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Old 08/04/2005, 10:35 PM   #1 (permalink)
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idle screw stock position

does anybody know the stock position of the idle screw, I thought I read somewhere 1.5 turns out. Also, does more turns out mean higher idle? or is it the other way?
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Old 08/29/2006, 07:01 PM   #2 (permalink)
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Does anybody know the answer to this question? Any mitsubishi techs out there?
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Old 08/29/2006, 07:04 PM   #3 (permalink)
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Stock position is 1.5 turns out then reset your ECU. If you keep turning it out, it will raise your idle for a bit, but your ECU will compensate and lower your idle again. If you want to raise your idle, then you need to reflash your ECU.
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Old 08/29/2006, 07:12 PM   #4 (permalink)
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Setting that screw is tricky. I dont recommend anyone adjusting this screw. moving it without a MUT is useless and creates problems IMO. The Mitsubishi TB has the Throttle Position Sensor (TPS), the Idle Air Controller (IAC), and the Base Idle Set Screw (BISS). To correctly adjust the BISS, you need a Mitsubishi Diagnostic Scanner Tool, which only a dealer would have. The problem is that when you adjust the TPS and BISS, the computer compensates by moving the IAC all over the place. You ideally want to hold the IAC in it's center position while you adjust the BISS and TPS, which is what the Mitsubishi scanner does.

Here is the Factory Service Manual blurb...

BASIC IDLE SPEED ADJUSTMENT
M1131001800060
Required Special Tool:
MB991502: Scan Tool (MUT-II)
NOTE: The standard idling speed has been adjusted with the
speed adjusting screw (SAS), by the manufacturer. There
should be no need for readjustment.
NOTE: If the adjustment has been changed by mistake, the idle
speed may become too high or the idle speed may drop too low
when loads A/C, defogger, etc. are placed on the engine. If this
occurs, adjust by the following procedure.
NOTE: The adjustment, if made, should be made after first
confirming that the spark plugs, the injectors, the idle air control
motor, compression, etc., are all normal.
1. The vehicle should be prepared as follows before the
inspection and adjustment.
• Engine coolant temperature: 80 − 95° C(176 − 203°F)
• Lights, electric cooling fan and accessories: OFF
• Transaxle: Neutral ("P" range on vehicle with A/T)
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
2. Connect scan tool MB991502 to the data link connector (16-
pin).
NOTE: When scan tool MB991502 is connected, the
diagnostic test mode control terminal should be grounded.
3. Start the engine and run at idle.
4. Select the item number 30 of the scan tool Actuator test.
NOTE: Use the scan tool to hold the IAC motor at the basic
step to adjust the basic idle speed.

5. Check the idle speed.
NOTE: The engine speed may be 20 to 100 r/min lower than
indicated above for a new vehicle [driven approximately 500
km (300 mile) or less], but no adjustment is necessary.
NOTE: If the engine stalls or the engine speed is low even
though the vehicle has been driven approximately 500 km
(300 mile) or more, it is probable that deposits are adhered
to the throttle valve, so clean it. (Refer to P.13B-551)
Standard value: 700 + 50 r/min
6. If not within the standard value range, turn the speed
adjusting screw (SAS) to make the necessary adjustment.
7. Press the scan tool clear key, and release the IAC motor
Actuator test mode.
8. Turn the ignition switch to the "LOCK" (OFF) position.
NOTE: Unless the IAC motor is released, the Actuator test
mode will continue for 27 minutes.
9. Disconnect scan tool MB991502.
10.Start the engine again and let it idle for about 10 minutes.
Check that the idling condition is normal.

what to take away, 1.5 is not a magic #. it is bad info and could cause you issues if your particular car needs say 2.5. you have to prevent the IAC motor from moving when you adjust the screw else you arent really adjusting the air since the IAC will just adjsut itself to add/subtract the air volume you changed with the screw and if you max that out, you'll pop the SES code for IAC.
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Last edited by TheFranchise; 08/29/2006 at 07:33 PM.
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Old 08/30/2006, 11:08 PM   #5 (permalink)
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you seem to know your stuff..damn.. so i guess there's no way around it then. I'm gonna have to pay their 100 dollar diagnostic fee plus whatever bull crap they want to tack on...

Thanks to you know who you are..

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Old 08/31/2006, 09:18 AM   #6 (permalink)
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Read this thread, I have been messing with the SAS and finding some interesting effects. I will be posting an update today.

Fuel Trims and Idle Speed Adjustment
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Old 08/31/2006, 09:59 AM   #7 (permalink)
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Quote:
Originally Posted by TheFranchise
To correctly adjust the BISS, you need a Mitsubishi Diagnostic Scanner Tool, which only a dealer would have.
Now that they are using the MUT-III, isn't possible we could find some MUT-IIs on the market? SPX-OTC offers the MUT-III for 2 weeks rent, you have to call them reguarding the fee. They also sell them, but the only pricing I have seen is in a package deal that includes a laptop etc for $4,870.
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Old 08/31/2006, 10:04 AM   #8 (permalink)
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Quote:
Originally Posted by kurtz7485
Now that they are using the MUT-III, isn't possible we could find some MUT-IIs on the market? SPX-OTC offers the MUT-III for 2 weeks rent, you have to call them reguarding the fee. They also sell them, but the only pricing I have seen is in a package deal that includes a laptop etc for $4,870.

ya i almosted rented one from SPX for a test project.

honestly this may be the best use for the stealership to do work. only takes like 10min tops.

http://cgi.ebay.com/ebaymotors/GENUI...spagenameZWD1V
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Old 08/31/2006, 11:27 AM   #9 (permalink)
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Couldn't you use this proceedure (bottom of page 484) to manually set the IAC motor to center, and then leave it disconnected long enough to set the idle.

Last edited by rc_maniac; 08/31/2006 at 11:33 AM.
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