The Subaru SVX World Network   SVX Network Forums
Live Chat!
SVX or Subaru Links
Old Lockers
Photo Post
How-To Documents
Message Archive
SVX Shop Search
IRC users:

Go Back   The Subaru SVX World Network > SVX Main Forums > Technical Q & A

Reply
 
Thread Tools Display Modes
  #1  
Old 10-06-2005, 03:29 PM
dwd1985 dwd1985 is offline
Registered User
 
Join Date: Sep 2005
Location: US
Posts: 433
Hydraulics

So when I start out driving my SVX after it has sat overnight or for an extended period of time, It jerks quite badly, like its shifting extremely hard. It is especially bad when it has been cold, or when I have been parked on a hill. However, after about a minute or two of driving, it goes away, and everything is fine. Im sure that its not the tranny, and I heard from someplace that the AWD system uses some type of hydraulics, and that it is just building up pressure before it is ready to go. But I geuss my question is, is it really hydraulics, or something else? And if it is hydraulics, then am I possibly doing damage to somehting by driving it before its built up the pressure? Its not just a cold weather thing either, it happened in the summer as well. Anyw knowledge you guys have would be appreciated.
Reply With Quote
  #2  
Old 10-06-2005, 04:06 PM
Manarius's Avatar
Manarius Manarius is offline
1995 Subaru SVX LSi Polo Green
 
Join Date: Jul 2005
Location: Grantham, PA (Near Harrisburg)
Posts: 2,119
Send a message via ICQ to Manarius Send a message via AIM to Manarius Send a message via MSN to Manarius Send a message via Yahoo to Manarius Send a message via Skype™ to Manarius
Registered SVX
Well, the AWD system does not use hydraulics..it's all electronic. The clunking is caused by the aging of the tranny. Solution: Well, the most common thing is to either brake band adjust or do a swap all together. However, I did a grounding mod to my Legacy and that took away most of the clunking in shifts.

If you're driving in cold weather, you'd do yourself a favor to drive a little slower until your car is warmed up..it's easier on all the parts that way.
__________________
-Jason
(8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95
Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod,
svxfiles designed transmission mount (), sporting a "new" tail light bar,
silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear
(1977-Present) 1977 Chevrolet Corvette (81k) Silver
(12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k)
I have a bad feeling about this.
-Obi Wan Kenobi
Reply With Quote
  #3  
Old 10-06-2005, 05:03 PM
oab_au oab_au is offline
Registered User
Subaru Gold Contributor
 
Join Date: Mar 2001
Location: Coffs Harb, Australia.
Posts: 5,032
Significant Technical Input Registered SVX
Quote:
Originally Posted by Manarius
Well, the AWD system does not use hydraulics..it's all electronic. The clunking is caused by the aging of the tranny. Solution: Well, the most common thing is to either brake band adjust or do a swap all together. However, I did a grounding mod to my Legacy and that took away most of the clunking in shifts.

If you're driving in cold weather, you'd do yourself a favor to drive a little slower until your car is warmed up..it's easier on all the parts that way.
Shezzz The last time I looked, it used hydraulics. Your not helping anyone by giving em bumsteer info.

Harvey.
__________________
One Arm Bloke.
Tell it like it is!

95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels.
97 Liberty GX Auto sedan. 320,000Kls.
04 Liberty 30R Auto Premium. 92.000kls.
Reply With Quote
  #4  
Old 10-06-2005, 05:22 PM
oab_au oab_au is offline
Registered User
Subaru Gold Contributor
 
Join Date: Mar 2001
Location: Coffs Harb, Australia.
Posts: 5,032
Significant Technical Input Registered SVX
Quote:
Originally Posted by dwd1985
So when I start out driving my SVX after it has sat overnight or for an extended period of time, It jerks quite badly, like its shifting extremely hard. It is especially bad when it has been cold, or when I have been parked on a hill. However, after about a minute or two of driving, it goes away, and everything is fine. Im sure that its not the tranny, and I heard from someplace that the AWD system uses some type of hydraulics, and that it is just building up pressure before it is ready to go. But I geuss my question is, is it really hydraulics, or something else? And if it is hydraulics, then am I possibly doing damage to somehting by driving it before its built up the pressure? Its not just a cold weather thing either, it happened in the summer as well. Anyw knowledge you guys have would be appreciated.
The hard changing when its cold, could be from a dud oil temp sensor. When the oil is cold, the pressure will be higher, so TCU signals the A solenoid to lower the line pressure, to stop that sort of change, and to reduce the engine load. It will only set a code if it is open or shorted, but if its reading is off, you could get hard changing till the oil warms up.

Parking on a hill?,,,,,,,no idea.

Harvey.
__________________
One Arm Bloke.
Tell it like it is!

95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels.
97 Liberty GX Auto sedan. 320,000Kls.
04 Liberty 30R Auto Premium. 92.000kls.
Reply With Quote
  #5  
Old 10-07-2005, 03:45 PM
Earthworm's Avatar
Earthworm Earthworm is offline
Meow!
 
Join Date: Mar 2002
Location: Winnipeg, Manitoba
Posts: 11,957
Send a message via ICQ to Earthworm Send a message via AIM to Earthworm Send a message via MSN to Earthworm Send a message via Yahoo to Earthworm Send a message via Skype™ to Earthworm
I had weird shifts when my Engine Temperature Sensor failed. The tranny would operate with the torque converter locked up even in 2nd gear. Mind you although there's other symptoms for that sensor failing this is always a possibility.
Reply With Quote
  #6  
Old 10-07-2005, 05:34 PM
Manarius's Avatar
Manarius Manarius is offline
1995 Subaru SVX LSi Polo Green
 
Join Date: Jul 2005
Location: Grantham, PA (Near Harrisburg)
Posts: 2,119
Send a message via ICQ to Manarius Send a message via AIM to Manarius Send a message via MSN to Manarius Send a message via Yahoo to Manarius Send a message via Skype™ to Manarius
Registered SVX
Quote:
Originally Posted by oab_au
Shezzz The last time I looked, it used hydraulics. Your not helping anyone by giving em bumsteer info.

Harvey.
Last time I looked, the shift points and the engagement of the clutch packs on the tranny were electronic. I may be mistaken however.
__________________
-Jason
(8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95
Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod,
svxfiles designed transmission mount (), sporting a "new" tail light bar,
silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear
(1977-Present) 1977 Chevrolet Corvette (81k) Silver
(12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k)
I have a bad feeling about this.
-Obi Wan Kenobi
Reply With Quote
  #7  
Old 10-07-2005, 06:34 PM
Earthworm's Avatar
Earthworm Earthworm is offline
Meow!
 
Join Date: Mar 2002
Location: Winnipeg, Manitoba
Posts: 11,957
Send a message via ICQ to Earthworm Send a message via AIM to Earthworm Send a message via MSN to Earthworm Send a message via Yahoo to Earthworm Send a message via Skype™ to Earthworm
That's right, it's electricity that tells the tranny to shift but it's hydraulics that actually do the shift.
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


All times are GMT -6. The time now is 06:38 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
© 2001-2015 SVX World Network
(208)-906-1122