Idle issues

Asked by Afstuve 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
157,465

Bob answered 7 years ago

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.

Mark helpful

karlwboswell answered 7 years ago

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.

Mark helpful

Your Answer:

Related Questions

  • ford f150 4x4 idle issues 2 Answers

    I have very eratic idle issues than truck shuts off. I have replaced the idle and throttle sensors. also have good fuel pressure. don't know what the problem is?

    1992 Ford F-150 STD 4WD Extended Cab SB

    -

    Maintenance & Repair

  • Idle issues 2 Answers

    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...

    2002 Ford F-150 XL SuperCab SB

    -

    Maintenance & Repair

  • Intermittent start issues, idle issues, powser issues 9 Answers

    My daughter has a 2002 Focus with automatic transmission. We have had several power/start issues and everytime we change something out it seems to fix the problem for a day or a week before it start...

    2002 Ford Focus ZTS

    -

    Maintenance & Repair

  • Sputtering while idle 2 Answers

    I recently changed my spark plugs on my 2002 f150 now its acting like it wants to die when idle what can be causing this??

    2002 Ford F-150 XLT Crew Cab 4WD SB

    -

    Maintenance & Repair

  • 1993 f150 4.9 issues 1 Answer

    My f150 only has about 160k miles on it but recently I've had some issues with it. I had to change the fuel pump a few months ago then the distributor right after that. Since the distributor got ...

    1993 Ford F-150 XL LB

    -

    Maintenance & Repair

Shortcuts

Search Ford F-150 Questions

CarGurus Experts

  • #1
    OJ
    Reputation
    41,830
  • #2
    Gene Arnett
    Reputation
    15,990
  • #3
    Rowefast
    Reputation
    15,480
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Silverado 1500
193 Great Deals out of 7,903 listings starting at $3,000
Used GMC Sierra 1500
123 Great Deals out of 8,182 listings starting at $3,000
Used Toyota Tundra
40 Great Deals out of 977 listings starting at $10,698
Used Ford F-250 Super Duty
30 Great Deals out of 797 listings starting at $2,890
Used Toyota Tacoma
44 Great Deals out of 740 listings starting at $9,975
Used Dodge RAM 1500
89 listings starting at $2,500
Used Ford Mustang
38 Great Deals out of 1,626 listings starting at $8,995
Used Ford Ranger
17 Great Deals out of 709 listings starting at $8,999
Used Chevrolet Silverado 2500HD
31 Great Deals out of 1,683 listings starting at $3,000
Used Jeep Wrangler
133 Great Deals out of 5,940 listings starting at $8,990
Used Ford Explorer
62 Great Deals out of 2,025 listings starting at $6,990
Used Toyota 4Runner
35 Great Deals out of 557 listings starting at $9,999
Used Chevrolet Tahoe
12 Great Deals out of 807 listings starting at $9,980

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. Content will be removed if CarGurus becomes aware that it violates our policies.