Idle issues

Asked by Jan 01, 2017 at 03:21 AM about the 2002 Ford F-150 XL SuperCab SB

Question type: Maintenance & Repair

I have a 2002Ford F150 and am having unsteady
idles urging when in drive and brake is applied,
stalling also when in drive and brake is applied
then released.  Have also noticed hissing from
front and rear of truck along with a pumping,
putting sort of noise as well. Not sure whether this
is a fuel pump issue, air flow sensor, vac. line leak,
or some other issue causing all of this.  Appreciate
any help that is given as I am able to perform
certain repair &maintenance on truck but am
limited in my mechanical skills.

2 Answers

54,445

It is possible that there is an issue with the power brake booster. The booster is supplied with vacuum from the intake manifold. This vacuum is used in the booster to amplify the pressure you put on the brake pedal when stopping. I would first locate the booster vacuum line that runs between the manifold and booster and make sure it is not cracked or otherwise degraded. If it looks good I would suspect a faulty brake booster and replace it. The loss of vacuum is likely the issue as to why it is not running correctly properly. The vacuum leak could be from somewhere else under the hood also.

I have the exact same truck with a 5.4l that has this issue. The plastic intake manifold is known to crack which causes a vacuum leak. Dorman makes a replacement manifold with upgraded O-ring gaskets for about $200. It takes a couple of hours for a home mechanic to replace it.

Your Answer

Ford F-150 Experts

  • #1
    OJ
    Reputation
    9,250
  • #2
    dandyoun
    Reputation
    4,620
  • #3
    tennisshoes
    Reputation
    3,250
View All

Related Models For Sale

Used Chevrolet Silverado 1500
173 Great Deals out of 9,782 listings starting at $1,700
Used GMC Sierra 1500
240 Great Deals out of 9,965 listings starting at $399
Used Ford F-250 Super Duty
31 Great Deals out of 802 listings starting at $6,857
Used Toyota Tundra
48 Great Deals out of 1,200 listings starting at $2,500
Used Dodge Ram 1500
40 Great Deals out of 498 listings starting at $3,488
Used Toyota Tacoma
37 Great Deals out of 1,017 listings starting at $5,999
Used Ford F-350 Super Duty
34 Great Deals out of 1,095 listings starting at $6,995
Used Ford Mustang
9 Great Deals out of 1,075 listings starting at $3,000
Used Chevrolet Silverado 2500HD
8 Great Deals out of 1,149 listings starting at $4,995
Used Chevrolet Tahoe
5 Great Deals out of 749 listings starting at $3,995
Used Ford Explorer
44 Great Deals out of 1,508 listings starting at $3,985

Used Cars For Sale

2018 Ford F-150 For Sale
4,245 listings starting at $28,465
2017 Ford F-150 For Sale
52 Great Deals out of 2,485 listings starting at $28,173
2016 Ford F-150 For Sale
98 Great Deals out of 854 listings starting at $22,950
2015 Ford F-150 For Sale
124 Great Deals out of 719 listings starting at $21,990
2014 Ford F-150 For Sale
108 Great Deals out of 514 listings starting at $13,800

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.