Welcome to the North American Subaru Impreza Owners Club Thursday April 19, 2018
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Subaru Models > Impreza Forum

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 06-10-2012, 09:26 PM   #1
greendesigns
Scooby Newbie
 
Member#: 318259
Join Date: Apr 2012
Chapter/Region: E. Canada
Location: eastern canada
Vehicle:
2012 Impreza
white

Default High idling at startup.

My 2012 Impreza seems to idle high at start up and the blue warning light is on. This lasts for about a minute or so. Does anyone have the same experience?
* Registered users of the site do not see these ads.
greendesigns is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 06-11-2012, 12:09 AM   #2
2012ruimpreza
Scooby Newbie
 
Member#: 316776
Join Date: Apr 2012
Location: Western North Carolina
Vehicle:
2012 Impreza hatch
Silver

Default

I know the high idle is 100% normal and all new imprezas do it, couldn't give you a text book reason why but don't fret it. The blue light is a engine temperature sensor indicator. Moms versa was the first car with one I seen. It simply means don't donkey stomp the car until the blue light goes off because the engine isn't up to operation tempature.
2012ruimpreza is offline   Reply With Quote
Old 06-11-2012, 01:01 AM   #3
jrands
Scooby Newbie
 
Member#: 176522
Join Date: Apr 2008
Chapter/Region: SCIC
Location: S. Cal
Vehicle:
2017 Forester XT
QBP

Default

I wouldn't worry about it. I believe it was addressed somewhere else here, maybe in the epic 2012 Impreza thread. Anyway, as 2012ruimpreza stated, it's normal. Mine idles high as well at the initial start up and also has the blue light. But after a few minutes (depending on ambient temp.), the blue light switches off. I believe the normal idle range in Park is about 600-800 rpms once the car is at normal operating temp. Mine is consistent with this as well.
jrands is offline   Reply With Quote
Old 06-11-2012, 01:33 AM   #4
somebody else
Scooby Specialist
 
Member#: 21618
Join Date: Jul 2002
Chapter/Region: SCIC
Location: southern California
Default

Quote:
Originally Posted by greendesigns View Post
My 2012 Impreza seems to idle high at start up and the blue warning light is on. This lasts for about a minute or so. Does anyone have the same experience?
Your car is operating absolutely correctly as designed.

If your car is operating correctly and as the engineers designed it, it will idle high and the cold temperature light will be on while in the initial stages of warming up a cold engine.

I like to wait for a minute at least until the first RPM drop (it drops in stages for a few minutes) but the reality is that I usually need to start driving now. So I take it very easy until the blue light goes out. That is simply being nice to your engine.
somebody else is offline   Reply With Quote
Old 06-11-2012, 06:16 AM   #5
suuichi
Scooby Newbie
 
Member#: 316952
Join Date: Apr 2012
Chapter/Region: MWSOC
Location: Ft. Riley Kansas
Vehicle:
2008 Impreza 2.5i
Dark Grey Metallic

Default

Hi, car engines are designed to idle high at start up for the sole purpose to get at operating temperature faster. The blue warning light which is also on my 08 impreza 2.5i is a safety to remind you to let the engine warm up before driving so to prolong the life of the engine. I like it cause its a good reminder for let's say your in a hurry and your not thinking about the fact the engine is still cold it's like a reminder light! Hope this helps.
suuichi is offline   Reply With Quote
Old 06-11-2012, 09:45 AM   #6
Zeeper
Scooby Specialist
 
Member#: 299286
Join Date: Oct 2011
Chapter/Region: NESIC
Location: Upstate NY
Vehicle:
2017 Legacy Limited
White

Default

I think the high idle has more to do with reaching the operating temperature more quickly to reduce vehicle emissions, as opposed to prolonging the life of the engine.

It is normal for the car to idle high and for the blue temp sensor to come on. Driving less aggressively for a few miles when you are starting out with a cold engine will be kinder to the engine, transmission, and drivetrain which all need to be lubricated -- but driving gently vs idling in the driveway is fine unless your driveway drops you onto a freeway.

Last edited by Zeeper; 06-11-2012 at 01:31 PM.
Zeeper is offline   Reply With Quote
Old 06-11-2012, 11:01 AM   #7
rgrwilco
Scooby Newbie
 
Member#: 308662
Join Date: Jan 2012
Location: Jersey
Vehicle:
2012 Impreza
Silver

Default

If I waited for that blue light to turn off, I would never get anywhere during winter. I usually let the engine run for about a minute then just go. And my driveway basically does drop me off on a highway, and I have never had any problems with any of my cars that I could attribute to that.

If you wanna wait, wait, but idling cars burn fuel very inefficiently and add to pollution, especially when every commuter idles their cars for ten minutes since they are too afraid of a little cold weather.

Edit: I meant every commuter in my neighborhood.
rgrwilco is offline   Reply With Quote
Old 06-11-2012, 11:48 AM   #8
somebody else
Scooby Specialist
 
Member#: 21618
Join Date: Jul 2002
Chapter/Region: SCIC
Location: southern California
Default

No one suggested you idle until the blue light goes off.

What you do not do is full-load drag racing with the blue light on.
The blue light is just a reminder to use common sense.
somebody else is offline   Reply With Quote
Old 06-14-2012, 06:34 PM   #9
damonhimself
Scooby Newbie
 
Member#: 235835
Join Date: Jan 2010
Chapter/Region: TXIC
Location: Austin, TX
Vehicle:
2011 WRX 5DR
DGM

Default

People, its like 700 RPMS over normal. Its not like its idling at 5k RPM cold.
damonhimself is offline   Reply With Quote
Old 06-15-2012, 08:12 PM   #10
greendesigns
Scooby Newbie
 
Member#: 318259
Join Date: Apr 2012
Chapter/Region: E. Canada
Location: eastern canada
Vehicle:
2012 Impreza
white

Default

Thanks everybody. I love the car.
greendesigns is offline   Reply With Quote
Old 06-19-2012, 12:54 AM   #11
pkL
Scooby Specialist
 
Member#: 313093
Join Date: Mar 2012
Chapter/Region: VIC
Location: Vancouver Area
Vehicle:
2012 Impreza 2.0i
5-door Sport. Dark Grey

Default

I had asked this question a while back and basically I was told that it would be the best to idle for 30 seconds from a cold start and keep the rpms under 3.5k until the light goes off. Idling until the blue light goes off is actually bad for the engine, transmission, and drivetrain.
pkL is offline   Reply With Quote
Old 05-22-2015, 12:00 PM   #12
MrOldLude
Scooby Newbie
 
Member#: 380724
Join Date: Feb 2014
Default

Resurrecting this one: How high is normal?

Our (2014 Impreza Premium w/ CVT) has had a fairly high cold-idle rev since we've had it.

This morning, it was at 2100 RPM and 64 degrees outside.

Is there any table to know what's reasonable here, or should I just take it in?

Thanks.
MrOldLude is offline   Reply With Quote
Old 05-22-2015, 12:28 PM   #13
Commander Keen
Scooby Specialist
 
Member#: 319157
Join Date: May 2012
Chapter/Region: MAIC
Vehicle:
2012 Impreza 4DR 5MT

Default

Completely normal, no cause for concern.
Commander Keen is offline   Reply With Quote
Old 05-22-2015, 07:37 PM   #14
soobie doo
Scooby Newbie
 
Member#: 324017
Join Date: Jun 2012
Location: Philly Burbs
Vehicle:
2012 Impreza 2.0i
Ice Silver Metallic

Default

Since this thread has been brought back from the dead, here's a related issue(?) that I've noticed lately:

Usually, during cold starts, the engine will idle at around 2k rpm at first We all know that by now. Recently, my car sometimes "stumbles" a bit after startup, then idles at more like 2500 rpm for a few seconds before settling in around 2k.
soobie doo is offline   Reply With Quote
Old 05-23-2015, 01:50 PM   #15
GarbageDay
Scooby Newbie
 
Member#: 371213
Join Date: Oct 2013
Location: DC Metro Area
Vehicle:
2013 Imp Spt Lmtd
Ice Silver Metallic

Default

Experiencing the same thing in my '13 subie hatch. Was worried as well. One morning it shot up to 2k rpm then down to 1k and then it slowly went down to 500. Operated fine though. Anyone else noticing their CVT struggle a bit when going from 0-40? It goes up to 3-3.5k rpm before switching.
GarbageDay is offline   Reply With Quote
Old 05-23-2015, 04:58 PM   #16
Commander Keen
Scooby Specialist
 
Member#: 319157
Join Date: May 2012
Chapter/Region: MAIC
Vehicle:
2012 Impreza 4DR 5MT

Default

Quote:
Usually, during cold starts, the engine will idle at around 2k rpm at first We all know that by now. Recently, my car sometimes "stumbles" a bit after startup, then idles at more like 2500 rpm for a few seconds before settling in around 2k.
I've seen it too, especially after clearing a CEL. My guess is the ECU is running as lean as it can get away with to reduce HCs in the exhaust.

It's not something I'm worried about at all.
Commander Keen is offline   Reply With Quote
Old 04-17-2018, 10:35 AM   #17
John451
Scooby Newbie
 
Member#: 321966
Join Date: Jun 2012
Location: Sydneys South, Australia
Vehicle:
2012 Impreza + XV 14
Black Pearl + White XV

Default

Have had a first cold start issue which on a cold morning caused the motor to drop to 1400 RPM jump to 2400 RPM then settle to 1800 with a slight misfire until warm, testing internal resistance with a FLUKE 17 found one Coil on Plug with a much higher internal resistance than the other 3, oddly the motor was still smooth while driving with no noticeable engine mis.

As reference Cold start with high resistance COP.

Cool morning first cold start after faulty COP was replaced with new part.


With the COP replaced the First Cold start on a cool morning is more stable and have noticed an improvement in fuel economy, can someone confirm the first cold start is back to normal in the video after COP replacement ?
John451 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
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
high idle at start up katt Newbies & FAQs 2 09-17-2009 08:27 AM
high idle at startup eXotek Normally Aspirated Powertrain 2 07-28-2009 12:22 PM
Idle fluctuating at startup and at a roll! Fuel cutoff at 5k.. joelikewhoa Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 9 02-28-2008 04:51 PM
High Idle At Startup sunchopper Service & Maintenance 5 09-25-2006 09:06 AM
High Idle at times subachad Normally Aspirated with bolt-on Forced Induction Powertrain 5 01-23-2004 12:30 AM

All times are GMT -4. The time now is 07:30 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2018 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.