 172 and 174 codes.  And during the koer test I get the iac
malfunction. Been replaced 2 times .

2 Answers


Rich on both banks. Coolant temp.sensor or fuel pressure regulator.


Rear speed sensor in rear end or transmission filter dropped down.Change filter and fluid drain torque converter.

Your Answer

F-250 Super Duty

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

CarGurus has 47,758 nationwide F-250 Super Duty listings starting at $1,700.


Ford F-250 Super Duty Experts

  • #1
    Tracy Hooks
  • #2
    Tom Demyan
  • #3
View All

Related Models For Sale

Used Ford F-350 Super Duty
396 Great Deals out of 27,113 listings starting at $3,900
Used Ford F-150
2,943 Great Deals out of 230,828 listings starting at $1,300
Used Dodge Ram 2500
159 Great Deals out of 5,332 listings starting at $2,999
Used Chevrolet Silverado 1500
2,597 Great Deals out of 157,672 listings starting at $1,500
Used Ford F-450 Super Duty
45 Great Deals out of 2,413 listings starting at $9,500
Used Ford F-250
425 listings starting at $2,500
Used GMC Sierra 1500
1,084 Great Deals out of 61,732 listings starting at $1,295
Used Dodge Ram 3500
74 Great Deals out of 2,251 listings starting at $5,950
Used Ford Mustang
332 Great Deals out of 41,500 listings starting at $1,488
Used Toyota Tundra
611 Great Deals out of 36,207 listings starting at $1,500

Used Cars For Sale

2018 Ford F-250 Super Duty For Sale
16,044 listings starting at $23,600
2017 Ford F-250 Super Duty For Sale
19 Great Deals out of 14,184 listings starting at $22,417
2016 Ford F-250 Super Duty For Sale
44 Great Deals out of 2,359 listings starting at $16,995
2015 Ford F-250 Super Duty For Sale
33 Great Deals out of 2,468 listings starting at $15,864
2014 Ford F-250 Super Duty For Sale
6 Great Deals out of 1,118 listings starting at $12,988

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.