94GTPRO5.0

I have a 94 gt and when I try to reset the base idle the RPM's jump up and down, the car surges and can get it to idle right, I have downloaded this page that tells you step by step, and have done it just the way it tells you to,and still cant get it right. Can anyone help me?
If joel5.0 or AdderMk2 has a better site that I could go to please tell me?
The car has flowmaster 44's CAI new 19lbs injectors, new TPS, MAF, and the IAC has been cleaned 2 time, and the Throttle body has a 92 style to screw,(some one took the
threaded rod out) but when I'm trying to reset the base idle I turn the 92 stylestop screw all the way out so the throttle cable don't even touch it,and do the adjustment by the allenhead screw in the throttle body. If anyone has had this same problem or someone could help me out please tell me.
This is the page that I downloaded thattells you how to do it
The base idle is nothing more than the idle that the computer has learned at whatever angle your throttle body is set at when at idle. This technically shouldn't change by itself but it's always good to check it because you never know what the dealer or previous owner did to the car before you had it.
Once you change the setting of the base idle you will definately want to go onto step 4 in this series of articles because if you move the base setting of the idle plate you also change the tps voltage at idle.

What is needed?
- Flathead screwdriver
- You'll also need a wrench to remove your battery cable

How to do it
1. Disconnect the battery's negative terminal to reset/clear the computer's memory. Leave it disconnected for 30 minutes. WARNING: Whenever removing your battery cables ALWAYS disconnect the negative battery cable first and reconnect it last. Otherwise you could destroy your computer or cause a battery explosion.
2. Disconnect the plug going to your idle motor which is located on the front of your throttle body.
3. Reconnect your battery's negative terminal.
4. Start the engine, and set the idle to the rpm you want with the stop screw on the bottom of the throttle body.
5. Turn off the engine.
6. Reconnect the plug on the idle motor
7. Make sure all accesories (radio, blower motor, a/c, lights, etc) are off and start the engine.
8. Let engine run for two minutes.
9. Turn engine off and wait two minutes then restart engine and let idle for two minutes with all accesories on.

EDIT: This article refers to "stop screw" on the throttlebody. We have noticed that on 94-95 (and probably 96-up) Mustangs don't have a stop screw but have a small piece of "threaded rod" (A) instead. This threaded rod can easily be turned with a pair of pliers to do the adjustment stated above. There are pictures below of this "threaded rod". Also note that the stop screw on fox body Mustangs are in the same basic place as the picture below (A)

94GTPRO5.0

Bump

camaroeater

That base idle relearn is fine...you might want to fix the screw and get it the way it supposed to be.

Joel5.0

Base Idle Reset Procedure

Since yours is a SN95, you also need to check the TB IAC bypass set screw..... which is the one with the rubber plug marked in the pic below.....


_____________VVVV

AdderMk2

Damn you joel and your links to SBF tech... im still banned over there

94GTPRO5.0

hahaha yea joel was a big help with the post about the base idle, and i was also adjusting with the TB IAC bypass set screw under the rubber plug,I got the car to idle and not surge, It is idling at 650 to 700 RPM's but when i go to check the overall timing with the spout in it isn't at 20 - 24* I cant even get a reading when i turn the timing gun idle to 30 or 35, so i think that my balancer might have spun. I think it is probable the original balancer. but the timing has to be right because i have no spark knock and i also have a air/fuel gauge AUTOMEATER and when at idle it shows that it is running alittle LEAN. Is that where it is suppose to idle at?

Joel5.0

Yep.... 650-700 rpms is OK.... and don't worry about getting an exact 20-24 deg. w/SPOUT in...... make sure initial is steady and that the timing advances when SPOUT is reconnected..... also make sure that balancer is not due for a replacement. LUK

94GTPRO5.0

awesome Thanks Joel5.0.