Why do the computers keep reading bad cylinder

Asked by Feb 22, 2017 at 08:12 PM about the 1998 Ford F-150 XL Extended Cab SB

Question type: Maintenance & Repair

I have a 98 Ford Triton 5.4 liter short bed three-
door truck. When I first got it I took it to the auto
shop and they said number 4 cylinder with bad. I
replaced number 4 cylinder plug and coil. Then I
took it back because it's still ran like crap and now
they're telling me it is 1 + 6. They said it could Be a
vacuum line or the computer. Has anyone had this
problem before and how can I fix it?

1 Answer

79,655

Some coil faults can migrate from one coil to another. It has happened to me. You can replace the coils one at a time or just replace them all.

Your Answer

Ford F-150 Experts

  • #1
    OJ
    Reputation
    9,090
  • #2
    dandyoun
    Reputation
    4,580
  • #3
    tennisshoes
    Reputation
    3,140
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,257 Great Deals out of 168,222 listings starting at $1,000
Used GMC Sierra 1500
997 Great Deals out of 66,241 listings starting at $2,495
Used Ford F-250 Super Duty
314 Great Deals out of 45,312 listings starting at $1,700
Used Dodge Ram 1500
359 Great Deals out of 10,824 listings starting at $1,500
Used Toyota Tacoma
575 Great Deals out of 44,300 listings starting at $2,200
Used Ford Mustang
589 Great Deals out of 36,206 listings starting at $1,200
Used Ford F-250
472 listings starting at $2,550
Used Ford F-350 Super Duty
344 Great Deals out of 25,132 listings starting at $2,488
Used Chevrolet Tahoe
722 Great Deals out of 41,409 listings starting at $1,995
Used Ford Explorer
915 Great Deals out of 67,921 listings starting at $1,495

Used Cars For Sale

2018 Ford F-150 For Sale
61,986 listings starting at $21,482
2017 Ford F-150 For Sale
128 Great Deals out of 60,362 listings starting at $17,990
2016 Ford F-150 For Sale
141 Great Deals out of 7,956 listings starting at $16,995
2015 Ford F-150 For Sale
358 Great Deals out of 11,527 listings starting at $15,591
2014 Ford F-150 For Sale
499 Great Deals out of 14,430 listings starting at $9,999

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.