Stalling when A/C turned on

Asked by Lukebro Aug 17, 2016 at 10:50 PM about the 1987 Ford F-150 STD Standard Cab SB

Question type: Maintenance & Repair

I have a 1987 ford f150 4.9L straight 6. My truck
idles fine when the a/c is off but as soon as I push
the button to turn on the a/c it dies only at idle.
When I go down the street or high way it works
great. But when I stop it does. I have cleaned the
idle air control valve and throttle body and the
truck runs better but has the same issue with the
a/c. I've been researching this issue and still
haven't found anything on this. Does anyone have
any idea whats going on here?

2 Answers

70,875

is the a/c solenoid clocking on?? > www.google.com/search? q=1987+Ford+F- 150+a/c+solenoid&espv=2&biw=1024&bih=729&source=lnms&tbm= isch&sa=X&ved=0ahUKEwiWqIuf_snOAhWG7CYKHZdMBskQ_AUIB ygC#tbm=isch&q=1987+Ford+F-150++a%2Fc++idle+solenoid

1 people found this helpful.
58,515

Another condition I have seen is with an aftermarket AC system installed. There is nothing to signal the PCM that there is an additional load. You may be able to reset the Idle parameters after cleaning the Throttle body and plate. The proper way is to disconnect the Battery - clean the Throttle Body - Reconnect the Battery - Start and run the Engine at 2500 RPM until Operating Temperature (about 3 Minutes) - Allow the vehicle to Idle In Drive for about 2 minutes - Allow the Engine to Idle In Drive with all accessories (including the AC and Headlights) on for an additional 2 minutes. You are re-teaching the PCM how to Idle under different conditions.

Your Answer:

F-150

Looking for a Used F-150 in your area?

CarGurus has 15,343 nationwide F-150 listings starting at $1,954.

Postal Code:

CarGurus Experts

  • #1
    OJ
    Reputation
    42,480
  • #2
    Gene Arnett
    Reputation
    16,040
  • #3
    Rowefast
    Reputation
    15,840
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used GMC Sierra 1500
131 Great Deals out of 6,881 listings starting at $3,975
Used Ford F-250
6 listings
Used Ford Ranger
14 Great Deals out of 1,454 listings starting at $2,888
Used Ford Mustang
55 Great Deals out of 1,260 listings starting at $4,995

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