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  '79 to '93 -- The Fox Mustang
  HOW TO ADJUST IDLE ON 1992 MUSTANG 5.0

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Author Topic:   HOW TO ADJUST IDLE ON 1992 MUSTANG 5.0
derrickandkara
Journeyman

Posts: 16
From: lowell in , usa
Registered: Jul 2004

posted 05-07-2005 01:44 AM     Click Here to See the Profile for derrickandkara   Click Here to Email derrickandkara     Edit/Delete Message   Reply w/Quote
HOW TO ADJUST IDLE ON 1992 MUSTANG 5.0 ITS IDLE REAL LOW AT LIKE .50 ON THE TAC. HOW DO I ADJUST THE IDLE ON THI SMOTOR I AM NEW TO THE 5.0 AND FORD MOTORS FOR MATTER

THANKS ALOT GUYS

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wesred90gt
Journeyman

Posts: 64
From: joliet I L
Registered: Jun 2003

posted 05-07-2005 10:49 PM     Click Here to See the Profile for wesred90gt   Click Here to Email wesred90gt     Edit/Delete Message   Reply w/Quote
on the side of the throttle body is a idle adjustment screw start the car up and use a flat head screwdriver and turn it slowly til you reach the desired idle u want.

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derrickandkara
Journeyman

Posts: 16
From: lowell in , usa
Registered: Jul 2004

posted 05-08-2005 12:33 AM     Click Here to See the Profile for derrickandkara   Click Here to Email derrickandkara     Edit/Delete Message   Reply w/Quote
which way do i turn it to raise the idle in or out ??

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derrickandkara
Journeyman

Posts: 16
From: lowell in , usa
Registered: Jul 2004

posted 05-08-2005 12:35 AM     Click Here to See the Profile for derrickandkara   Click Here to Email derrickandkara     Edit/Delete Message   Reply w/Quote
also whats a good idle 1 on th etach 1 rpm ??

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wesred90gt
Journeyman

Posts: 64
From: joliet I L
Registered: Jun 2003

posted 05-08-2005 07:37 PM     Click Here to See the Profile for wesred90gt   Click Here to Email wesred90gt     Edit/Delete Message   Reply w/Quote
turn the idle screw in and u will hear the idle go up set it anywhere between 900 to 1000 rpm

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ddenton749
unregistered
posted 05-09-2005 01:37 PM           Edit/Delete Message   Reply w/Quote
Forgive me for sounding like a smarta$$, but you DON'T adjust the idle on a '92 5.0. The computer sets the idle speed by way of the Idle Air Control Valve. The IACV is the cylindrical device on the front of your throttle body with an electrical plug on it.

While there is a idle speed set screw, that's only for setting the idle in the case that the IACV fails. If the IACV is working properly, you will get a high idle on cold start, then it will drop to normal idle speed when the engine warms up. If the IACV is not working, try cleaning it with carb cleaner making sure the piston inside is free to move, or replace the unit. ($100+)

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club
"Tank, I need an exit."
"I may not have gone where I intended to go, but I think I have ended up where I needed to be."
AIM, YM: topdnmustang

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derrickandkara
Journeyman

Posts: 16
From: lowell in , usa
Registered: Jul 2004

posted 05-09-2005 05:12 PM     Click Here to See the Profile for derrickandkara   Click Here to Email derrickandkara     Edit/Delete Message   Reply w/Quote
i IACV is working the idle does rise untill motor warms up and then drops to a way to low 500 rpm. i turned in the idle stop screw just a little so when it drops down it doesnt go past .800 rpm no the car idles perfect.

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ddenton749
unregistered
posted 05-10-2005 08:00 AM           Edit/Delete Message   Reply w/Quote
There's something wrong with the IACV or one of the sensors that tells the computer engine temp, etc. (Do you have any trouble codes?) The IACV should control the idle speed at all times. Try removing the IACV and give it a good cleaning with carb cleaner.

When I first got my Fox the IACV was clogged with oil coming from the breather tube between the valve cover and the throttle body. This was because the PVC filter screen was completely clogged causing oil/crankcase vapors to back up into the throttle body and into the IACV.

I have never touched that idle screw on my 5.0 or my 4.0 Explorer.

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club
"Tank, I need an exit."
"I may not have gone where I intended to go, but I think I have ended up where I needed to be."
AIM, YM: topdnmustang

[This message has been edited by ddenton749 (edited 05-10-2005).]

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