Rough IDLE/Low IDLE no check engine light

savage21 · 11-19-2008, 02:13 PM

Notice the rough idle about a month ago and figured its was plugs so I changed them and the air filter and still idles rough and maybe low as well any ideas on what to check for next??

Thanks

Growser · 11-19-2008, 02:23 PM

Having a year, model of the car helps with replies. Have you replaced the temperature sensor for the coolent? Lots of running problems if it's not working. It's a cheap fix, and a common problem. The factory one is plastic and is known to crack. You should replace it with the new brass one. Go to the How To Library search for more information on the repair. It is also abreviated as ECTS. Check here for the video http://www.saturnfans.com/forums/sho...d.php?t=124184

savage21 · 11-19-2008, 02:47 PM

sORRY ITS A 2002 VUE 2.2L i WILL CHECK THE COOLANT SENSOR ANYTHING ELSE TO CHECK FOR

tHANKS

fdryer · 11-19-2008, 03:06 PM

Don't bother about the coolant sensor as it affected only the S-series cars until '01. Everyone else has the brass sensors already as GM/Saturn quietly figured this out before infecting the rest of the Saturn line.

You might have to consider a dirty throttle body needing some cleaning. Its always helpful to post all information at the beginning including mileage so 'twenty questions' are avoided.

savage21 · 11-19-2008, 03:20 PM

Something else I just remembered! It Idles rough except when cold and when its warmed up the rough idle can fluctuate sometimes and you actually see a drop in RPM then it recovers again but still idling rough

Its has around 96,000 miles

savage21 · 11-19-2008, 08:44 PM

Im really stuck on this one anyone else have any ideas

Joshtheclockman · 11-07-2010, 05:57 PM

Does the rpm drop and recover repeatedly? if it does its possible you may have a vaccume leak...

jhonky · 12-03-2010, 10:57 PM

might need a new thermostat

MerrittK54 · 12-07-2010, 07:28 PM

Savage21, you and I have the exact same problem. See my thread I started entitled "Throttle Valve Flutter". Except for Mr. Far2Grumpy, I can't get any feedback. The vaccum leak possibility that was suggested to you may be a good lead. Have you tried to diagnose your problem by checking for vacuum leaks?

bluesl2 · 12-08-2010, 01:27 AM

Do a compression test, or maybe partially plugged injector. What would be beneficial is to actually see the live data from the ecm for misfires if there are any.

11-19-2008, 02:13 PM	#1
savage21 New Member Join Date: Nov 2008 Posts: 4	Rough IDLE/Low IDLE no check engine light Notice the rough idle about a month ago and figured its was plugs so I changed them and the air filter and still idles rough and maybe low as well any ideas on what to check for next?? Thanks

11-19-2008, 02:23 PM	#2
Growser Advanced Member Join Date: Aug 2008 Location: New Prague, Minnesota Posts: 958 Growser's Photos 2002 SL2 2000 SL1	Re: Rough IDLE/Low IDLE no check engine light Having a year, model of the car helps with replies. Have you replaced the temperature sensor for the coolent? Lots of running problems if it's not working. It's a cheap fix, and a common problem. The factory one is plastic and is known to crack. You should replace it with the new brass one. Go to the How To Library search for more information on the repair. It is also abreviated as ECTS. Check here for the video http://www.saturnfans.com/forums/sho...d.php?t=124184 ... 7 Saturn Car Family with + 900,000 miles. 2002 SL2, 2000 SL1, 1997 SC2, 1997 SC1, 1996 SC1, 1994 SC2, and now a 93 SC2 project car.

11-19-2008, 02:47 PM	#3
savage21 New Member Join Date: Nov 2008 Posts: 4	Re: Rough IDLE/Low IDLE no check engine light sORRY ITS A 2002 VUE 2.2L i WILL CHECK THE COOLANT SENSOR ANYTHING ELSE TO CHECK FOR tHANKS

11-19-2008, 03:06 PM	#4
fdryer Super Member Join Date: Jan 2006 Location: NYC Posts: 45,934 fdryer's Photos 2003 L-Series 3.0L Sedan	Re: Rough IDLE/Low IDLE no check engine light Don't bother about the coolant sensor as it affected only the S-series cars until '01. Everyone else has the brass sensors already as GM/Saturn quietly figured this out before infecting the rest of the Saturn line. You might have to consider a dirty throttle body needing some cleaning. Its always helpful to post all information at the beginning including mileage so 'twenty questions' are avoided. ... VCX NANO

11-19-2008, 03:20 PM	#5
savage21 New Member Join Date: Nov 2008 Posts: 4	Re: Rough IDLE/Low IDLE no check engine light Something else I just remembered! It Idles rough except when cold and when its warmed up the rough idle can fluctuate sometimes and you actually see a drop in RPM then it recovers again but still idling rough Its has around 96,000 miles

11-19-2008, 08:44 PM	#6
savage21 New Member Join Date: Nov 2008 Posts: 4	Re: Rough IDLE/Low IDLE no check engine light Im really stuck on this one anyone else have any ideas

11-07-2010, 05:57 PM	#7
Joshtheclockman Member Join Date: Aug 2010 Posts: 52 1994 SL 2002 SL	Re: Rough IDLE/Low IDLE no check engine light Does the rpm drop and recover repeatedly? if it does its possible you may have a vaccume leak...

12-03-2010, 10:57 PM	#8
jhonky Senior Member Join Date: Jul 2010 Location: North Texas Posts: 1,109 jhonky's Photos 1998 SL2	Re: Rough IDLE/Low IDLE no check engine light might need a new thermostat

12-07-2010, 07:28 PM	#9
MerrittK54 Member Join Date: Dec 2004 Location: Lancaster, Ohio Posts: 57 2009 VUE 2.4L 2009 AURA XR	Re: Rough IDLE/Low IDLE no check engine light Savage21, you and I have the exact same problem. See my thread I started entitled "Throttle Valve Flutter". Except for Mr. Far2Grumpy, I can't get any feedback. The vaccum leak possibility that was suggested to you may be a good lead. Have you tried to diagnose your problem by checking for vacuum leaks? ... 2009 Aura XR 2.4L (Wife's) 2009 Vue XE 2.4L(Mine) 2002 L200 (Daughter's)

12-08-2010, 01:27 AM	#10
bluesl2 Master Member Join Date: Jul 2005 Posts: 2,037	Re: Rough IDLE/Low IDLE no check engine light Do a compression test, or maybe partially plugged injector. What would be beneficial is to actually see the live data from the ecm for misfires if there are any.

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