1998 f 150 4x4 4.6 motor won't run over 40 mph. No check engine light.Check TPS checks ok.When you back off gas then push gas runs good up to 40 mph and will not run over 40 mph.

Asked by Aug 13, 2013 at 11:21 PM about the 1998 Ford F-150 XLT 4WD Extended Cab LB

Question type: Maintenance & Repair

2 Answers

check the operation of the EGR valve...is supposed to introduce exhaust gas into the combustion chamber if the ignition is too hot...perhaps this system should be checked for proper operation...your smog guy should be able to fix it~

27,565

I wouldn't be at all surprised if your Catalytic Converter is plugged. A simple check - unbolt the exhaust somewhere before the cat and take it for a (noisy) ride.

Your Answer

Ford F-150 Experts

  • #1
    OJ
    Reputation
    10,220
  • #2
    dandyoun
    Reputation
    4,840
  • #3
    tennisshoes
    Reputation
    3,670
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,869 Great Deals out of 150,892 listings starting at $1,495
Used GMC Sierra 1500
741 Great Deals out of 59,063 listings starting at $1,995
Used Ford F-250 Super Duty
383 Great Deals out of 42,396 listings starting at $1,600
Used Dodge Ram 1500
322 Great Deals out of 9,567 listings starting at $800
Used Toyota Tacoma
455 Great Deals out of 44,938 listings starting at $1,995
Used Ford Mustang
265 Great Deals out of 37,244 listings starting at $2,495
Used Ford F-250
407 listings starting at $2,300
Used Ford F-350 Super Duty
439 Great Deals out of 24,655 listings starting at $3,900
Used Ford Explorer
824 Great Deals out of 65,411 listings starting at $1,000
Used Chevrolet Tahoe
542 Great Deals out of 36,858 listings starting at $1,375

Used Cars For Sale

2018 Ford F-150 For Sale
92 Great Deals out of 139,290 listings starting at $8,260
2017 Ford F-150 For Sale
150 Great Deals out of 10,188 listings starting at $19,450
2016 Ford F-150 For Sale
211 Great Deals out of 8,953 listings starting at $14,500
2015 Ford F-150 For Sale
281 Great Deals out of 10,733 listings starting at $11,990
2014 Ford F-150 For Sale
431 Great Deals out of 11,813 listings starting at $7,995

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.