How to adjust Idle speed on 4.0 SOHC? | Ford Explorer Forums

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How to adjust Idle speed on 4.0 SOHC?

MasterP

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Joined
October 6, 2016
Messages
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City, State
Los Angeles
Year, Model & Trim Level
1998 Explorer Sport SOHC
I have tried playing with screw that controls throttle plate it does work at first allowing to reach 1200 rpm at idle however after stopping car and starting again it does go down to ~600rpm again like computer adjusts it back to desired level. There's also knob on Idle valve however turning it does nothing.

Is there way to reprogram computer to make 1200 a desired RPM?

Like try this yourself reach about 1200 rpm and then hold your leg still not looking at the rpm your once you hold it for a while it goes down to normal rpm, only way to hold constant 1200 RPM is to play with gas pedal.

P.S. I want to raise RPM to avoid misfire.
 






I have tried playing with screw that controls throttle plate it does work at first allowing to reach 1200 rpm at idle however after stopping car and starting again it does go down to ~600rpm again like computer adjusts it back to desired level. There's also knob on Idle valve however turning it does nothing.

Is there way to reprogram computer to make 1200 a desired RPM?

Like try this yourself reach about 1200 rpm and then hold your leg still not looking at the rpm your once you hold it for a while it goes down to normal rpm, only way to hold constant 1200 RPM is to play with gas pedal.

P.S. I want to raise RPM to avoid misfire.

1200 RPM is way to fast. 600 is correct. No, there is no way to adjust the idle. The PCM and IAC control the idle. The "knob" on the IAC is not a knob, it's the cover for it's air filter.
 






Master,

Fix the misfire, not the idle speed.

Is it throwing any codes?

EDIT.... I see you have another thread for the misfire....
 






i checked vacuum leak fuel pressure done injector cleaning 3 times and nothing helps must be head gasket or cracked head, i will drive it until it stalls then tow it home with AAA and swap engine when time comes.

Its on me what type of solution in implement i still looking for how to adjust idle if you got info please share.

This info is totally incorrect then? http://www.explorerforum.com/forums/index.php?threads/idle-adjustment-procedure.262930/
 






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