Saturn idle RPM changing according to speed - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 09-25-2007, 09:17 PM   #1
Registered Member
 
Join Date: Apr 2007
Posts: 245
Country: United States
Saturn idle RPM changing according to speed

I just picked up a 2000 Saturn SL. The idle speed will sit at 1200 if I am moving in neutral, if I come to a complete stop it will drop down to 5-800rpm. I was watching it and I think it keeps the rpm's higher when your speed is higher. Can anyone else confirm this? I was slowing from 30 and it was sitting at 1000 or so and then would make a sudden drop to 800 when my speed decreased to a certain point.

This doesn't seem so great for fuel economy, I guess I will be coasting without the engine running in the first place so this won't be too big of a deal.
__________________

__________________
Fourthbean is offline   Reply With Quote
Old 09-25-2007, 09:35 PM   #2
Supporting Member
 
cfg83's Avatar
 
Join Date: Sep 2006
Posts: 1,779
Country: United States
Fourthbean -

Quote:
Originally Posted by Fourthbean View Post
I just picked up a 2000 Saturn SL. The idle speed will sit at 1200 if I am moving in neutral, if I come to a complete stop it will drop down to 5-800rpm. I was watching it and I think it keeps the rpm's higher when your speed is higher. Can anyone else confirm this? I was slowing from 30 and it was sitting at 1000 or so and then would make a sudden drop to 800 when my speed decreased to a certain point.

This doesn't seem so great for fuel economy, I guess I will be coasting without the engine running in the first place so this won't be too big of a deal.
Yup, I think we had figured that the ECU/PCM keeps the idle higher at higher speeds. On my SW2, I am between 800 and 900 RPM while idling at a stop. On the freeway, when I glide in neutral, the RPMs are maybe 1100-1200.

CarloSW2
__________________

__________________
Old School SW2 EPA ... New School Civic EPA :

What's your EPA MPG? http://www.fueleconomy.gov/feg/calculatorSelectYear.jsp
cfg83 is offline   Reply With Quote
Old 09-25-2007, 09:37 PM   #3
Supporting Member
 
cfg83's Avatar
 
Join Date: Sep 2006
Posts: 1,779
Country: United States
Fourthbean -

Here's where we talked about it :

Idle speed control valve
http://www.gassavers.org/showthread.php?t=2852

CarloSW2
__________________
Old School SW2 EPA ... New School Civic EPA :

What's your EPA MPG? http://www.fueleconomy.gov/feg/calculatorSelectYear.jsp
cfg83 is offline   Reply With Quote
Old 09-25-2007, 09:38 PM   #4
Registered Member
 
1993CivicVX's Avatar
 
Join Date: Aug 2007
Posts: 1,066
Country: United States
Send a message via AIM to 1993CivicVX
On my VX it's the opposite. At speed it bounces up and down from 600 to 1300 and when I stop it will often rise 2000 and stay there. Odd thing is, it will only go to 2000 and stay there if the car had been cold when started. If you turn the car off and back on again, it will hover around 1200.
__________________
three stripes the charm!

Car mods are overrated. Just gotta adjust that nut behind the wheel for best mpg.



Forget about World Peace...Visualize using your turn signal.
1993CivicVX is offline   Reply With Quote
Old 09-25-2007, 10:10 PM   #5
Registered Member
 
GasSavers_Red's Avatar
 
Join Date: Nov 2006
Posts: 513
Country: United States
Send a message via MSN to GasSavers_Red
My TJ does that as well. If I'm coasting 30+MPH but under 60 MPH it will bump the idle up to 1200 RPM and it will bring down it down linearly with speed.
__________________
GasSavers_Red is offline   Reply With Quote
Old 09-25-2007, 10:15 PM   #6
Registered Member
 
Join Date: Apr 2007
Posts: 245
Country: United States
Ahh, so this seems to be a pretty standard feature with cars now a days. Makes sense really, I am sure it saves clutch wear for anyone who isn't careful to rev match when changing gears (like me sometimes).
__________________

__________________
Fourthbean is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuelly Android App - eehokie Fuelly Web Support and Community News 2 07-14-2010 09:59 PM
drivetrain resistance bagpipe goatee General Fuel Topics 9 09-14-2008 10:04 PM
Ethanol-gas mix is a problem for Franklin ketel0ne Automotive News, Articles and Products 8 08-26-2006 09:36 AM
Scangauge gets website upgrade ketel0ne General Fuel Topics 1 08-10-2006 06:52 PM
Make the page lengths 30 posts again, please SVOboy Fuelly Web Support and Community News 4 05-18-2006 01:43 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 12:34 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.