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Old 11-08-2007, 12:19 PM   #1
kruga225
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Default 2.5i Idle and Cold Weather Questions.

Just picked up my first Subaru about a month ago, its a 2007 2.5i slightly used with 17,000 miles. I've noticed that when idling, even after its warmed up, it seems to be a little rough. It idles around 500rpm and shakes a little bit when sitting at a stoplight or in a parking spot. My last car (2000 Sentra) idled around 1000rpm and was very smooth when idling, so I was just curious as to what everyone else's 2.5i idles at and if this is normal for these cars.

The previous owner had an after market remote starter installed on the car. It has worked fine up until yesterday when it was around 30 degrees during the night. I tried starting it, but for some reason it wouldn't start. I went out to start it by hand and it wouldn't turnover until I gave it some gas. Just wondering if anyone had experienced a similar problem with or without a remote starter in colder weather.

Any opinions, information or help would be greatly appreciated.

Thank You!
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Last edited by kruga225; 11-08-2007 at 12:40 PM.
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Old 11-08-2007, 12:32 PM   #2
Churro80
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Well I'll take a stab at this before the specialists and guru's chime in. It sounds like what you are describing at idle is the famous subaru shutter. Someone who knows more than me will probably correct me but I believe this slight shaking at start up and idle is just the nature of the boxer engine. My idle is around 500 also.

As far as the problem with the auto start I cant comment on, I've never had a problem with turning over after a cold night yet, and I dont have an auto-start on my car. Hopefully someone else will have some expierence with this and can give you some advice.
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Old 11-08-2007, 12:33 PM   #3
H-Dtech
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they all idle alittle rough, heard it can be cured with a grounding kit. I can't say for sure cause i havn't put one on my car yet. As far as the problem starting, subie batterys arn't they greatest things on planet and they do not like cold weather, mine was really sluggish last winter, and to install a remote starter they have to hack up the security system, so if they didn't install it right then that might be your problem. I'd say if you keep having the problem bring it to the dealership and have them yank the remote start out of the car. but all thats really up tp you.
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Old 11-08-2007, 12:54 PM   #4
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ibyourcaridlesaround700RPM.
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Old 11-08-2007, 01:05 PM   #5
ScubaruImpreza05
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I have the Big 3 done on my car (grounding kit) and the shudder is still existing. The shudder is the nature of the car idling. When the car is cold, the car will idle around 1200 RPMS and slowly fall over a 3-7 minute period until it will rest at its standard idle of about 750 RPMS.

Now onto the starting issue. I cannot speak from experience on the remote starter. I can however, tell you why you had to apply the gas and turn it over more. When your remote starter tried to start the car, it must have not turned it over just enough. You see, sometimes when I am impatient, I try to start the car really quickly. My car will start to fire, and I will stop turning the engine over just a hair to soon. The engine will stutter, almost idle, and then shut off. After which, it will take about 3 times as long to start (usually about 10-15 cranks depending on engine temperature). When i do get it turned over, it will stumble for a fraction of a second and then idle normally. I'm going to assume your starter has a programmed time interval for turning the engine over, and in this case it was not quite long enough.


*Note; the first line on the tachometer is 500 RPMS, not 0. Subaru cutoff the bottom 500 RPMS because well, your car should never idle there. So there really was no point to put it there and make the lines on the rest of the Tach that much smaller *
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Old 11-08-2007, 01:07 PM   #6
LetItSnow
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Bingo.
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Old 11-08-2007, 01:27 PM   #7
EvoSpeed
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I did not know that about the RPM's, thanks. I thought 500rpm was a bit low.
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Old 11-08-2007, 02:19 PM   #8
floyd the barber
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Quote:
Originally Posted by ScubaruImpreza05 View Post
My car will start to fire, and I will stop turning the engine over just a hair to soon. The engine will stutter, almost idle, and then shut off. After which, it will take about 3 times as long to start (usually about 10-15 cranks depending on engine temperature). When i do get it turned over, it will stumble for a fraction of a second and then idle normally.
If this does happen to the OP in conjunction with the remote starter, likely the car has flooded itself. This would cause the hard start condition afterwards, including the stumbling once it finally does re-start. I bet you also smell unburnt fuel and see some black smoke upon re-start.
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Old 11-08-2007, 03:02 PM   #9
kruga225
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Quote:
Originally Posted by LetItSnow View Post


Bingo.
I guess it does idles around 750rpm then, I just saw the hash mark in between 0 and 1 and figured it was 500rpm, I didn't know Subaru had set it up this way. So I guess it is idling properly, I just wasn't sure about it idling rough, but apparently its normal. Thanks for all the info.
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Old 11-08-2007, 03:20 PM   #10
EvoSpeed
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Yup they all idle kinda rough compared to other cars. And the engine almost has a "tick" kind of noise from the injectors. I have noticed that our Subie's react very harshly to weather changes. Anything over 85-90 degrees outside and you will notice that it starts to lose power; and when its under 50 it will start rough and idle rough until warm. I imagine that may be a factor as to why the ECU makes the car idle at 1500-1200 until warmed.

Its all normal, mine has done that off the lot.
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Old 11-08-2007, 03:53 PM   #11
Back Road Runner
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Mine's smooth...even with GroupN mounts. Even my last Forester idled smooth. I've test driven a few new/used Subarus and noticed no excess vibration

My bro's FXT idles rough though and will rock the car a little. He also recently found out he has a bent pulley too, which might be a contributor to it.

I can't say I've seen anybody care about it before. Our engines are naturally balanced via the flat 4 configuration, however that doesn't necessarily mean the parts are matched and balanced to each other.

The tick has been the primary comment point, and yes, it's normal and yes it can get loud. It gets louder as it gets colder and it can be loud enough where it sounds like something is broken. If it's cold enough outside, it won't go completely away either. My only suggestion is to let the car warm up before you get heavy on the engine. Although no one is quite certain why it ticks, no damage or excess wear has come from it.
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