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Old 01-02-2002, 06:20 PM   #1
chilipepper
Scooby Newbie
 
Member#: 13140
Join Date: Dec 2001
Location: Dickinson, ND
Vehicle:
2002 WRX Wagon
Silver

Default Rough Idle? Any ideas? Normal?

I have a 2002 WRX with about 1400 miles on it now and I noticed in the last 600 miles or so I really started noticing that there was a slightly rough idle. It really is noticable when the engine is warm and the idle settles down to the 700 rpm range. When it is cold it isn't as prominent except under more than average load (taking a large hill in the road, etc.). It is a 5-speed WRX. The idle is actually rough enough to make the car actually shudder when you are sitting at stop lights.

I've been reading all of the engine noise posts and I do notice some engine noise but mostly the ticking sound which seems to be injector noise.

Another thing that I noticed and am not sure if it is normal or not, is that there is a bit of a rough engine vibration at about 2500 to 3200 rpm. You mostly can feel it through the stick shift and it is definately rpm related.

Being a first time Subaru owner I would like to know if this is just part of the package or if I need to track down a dealor and have them look at it. My nearest dealor is 100 miles away. The rough idle is fairly common in boxer engines and especially when turbocharged.

I very much appreciate anyone's thoughts and comments!

Thanks!
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Old 01-02-2002, 07:29 PM   #2
mlambert
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Member#: 13831
Join Date: Jan 2002
Location: 99 problems but a bitch aint 1
Default

Mine does the exact same thing, I have 2900 miles on it and it started after around 1000. Havnt changed the oil yet, looking for some tips on that.

I wouldnt worry much, I honestly think its normal.
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Old 01-02-2002, 08:16 PM   #3
stikboy
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Member#: 6697
Join Date: May 2001
Chapter/Region: MWSOC
Location: Cowpie, WI
Vehicle:
2011 WRX 5-door
Look-At-Me Red

Default Rough idle

Guys, don't worry about it. Your engines are still breaking in and things like this can happen in winter. My RS does it once in a while. If the rough idle still sticks once you have had the car running more than 20 minutes, you may want to call Subaru. Otherwise, I wouldn't be concerned.

stikboy
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Old 01-03-2002, 08:37 PM   #4
mr2guru
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Member#: 10334
Join Date: Sep 2001
Location: St. Louis
Vehicle:
91 RX7 LSx swap
'09 CC 3.6 4motion

Default

I noticed the same when I got my WRX. A little rough at idle. Even my passengers noticed it. I really think it is normal as my rpm doesn't move. Also I have the factory guage pack and the boost/vacuum, well the vacuum is rock solid at idle. Also I checked all the engine parameters with an OBD2 scanner at idle and nothing is fluctuating at idle. So I chock it up to being normal as many other have reported the same.
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Old 01-04-2002, 10:40 AM   #5
chilipepper
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Member#: 13140
Join Date: Dec 2001
Location: Dickinson, ND
Vehicle:
2002 WRX Wagon
Silver

Default

This all sounds very close to what I'm experiencing. Last night as a matter of fact I hooked it up to an ODB2 scanner and it all checked out and had no codes present.

mr2guru, do you notice the roughness in the engine at any higher RPM's like I mentioned in the 2500 RPM range?? The only place I really can feel this roughness is at the stick-shift or through my feet on the pedals.

mr2guru, also does your idle ever smooth out? Mine is pretty much there. It may come and go a little bit but for the most part if the engine is hot or cold you can feel it there at idle.

I appreciate all of the insight! Thanks!
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Old 01-04-2002, 12:52 PM   #6
mr2guru
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91 RX7 LSx swap
'09 CC 3.6 4motion

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Yeah it's always there at idle, hot or cold. But once the revs are past 1000 it's gone. So, no, they don't come back at higher revs.
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Old 01-11-2002, 02:44 PM   #7
Stanley
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Old 01-13-2002, 08:11 PM   #8
jakester
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Member#: 11564
Join Date: Oct 2001
Location: I'm stuck in the trunk.. HELP!
Vehicle:
2002 WRX
WRB

Default

when I first got my wrx it had an extremely rough idle so i took it to the dealer but they were so far away that by the time i got there it was gone. so they checked almost everything then one of the mechanics said i try this and what he did was pull out the water resivor tank and down there on the engine is a white plug he pushed it in and it locked on. then he said it may not have been on all the way and it was causing a miss fire. after that the car didn't have a rough idle at all but then I did the crazy earthing mod which is upgrading the grounds with 4 guage wire did the negative from the battery to the body and each side of the intake manafold. that helped out even more and it also helped the higher rpm smoothness.
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Old 01-16-2002, 02:21 PM   #9
goobie
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Join Date: Jul 2001
Location: White Rock BC, Canada
Vehicle:
2006 WRX Wagon
WRB

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I realize it would be quite premature in your case, but check your plug wires for solid connection. I doubt they are failing this early in the game, but that's the same symptoms I had until the dealer replaced my wires!
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