My 87 Ford F150, 300 str 6 will start and idle just dandy on a cold start.. After warmed up, I turn it off, restart, and the idle varies from 1500 down to 500 for about 20 seconds, then is fine. I was told it was the map sensor. I replced it, and it still does it. And today, after settling into it's normal idle, I pulled out and about 100 feet later it just plain stopped running. After sitting for about 15 minutes, it fired right up and ran fine. ANY IDEAS????

Asked by Apr 05, 2014 at 04:38 PM about the 1987 Ford F-150

Question type: Maintenance & Repair

1 Answer

100,615

Check the throttle body for crud in the body and the plate, clean it if dirty, then remove the IAC valve and clean it, then reinstall, disconnect the battery negative terminal, turn on the headlights and wait 30 seconds, turn off the headlights, reconnect the battery, start engine and drive as you normally do, this will relearn the computer, this is an old Ford OBD 1system so if it causes any thing further you may have to find a shop that can run a diagnostic on it. You migh consider replacing the fuel filter, if it is partially plugged on that engine you might not get enough flow through the fuel rail to prevent vapor lock.

1 of 1 people found this helpful.

Your Answer

Ford F-150 Experts

  • #1
    OJ
    Reputation
    8,960
  • #2
    dandyoun
    Reputation
    4,550
  • #3
    tennisshoes
    Reputation
    3,090
View All

Related Models For Sale

Used GMC Sierra 1500
875 Great Deals out of 65,134 listings starting at $2,495
Used Ford Mustang
692 Great Deals out of 37,616 listings starting at $895
Used Ford F-250
471 listings starting at $4,000

Used Cars For Sale

2018 Ford F-150 For Sale
36,319 listings starting at $19,355
2017 Ford F-150 For Sale
123 Great Deals out of 76,890 listings starting at $17,989
2016 Ford F-150 For Sale
117 Great Deals out of 7,730 listings starting at $18,989
2015 Ford F-150 For Sale
302 Great Deals out of 10,794 listings starting at $15,995
2014 Ford F-150 For Sale
431 Great Deals out of 13,764 listings starting at $10,995

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.