91 LS400 Power Steering Dead at Idle - Club Lexus Forums

Log In 

91 LS400 Power Steering Dead at Idle

Reply
 
 
 
Thread Tools Search this Thread
Old 07-31-14, 03:00 AM   #1
cmanns
Driver School Candidate
Thread Starter
 
cmanns's Avatar
 
Join Date: Jul 2014
Posts: 6
Default 91 LS400 Power Steering Dead at Idle

I just got this as an replacement for a family members prior LS400 (92-93)

The issue is at idle there is no power steering, rev it to about 1k and poof normal operation (I've drove 92-93 for years....)

Please tell me that doesn't sound like the rack & pinion, etc. It sounds more to me like the pumps pressure isn't maintained (Also no sound on the engine as if no load due to PS btw) so pump is out of efficiency I hope. Potentially due to "screens" I read, or low fluid.

Going to check PS level out tomorrow, car is gorgeous- 160k miles. Only issue was pretty much the power steering, flawless interior. I have yet to read much about this issue, more so the leaks, etc

If you guys think it just needs new pump, awesome. I'll be doing that in a few days, going to try topping off the fluid, having it be flushed, then pump replace.
cmanns is offline   Reply With Quote
Old 08-03-14, 09:52 PM   #2
k7q
Lexus Test Driver
iTrader: (32)
 
Join Date: Jul 2010
Location: ca
Posts: 936
Default

pump is bad or reservoir could be dirty which it isn't allowing the pump to circulate the fluid fast enough. that's why when you give it gas the pump moves fluid faster.
k7q is offline   Reply With Quote
Old 11-29-14, 11:28 PM   #3
espalding
Driver School Candidate
 
Join Date: Jun 2012
Location: NC
Posts: 6
Default

Did you check if the "idle air control valve" that is bolted to the side of the power steering pump has been removed/deleted and replaced with a bolt/plug, also if it has been removed the vacuum lines that were originally connect to it should have been plugged. When the power steering is under a heavy load, like when you turn the steering wheel while parked. The "idle air control valve" is what idles up the engine when P/S pump needs more power.

A new "idle air control valve" is about $120 and are made of plastic that are prone to fail and leak PS fluid (ATF fluid) everywhere and directly onto alternator eventually causing failure.That is one reason why many people delete the "idle air control valve" and make sure their idle rpm is to 700+ to prevent engine stall while cranking the steering wheel at a stop, like when parallel parking.
espalding is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
2000 LS noise Leeroy LS - 1st and 2nd Gen (1990-2000) 23 07-21-16 02:18 PM
The First Gen Power Steering Bible Suneet LS - 1st and 2nd Gen (1990-2000) 236 05-31-16 09:19 PM
1999 LS: Rebuilt Power Steering Pump Problems Beberle LS - 1st and 2nd Gen (1990-2000) 9 04-12-16 07:28 AM
Different Power Steering Failure! New Unsolved Topic! Help! rGavint LS - 1st and 2nd Gen (1990-2000) 5 09-09-15 07:10 PM
Fixed Low Idle Speed Problem jayjw LS - 1st and 2nd Gen (1990-2000) 34 04-16-15 06:27 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -7. The time now is 06:02 PM.


Copyright © 2000-2016 Internet Brands, Inc. All Rights Reserved