%.0 idel speed

alaska1 · 10-23-2001, 03:47 PM

I reciently purchased an 87 GT. The problem is the idle is around 1200. any ideas on how I can get it down to the recommended Idel RPM. The air box has been removed. Thanks In advance. Max

exgmguy · 10-23-2001, 03:57 PM

Here goes...

Disconnect the battery for 20 minutes. Unplug the idle air motor. It is on the side of the throttle body, facing the front of the car. It is tube shaped.

Start the car and set the idle with the idle speed screw (on the other side of the throttle body) to 600 rpm.

Now adjust the throttle position sensor. It is held by 2 phillip screws on the top of the throttle body. You need to probe the green+ and black- wires with a digital voltmeter. Slightly loosen the 2 screws on the sensor and adjust it to read about .95 volts. Recheck the voltage after you tighten the screws down.

Shut the car off, plug the Idle air motor back in and start the car, idling with all electrical accessories on for 2 minutes. Shut it off for 2 minutes. Restart the car again and let it idle for 2 more minutes with no accessories on.

This is how you completely reset the computer correctly. You can drop the idle by simply adjusting the idle screw, but this is the correct way to do it.

------------------
1988 Mustang GT
11.8 @ 123 (7/14/01)
11.5 @ 120 (9/14/01)
1992 BadAzz Wrangler
1993 Explorer

See my car at: www.mustangworks.com/cgi-bin/moi-display.cgi?179

PKRWUD · 10-23-2001, 04:19 PM

exgmguy-
Done this before, have you?

Take care,
-Chris

------------------
Retired Moderator
MustangNet

My site: Peckerwoods Pit Stop

My teams site: Jim Porter Racing

RACECAR spelled backwards is RACECAR

HEY !!! Are you ASE Certified ??? If you are, ask me about iATN.

jmel · 10-24-2001, 10:41 AM

That will work---assuming there is no underlying problem with the EEC system. I once had a faulty ISC-BPA that caused the idle to stay constant at 1200 rpm. Check your EEC codes, first. If there is no problem, than reset your idle speed using the set screw. You got to wonder how it got messed up in the first place. jake

10-23-2001, 03:47 PM	#1
alaska1 Registered Member Join Date: Oct 2001 Location: Grand Haven, MI 49417 Posts: 1	%.0 idel speed I reciently purchased an 87 GT. The problem is the idle is around 1200. any ideas on how I can get it down to the recommended Idel RPM. The air box has been removed. Thanks In advance. Max

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10-23-2001, 03:57 PM	#2
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	Here goes... Disconnect the battery for 20 minutes. Unplug the idle air motor. It is on the side of the throttle body, facing the front of the car. It is tube shaped. Start the car and set the idle with the idle speed screw (on the other side of the throttle body) to 600 rpm. Now adjust the throttle position sensor. It is held by 2 phillip screws on the top of the throttle body. You need to probe the green+ and black- wires with a digital voltmeter. Slightly loosen the 2 screws on the sensor and adjust it to read about .95 volts. Recheck the voltage after you tighten the screws down. Shut the car off, plug the Idle air motor back in and start the car, idling with all electrical accessories on for 2 minutes. Shut it off for 2 minutes. Restart the car again and let it idle for 2 more minutes with no accessories on. This is how you completely reset the computer correctly. You can drop the idle by simply adjusting the idle screw, but this is the correct way to do it. ------------------ 1988 Mustang GT 11.8 @ 123 (7/14/01) 11.5 @ 120 (9/14/01) 1992 BadAzz Wrangler 1993 Explorer See my car at: www.mustangworks.com/cgi-bin/moi-display.cgi?179

10-23-2001, 04:19 PM	#3
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	exgmguy- Done this before, have you? Take care, -Chris ------------------ Retired Moderator MustangNet My site: Peckerwoods Pit Stop My teams site: Jim Porter Racing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN.

10-24-2001, 10:41 AM	#4
jmel Registered Member Join Date: Sep 2001 Location: Middletown, Ohio 45042 Posts: 33	That will work---assuming there is no underlying problem with the EEC system. I once had a faulty ISC-BPA that caused the idle to stay constant at 1200 rpm. Check your EEC codes, first. If there is no problem, than reset your idle speed using the set screw. You got to wonder how it got messed up in the first place. jake