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Old 06-05-2006, 11:28 AM   #1
linsavy
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1997 GF4-STiV3 clone

Default shaking at idle when in gear?

My 99GT 4eat wagon shakes a lot at idle when in gear. It has been doing it for a long time, but feels worse lately.
It is fine when in park. It is fine when cruising.
No codes.
Plugs and wires are fairly new.

I searched and saw only a few similar posts.

I will check the motor mounts and IAC.

Anyone else have this too?
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Old 06-05-2006, 11:42 AM   #2
fibuz
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ECU reset? May re-adjust what RPM idle is at for summer temps/gas.

fibuz
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Old 06-05-2006, 11:53 AM   #3
linsavy
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Nope, not the ECU. Reset it on Friday, when I ran the battery down in the Impreza and then had to remove bat. to boost it.
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Old 06-05-2006, 11:55 AM   #4
fibuz
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Motor/tranny mounts are a good start then.

I'd also check the transmission fluid.
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Old 06-05-2006, 12:12 PM   #5
Wiscon_Mark
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Quote:
Originally Posted by linsavy
Nope, not the ECU. Reset it on Friday, when I ran the battery down in the Impreza and then had to remove bat. to boost it.
How long was the car without power?

It takes a bit, a minute won't do it.

I let mine sit for a half an hour.
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Old 06-05-2006, 12:55 PM   #6
GTWagon_Phreak
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97 LegacyGT Wagon 4EAT

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My car with 4EAT was doing something similar. It idled roughly overall, but when in D it would shake the car quite a bit and would not when it was in neutral. O2 sensor was the culprit, replaced it and idle is much better now.
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Old 06-05-2006, 12:57 PM   #7
linsavy
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It's not the ECU. It has been doing this for 2 years at least, just got worse lately.
Tranny fluid was changed not too long ago.
It happens only when in gear.
Might be the torque converter too.
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Old 06-05-2006, 01:32 PM   #8
aross
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Better when the A/C is on or off?
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Old 06-05-2006, 09:58 PM   #9
Jonathan
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I have this same issue with my "winter beater" 1996 Legacy "L" (also 4EAT automatic). Idling away (say at a traffic light) with the gear lever in "D" it SOMETIMES shakes (a lot), and other times is much smoother. Placing the lever in "P" or "N" immiediately makes the shaking go away. I bought this car used with 180K+ miles on it and it did this from day one since I purchased it, although I did have the transmission fluid flushed and that SEEMED maybe to have helped, although I am not sure.

I sure would like to know what it is, although other high-milage automatics maybe do this as well ?

I havent tried switching the A/C on/off to see if that has any impact, although I recall it shaking during a few winter snow storms (when I for sure didnt have the A/C on) so I doubt that the A/C has much if anything to do with it. I will give it a try though.
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Old 06-05-2006, 10:02 PM   #10
GTWagon_Phreak
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Quote:
Originally Posted by GTWagon_Phreak
My car with 4EAT was doing something similar. It idled roughly overall, but when in D it would shake the car quite a bit and would not when it was in neutral. O2 sensor was the culprit, replaced it and idle is much better now.
^^
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Old 06-05-2006, 10:07 PM   #11
Jonathan
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Quote:
Originally Posted by GTWagon_Phreak
My car with 4EAT was doing something similar. It idled roughly overall, but when in D it would shake the car quite a bit and would not when it was in neutral. O2 sensor was the culprit, replaced it and idle is much better now.
Hmmm.. the O2 Sensor, huh ? My car seems to run rather smoothly even at idle. I don't think there is any form of an irratic idle, and I would also assume if it needed an O2 sensor that maybe there might be other symptoms... check engine Light (CEL) codes or something ?

Might be worth a shot though those O2 sensors can be rather expensive to replace.
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Old 06-05-2006, 10:14 PM   #12
GTWagon_Phreak
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O2 sensor doesn't have to throw a CEL to be not performing properly.

Your car doesn't idle rough all the time you said, which means it may not be an O2 sensor. Mine was idling rough pretty much 100% of the time from what I remember. Sounded like the OP's problem might be more applicable.

I got my front O2 sensor for like $58 or $68 shipped from car-stuff.com

My O2 sensor saga:
http://forums.nasioc.com/forums/show....php?t=1003558
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Old 06-06-2006, 02:15 PM   #13
linsavy
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Jonathan,
Yours sound the same as my symptoms. The mileage is not really high only a little over 80k miles plus it has been doing this since 45k miles. Just seems a little worse now. It makes the coins in the holder buzz while I am waiting at a stop light.
I doubt the O2 sensor, because it runs very well the rest of the time.
I have been using A/C lately and this coincides with my feeling that the shaking is getting worse.
The shifts when cold are a little harder too.
I might just have to let the dealer check it out...Oh the horrors. I hate going in there when I don't know exactly what I need fixed.
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Old 06-06-2006, 02:33 PM   #14
DerFahrer
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What's 'a lot?'

Subarus naturally have bumpy idles. It's something I've grown used to over the years. But if it's really bad, then you might need something as simple as a tune-up, or maybe motor mounts...
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Old 06-06-2006, 10:29 PM   #15
linsavy
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The motor mounts look OK. I moved the engine around a bit and they did not show excess movement.
'A lot' means the dash buzzes and coins buzz when I am in gear at a stop. It completely goes quiet and smooth when in neutral or park. Kicking on the A/C makes it worse.
The idle drops as low as 600 rpm when in gear with a/c on. This is bad for the shakies. The idle rises to about 900 when I am in park and the motor smooths out.
What RPM are people seeing when in gear with A/C or and Off?
I am starting to think it is the idle controller. It seems too low.
I have experience with several subaru motors, this one is rough, but only some of the time. Hence, I think it is fixable.
I just changed the PCV and cleaned the throttle body, but that was no help.

Others with same issue http://forums.nasioc.com/forums/show...ght=shaky+idle

Last edited by linsavy; 06-06-2006 at 11:29 PM.
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Old 06-06-2006, 11:27 PM   #16
linsavy
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OK then.
I went out and inspected the Idle Air Solenoid. I took the bold move of unplugging it, then plugging it back in. My idle shaky is much reduced. I feel no difference now between the A/C on or off although the idle does kick up a little.
So I think the issue is with the IAS. The connect maybe was poor or there is something amiss inside it. I hope this does the trick because it is a pretty low buck fix.
Thanks for the help all.
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Old 06-06-2006, 11:45 PM   #17
GTWagon_Phreak
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My car idles at about 600RPM with AC off, can't speak to AC on. For me its when the engine is in the 800-900 range, like when its cold, that it vibrates more.
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Old 06-15-2006, 10:57 PM   #18
linsavy
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Update:
I swapped IAC's with a used one from an Impreza DOHC. I cleaned it up beforehand with TB cleaner. Put it in. (That was fun!! NOT).
The idle is now very good while in park with A/C on and off.
Pretty good while in gear and A/C on, idles at 700.
A little shakey while in gear and A/C off, idle drops to 650. This seams to be too low and has a harmonic vibration.
I think this is about as good as it will get.
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Old 06-16-2006, 07:03 PM   #19
Jonathan
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Thanks for the tip.

I will give it a shot.
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