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Old 02-27-2007, 04:34 PM   #1
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Idle speed control valve

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You mean the connector to that little teeny RC looking motor? I was expecting something at least the size of 1/2 a beer can. That little golf ball sized thing is telling my 1.9L engine to idle faster and rob me of what, maybe 400 RPM and the subsequent GPH?!?!?!?!

I got a Mitchel On-Demand CD manual for Saturns for 10 bucks on Ebay, and I can't find any reference to this motor at all .

EDIT : Or is it actually an "idle control valve" like so :
This was under the FE updates and I didn't want to get to off topic for that thread. What is the purpose of the idle control valve? Is it sole function just for drivability issues or does it have something to do with emissions?

My engine usually takes 2.0 mile to reach operational temperature this time of year. At the 1.4 mile mark, which is a stop sign, I've increased my trip FE by 2.0 MPG at that point which stays the rest of the trip. It's almost as big a difference as with and without EBH. I've had no driveabilty issue at all except for the first 15 seconds you have to feather the gas to keep it from dieing after start in P. In D no problems at all. This comes out to around a 10% increase.
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Old 02-27-2007, 04:51 PM   #2
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What is the purpose of the idle control valve? Is it sole function just for drivability issues or does it have something to do with emissions?
The biggest reason I can see for having it is the driveability issues. I haven't had any problems except for the ones mentioned above about starting cold. The valve, I think, is mainly to keep the engine running fast enough to keep the battery charged when things like headlights, A/C, etc. were running.
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Old 02-28-2007, 01:17 PM   #3
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On my car the idle speed control valve is used to hold a steady idle so idle speed doesn't change as conditions change or as the motor and various sensors get older. It's also used to raise the idle speed when the engine is cold, raise idle when the car is moving so using the power brakes and power steering don't stall the engine, and to raise idle when A/C is used. In a nutshell it's all about driveability.
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Old 02-28-2007, 08:18 PM   #4
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My car will not run with the wire disconected, It will run if I keep pushing on the throttle but soon as I let up the engine dies.
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Old 02-28-2007, 08:23 PM   #5
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Quote:
Originally Posted by zpiloto View Post
What is the purpose of the idle control valve? Is it sole function just for drivability issues or does it have something to do with emissions?
My EGO sensor comes on line a lot quicker with a little more RPM so I think it is partly emission related.
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Old 02-28-2007, 08:30 PM   #6
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Originally Posted by ELF View Post
My car will not run with the wire disconected, It will run if I keep pushing on the throttle but soon as I let up the engine dies.
I'm guessing you have a solenoid instead of a motor. The motor type remembers it's position when it was disconnected, the solenoid tupe is pulsed and spring loaded in (in your case) the closed position.
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Old 02-28-2007, 10:14 PM   #7
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skewbe -

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Originally Posted by skewbe View Post
I'm guessing you have a solenoid instead of a motor. The motor type remembers it's position when it was disconnected, the solenoid tupe is pulsed and spring loaded in (in your case) the closed position.
I checked for the Saturn, and it is listed in the manual under solenoids.

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Old 03-01-2007, 12:51 AM   #8
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an IAC controls the Idle basicly. Its functions are slightly different in some cars. Some have a AC idle boost thats seperate. The computer wants the engine to idle at a programmed speed, It adjusts the IAC as needed.

In the carburator days it was just the throttle minimum screw, that kept the throttle open enough for it to idle (When cold the choke opens it more)
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Old 03-01-2007, 06:07 AM   #9
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skewbe -



I checked for the Saturn, and it is listed in the manual under solenoids.

CarloSW2
typo, impirical evidence and physical examinations shared here all point to it being a motor, and a rather goofy one at that.
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Old 03-01-2007, 06:53 AM   #10
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Quote:
Originally Posted by usedgeo View Post
My EGO sensor comes on line a lot quicker with a little more RPM so I think it is partly emission related.
What is an EGO sensor?
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