I have a 1989 Bronco II which has been converted with a 1997 Aerostar 4.0 Litre engine. For about the last year it has idled really high at about 1100-1200 RPM's which causes strain on the tranny and brakes. Now the idle is becoming erratic and going up to 2500-3000 and moving all around but still drives fine. Can someone help me.
1989 Bronco Ii Help
Started by
Guest_savvy5473_*
, Feb 24 2004 08:34 PM
2 replies to this topic
#2
kikenhorse
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Motor Man
- Location:New Brunswick Canada
- Interests:Restoring and updating by B2. Finding upgrade parts and acessories.. Having a good looking D.D.. The way Henry made it. I love the Cologne Motor.
Posted 27 February 2004 - 12:43 PM
Are you running it on the computer from the Bronco or Aerostar? Could make a diff!!! 
#3
Guest_Manimal_*
Guest_Manimal_*
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Posted 02 April 2004 - 02:00 AM
Before you do anything, try this:
Remove the Idle Air Control solenoid and clean it out thurougly with brake cleaner, carb cleaner, or whatever else you got. Make sure that you detach the actuating motor before you do this, so that you won't damage it, and so that you can tell when the plunger begins to move freely. If you don't know where the IAC is, it's a cylindrical assembly that is attached to the upper intake plenum.
Also, make sure that the two air conduates to and from the IAC solenoid aren't gunked up.
If this doesn't work, you need to start diagnosing the problem by using a EEC code reader, which you can purchase at almost any auto store, or department store with an auto section. Wal-Mart (aka Satan) sells it for $30.
You might also try setting the base idle. However, this will also screw with the throttle position sensor calibration. If you want to set the idle anyway, disconect the electrical connector from the IAC solenoid. Start the engine up, and adjust the throttle plate screw until the engine idles at 650RPM. TUrn off the engine, and plug the IAC back in. You might also want to reset the computer by unplugging the battery, so that the computer re-learns the idle curve.
Remove the Idle Air Control solenoid and clean it out thurougly with brake cleaner, carb cleaner, or whatever else you got. Make sure that you detach the actuating motor before you do this, so that you won't damage it, and so that you can tell when the plunger begins to move freely. If you don't know where the IAC is, it's a cylindrical assembly that is attached to the upper intake plenum.
Also, make sure that the two air conduates to and from the IAC solenoid aren't gunked up.
If this doesn't work, you need to start diagnosing the problem by using a EEC code reader, which you can purchase at almost any auto store, or department store with an auto section. Wal-Mart (aka Satan) sells it for $30.
You might also try setting the base idle. However, this will also screw with the throttle position sensor calibration. If you want to set the idle anyway, disconect the electrical connector from the IAC solenoid. Start the engine up, and adjust the throttle plate screw until the engine idles at 650RPM. TUrn off the engine, and plug the IAC back in. You might also want to reset the computer by unplugging the battery, so that the computer re-learns the idle curve.
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