99 LS induction cleaning/idle messed up - ClubLexus - Lexus Forum Discussion

LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

99 LS induction cleaning/idle messed up

Old 10-20-08, 03:02 PM
Thread Starter
Join Date: Oct 2007
Location: GA
Posts: 155
Thanks: 0
Thanked 0 Times in 0 Posts
Default 99 LS induction cleaning/idle messed up

Hello all,
Just got back from the Lexus dealer, and have a question. I had the de-carb service done on the air intake/throttle body (first time), along with the air filter and a oil change. The car used to idle at 500 rpm, and now it idles at 750, and in park, a hair under 1000 (when warmed up). Called them after driving home and they said it might need a little more time to dry out. True? It seems to run just fine, just not sure why the idle is so high ?? Is it nothing and will go away? They said they hook up a can of cleaner and let that run thru the throttle body while the car is running.

Just wanted to know what you guys thought, maybe I worry too much.

Atl is offline  
Old 10-20-08, 03:51 PM
Liberty VIP
iTrader: (31)
LiCelsior's Avatar
Join Date: May 2007
Location: NY
Posts: 12,352
Thanked 1 Time in 1 Post

maybe they messed with the tps sensor.
LiCelsior is offline  
Old 11-05-08, 02:02 PM
iTrader: (2)
GRAND_LS 4's Avatar
Join Date: May 2004
Location: Northern VA
Posts: 6,248
Thanked 2 Times in 2 Posts

its supposed to idle at 750 though.
GRAND_LS 4 is offline  
Old 11-05-08, 02:12 PM
iTrader: (15)
Join Date: Jul 2005
Location: CA
Posts: 15,995
Thanks: 0
Thanked 25 Times in 22 Posts

500rpm is kinda on the low side to be honest

Most of those who had very dirty induction system will tend to get high idling speed. After a while, everything will return to normal. The ECU will adjust itself to recognize the changes. Only worry about it if you're still having this symptom after a week.
GSteg is offline  
Old 11-07-08, 06:03 PM
Pole Position
Join Date: Mar 2008
Location: New York
Posts: 279
Thanks: 0
Thanked 0 Times in 0 Posts

that higher idle is caused by your baby being able to breath a bit better now =]
Rocan is offline  
Old 11-08-08, 05:15 PM
Lexus Test Driver
tbilisi79's Avatar
Join Date: Nov 2006
Location: NYC
Posts: 920
Thanks: 0
Thanked 1 Time in 1 Post

Same in my car. It was idling at 500 in gear and 700 or so in neutral. Was really low. Few month ago I cleaned out the throttle body with some spray and got rid of the Check Engine and VSC light that would come on from time to time.

RPM went up from what I was used to to 1200 in the morning, but it goes down to 800 or so once warm. It think its normal.
tbilisi79 is offline  

Thread Tools
Search this Thread
Quick Reply: 99 LS induction cleaning/idle messed up

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: