I just bought a 89 f150 xlt lariet, and when i start it it idles at 3 grand. Ive checked all my vacuum lines. they seem to be ok. Has anyone had this problem and if so how did you fix it?


Asked by Oct 02, 2013 at 09:42 PM about the 1989 Ford F-150 S Standard Cab SB

Question type: Maintenance & Repair

4 Answers


Check your idle speed control, it may have the plunger stuck open, also check minimum air rate, make sure someone hasn't cranked open the air valve in the throttle body.

Colin Rivet

idle air sensor

Tracy Hooks

No such thing Colin. Tennisshoes is right on track with this one. You have a large amount of air getting into the engine. Other sources are the Power Brake Booster and PCV. It's a big vacuum leak and shouldn't be that hard to find. 2 bolts to pull the IAC, you can clean it with carb spray and carefully move the plunger to see if it's free. Is the "Check Engine" light on?

Colin Rivet

idle air sensor or idle speed control ive hear them called both on different occasions,anyway I do agee with tennisshoes my comment was not meant to contradict his anser.ive had that part let go on me several times when I was running those old fords.sometimes in a jam u can clean it and get a few extra months out of them.

Your Answer

Add photo

Related Questions

  • if your truck cranks but will not start, what would be the problem? 95 answers

    STARTING PROBLEM I have a 2000 ford f150 5.4L the truck cranks but will not start some times. if i spray starter fliud into the booster in will start up. but other times the truck will start then just...

    2000 Ford F-150 Lariat Extended Cab SB


    Maintenance & Repair

  • 88 f150 4.9 straight 6 stalling when engine warm 4 answers

    I start the truck runs okay then when it gets warmed up the rpms start bouncing around give it gas to try to save it and it ends up sputtering out. fuel pumps are engaging already drained tank complet...

    1988 Ford F-150 XLT Standard Cab LB


    Maintenance & Repair

  • i have a 77 f150 that has a problem running when it is cold 53 answers

    77 f150 351v8 . i have to start it multiple times until it stops stalling then it runs fine once warmed up

    1977 Ford F-150


    Maintenance & Repair

  • My 84 f150 hesitates and stalls when I accelerate. 2 answers

    Iv rebuilt the carb. replaced the echoke plugs, roto and cap both fuel filters. Theres nothing bad in the vacuum lines that I or my buddies cane see. How do I fix it?

    1984 Ford F-150 STD Standard Cab LB


    Maintenance & Repair

  • i have a 1989 ford lariet xlt with a leaking fuel schraeder value 7 answers

    I have a 1989 Ford Lariet XLT that stalls out after driving 15 minutes. Took a look at the car while idle and discovered a leaking schraeder value. Will this cause a stalling problem.

    Ford F-150


    Maintenance & Repair


Looking for a Used F-150 in your area?

CarGurus has 217,270 nationwide F-150 listings starting at $1,000.


Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
Reputation 6,000
#2 dandyoun
Reputation 3,880
#3 tennisshoes
Reputation 2,300
View All

Related Models For Sale

Used GMC Sierra 1500"
1,048 Great Deals out of 56,524 listings starting at $2,300
Used Ford F-250"
614 listings starting at $3,995
Used Ford Mustang"
728 Great Deals out of 41,499 listings starting at $900
Used Ford Ranger"
266 Great Deals out of 7,818 listings starting at $988

Used Cars For Sale

2017 Ford F-150 For Sale
6,441 listings starting at $17,015
2016 Ford F-150 For Sale
152 Great Deals out of 138,649 listings starting at $16,985
2015 Ford F-150 For Sale
247 Great Deals out of 9,008 listings starting at $17,958
2014 Ford F-150 For Sale
506 Great Deals out of 10,965 listings starting at $10,450
2013 Ford F-150 For Sale
716 Great Deals out of 14,780 listings starting at $7,727