Mustang idle surge and base idle reset - Page 3 - Forums at Modded Mustangs
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post #41 of 51 Old December 20th, 2010, 11:49 AM
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We have been getting many new users lately who don't seem to know the finer points of our rules.
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post #42 of 51 Old December 20th, 2010, 01:08 PM
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We have been getting many new users lately who don't seem to know the finer points of our rules.

What are you refuring to here?
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post #43 of 51 Old February 18th, 2011, 11:26 PM
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my 87 5,0 idles fine but when i plug in the iac it idles at like 1500 rpm would this work also the car at a cruise it miss fires or just acts like it stutters would this be the problem
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post #44 of 51 Old February 20th, 2011, 10:48 PM
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post #45 of 51 Old February 21st, 2011, 08:05 AM
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post #46 of 51 Old March 8th, 2011, 12:37 AM
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post #47 of 51 Old March 11th, 2011, 09:59 PM
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still having surging problems even after doing all the resets not sure where to go from here any suggestions
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post #48 of 51 Old July 26th, 2011, 10:52 PM
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idle surge/high,erratic idle

please help, what is the idle air bypass solenoid and where is it located? i have 1990 gt- 70mm t.b., k&n c.a.i., off road h pipe. 5 speed. on hot start it idles @ 2500 for 30 seconds, drops to 1500, then drops to 1000. once in a while it will drop to 600 and then surge back to 1000. read the tech tips about salt & pepper shakers and idle reset - very helpful. please help!!!
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post #49 of 51 Old June 15th, 2012, 10:19 AM
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got a code on the TPS, the part is $29, worth replacing and going with that or going through what you describe above?

I have replaced the IAC in the past 6 months b/c would not hold idle. Now the opposite, too high, will reset sometimes if I shut the car off.
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post #50 of 51 Old June 15th, 2012, 10:22 AM
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Idle issues are common on these cars, especially 5-speed cars. EGR Valves, Idle Air Bypass solenoids and Throttle Position Sensors are common causes. A bad connection with the 10 pin (salt and pepper shakers) black and white engine electrical connectors can also cause poor idle quality. To ensure a good connection on the 10 pin connectors a little modification can be done which is fairly easy and will cure some surging and hanging idle issues on 86-93 Mustangs and should be the first thing done when tackling any idle issues.

10 Pin Connector modification:

1. Take the 10 pin connectors apart (salt and pepper shakers).

2. use a pick like tool to spread the male terminals open more so they make better contact. In the center of each male terminal there is a small seam and seams down the sides of the terminal which allows you to spread them open.

3. Apply some dielectric grease to the terminals

4. Plug the connectors back in.



Throttle Position Sensor (TPS) adjustment:

Without the proper adjustment, the throttle position sensor (TPS) will give the computer false reading as to the exact throttle opening. A false reading will limit wide open throttle performance. A voltage reading must be taken using a digital volt/ohmmeter (DVOM) with the Key On/Engine Off and with the Key On/Engine Running.

The TPS is located directly on top of the throttle body and is adjusted by loosening the two phillips mounting screws and swiveling the sensor until the highest reading is found. It may be necessary to elongate the holes with a small drill bit or small file to achieve the desired reading. The spec range for Key On is from .88 to 1.0 volt; shoot for the .90 to .98 volt. Make sure voltage reaches/exceeds 2.71v at WOT.

Incorrect Throttle Position Sensor (TPS) voltage will result in reduced performance including a possible hanging/surging idle. The best way to take a TPS voltage reading is by using two safety pins through the wires coming from the sensor. The positive lead is attached to the green wire, while the negative goes to the black wire. Always ground the meter through the sensor's black wire. This gives a direct, and more
accurate ground into the computer.



Resetting the base idle:

Clear the computer's idle memory by disconnecting the battery for 20+ minutes.

-Disconnect the Idle Air Bypass solenoid
-Reconnect battery
-Start engine and set idle speed to desired RPM with idle screw on throttle body
-Turn off engine and reconnect the air bypass solenoid
-Set TPS voltage between 0.90 - 0.95 volts with a digital volt meter
-Start engine and let it idle for 2 minutes with no accessories on.
-Turn off engine for two minutes
-Start engine again and run for 2 minutes with every accessory turned on.
-Turn engine off again.
Got a TPS code pop up yesterday, idling high. Replaced IAC 6 months ago b/c wouldn't hold idle. Replace TPS? Part is $29 or go through above. Been awhile since i have used my voltmeter.
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post #51 of 51 Old June 15th, 2012, 12:34 PM
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Originally Posted by 90fastang View Post
my car was good and then all of a suden it idled at 3000 and it wouldnt drop, wat would it be??
Vaccum leak maybe

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