Idle problem how do you set the idle speed on a 2003 sport trac, 4.0 v6 when starting it goes up to about 2000 rpm then back to about 500 rpm, much to high? thanks tom

it's supposed to do that as the choke is working to warm the vehicle, when it warms up to operating temperature the choke goes off

Adjust the idle revs when the car is in either neutral or park. (2000 rpm is too fast for idle speed).If it is a late model car and therefore has a computer system then what ever you do DON'T TOUCH THE IDLE SCREW. You'll throw everthing out of whack. It needs to be done via a computer. Hope this helps

First thing would be to replace the fuel filter. Then spark plugs. You may have a weak fuel pump. A faulty fuel pressure regulator could also cause this.

Check the fuel pressure it could be the fuel pump or pressure regulator.

This is very likely your idle air control valve. Common problems with ford motors in my experience.

Have you tried cleaning the throttle plates and idle air control motor

Hello,
Very common concern with the Explorer, Explorer Sport Trac and Ranger with the 4.0l SOHC engine! The upper and lower intake manifold gaskets fail, causing vacuum leaks..It can be Extremely difficult to detect these leaks, because they only leak intermittently (usually in the AM after a cold soak)... As the engine warms up they seal back up! Sometimes the vehicle will idle rough, surge or stall after initial start up, then the symptoms will clear after it gets to operating temperature... Usually there will be no driveability symptoms at all, except the engine light coming on and setting lean codes.. The gaskets have been redesigned to correct this concern..


Bill Andrade Ford Master Technician/ASE Master Technician

ck voltage from alt

your plug wires are crossed. your close but you have 2 wires in the wrong place.the coil has numbers on it. 123456 i think from the belt going back the pass side first 123 and driver side 456 or vise versa you will know if the versa part is wrong. good luck.