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Old 12-14-2017, 08:27 AM   #1
1.9 sohc
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2000 SL
Arrow Can I eliminate the higer idle that happens while rolling? (Manual trans)

I would like to have the car idle as if I was not rolling, even when I am rolling.
2000 SL, 5 speed.
If it is possible how would it be done?
Thanks

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Old 12-14-2017, 09:05 AM   #2
OldNuc
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Default Re: Can I eliminate the higer idle that happens while rolling? (Manual trans)

It is not possible. That is a baked in part of the emission control system.

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Old 12-14-2017, 09:44 AM   #3
rgrafton
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Default Re: Can I eliminate the higer idle that happens while rolling? (Manual trans)

you should be rolling in gear anyway most of the time

...
2002 SC1 5 speed 140k miles
1994 SL 5 speed 150k miles on engine (250k+ miles on car, tranny...etc.)

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Old 12-14-2017, 01:49 PM   #4
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Default Re: Can I eliminate the higer idle that happens while rolling? (Manual trans)

I’d say the higher idle is a transmission saver if your foot slips off the clutch pedal. Never considered it was for emissions.

Not sure if this applies. Okay, I know it doesn’t apply.
http://www.pilotodyssey.com/carb1.htm

...
Competition Clutch 10Lb. Flywheel. 13 stalls to date (and loving it)

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Old 12-14-2017, 03:20 PM   #5
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Default Re: Can I eliminate the higer idle that happens while rolling? (Manual trans)

Since this is a manual trans, how about putting a switch in the VSS circuit to disable the VSS signal? The cruise control will be inop, but that shouldn't matter if you don't intend to use the engine to power the car anyway. It will set VSS code(s), but do you care?

Oh, and I suppose traction control or ABS might get a bit confused. Try it and see...

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Old 12-14-2017, 03:21 PM   #6
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Default Re: Can I eliminate the higer idle that happens while rolling? (Manual trans)

Quote:
Originally Posted by bumpdraft View Post
I’d say the higher idle is a transmission saver if your foot slips off the clutch pedal. Never considered it was for emissions.

Not sure if this applies. Okay, I know it doesn’t apply.
http://www.pilotodyssey.com/carb1.htm
It helps process the exhaust while you glide before stopping at a light. Otherwise everyone would come to a stop and their pollutants from their higher power drive would process through at the light. The intersections would be a hotbed of pollitants.

-Robert

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Old 12-14-2017, 04:29 PM   #7
1.9 sohc
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Default Re: Can I eliminate the higer idle that happens while rolling? (Manual trans)

Quote:
Originally Posted by rgrafton View Post
you should be rolling in gear anyway most of the time
True but its higher when you are in gear too.
Maybe I shouldn't have mentioned geafrs.

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Old 12-14-2017, 04:31 PM   #8
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Default Re: Can I eliminate the higer idle that happens while rolling? (Manual trans)

Quote:
Originally Posted by billr View Post
Since this is a manual trans, how about putting a switch in the VSS circuit to disable the VSS signal? The cruise control will be inop, but that shouldn't matter if you don't intend to use the engine to power the car anyway. It will set VSS code(s), but do you care?

Oh, and I suppose traction control or ABS might get a bit confused. Try it and see...
My SL doesn't even have cruise. Or Traction control.
Does VSS matter for anything else?

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Old 12-14-2017, 05:32 PM   #9
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Default Re: Can I eliminate the higer idle that happens while rolling? (Manual trans)

You mean the speed sensor in the transmission? You don't have a speedo if you do that.

-Robert

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Old 12-14-2017, 06:44 PM   #10
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Default Re: Can I eliminate the higer idle that happens while rolling? (Manual trans)

All kinds of things quit working when the VSS is inop -- bad idea.

The high rolling idle is TERMINATED by the VSS signal, not initiated by it.

There is no way to defeat this feature as it is programmed into the emission control logic.

The issue here is what RPM are you seeing when you are in this throttle closed high idle while moving condition?

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Old 12-14-2017, 08:28 PM   #11
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Default Re: Can I eliminate the higer idle that happens while rolling? (Manual trans)

Terminating the "high rolling idle" is exactly what the OP wants to do. What else would cause a problem besides the speedo/odo if the VSS is disconnected?

OP, what do you want to do this for; to coast in neutral whenever possible to try for maximum fuel economy? Personally, I don't think that is worth the bother, but it's certainly your choice. If you want to do it, simply disconnect the VSS connector and see what happens. Ignore all the scare-mongering BS.

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Old 12-14-2017, 09:15 PM   #12
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Default Re: Can I eliminate the higer idle that happens while rolling? (Manual trans)

High idle is only terminated by the speed signal. It is iniated by throttle closed and vacuum.

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