Engine Idle Low

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Oct 6, 2013 | 06:13 AM

#16

Lavrishevo

Lexus Fanatic

iTrader: (1)

Joined: Jan 2012

Posts: 5,176

Likes: 325

From: NJ

Does the 430 have a idle air control valve like the ls400?

Oct 6, 2013 | 12:29 PM

#17

Rezonans

Driver School Candidate

Joined: Dec 2010

Posts: 43

Likes: 1

From: CA

No, it has a step motor, in TB, computer controls the butterfly automatically.

Dec 27, 2022 | 04:10 AM

#18

Artistic

3rd Gear

Joined: Oct 2022

Posts: 3

Likes: 0

From: Abu Dhabi

Quote:

Originally Posted by GRAND_LS 4

Just to see if this is the famous low engine idle issue, does the problem fade away when you turn on the headlights and foglights? (or AC)

I have this issue & it's getting on my nerves. Turn on lights & idle fine. Switch off dips down like hell. Any idea how to fix this.

Dec 27, 2022 | 10:48 AM

#19

TominPT

Instructor

Joined: Jan 2018

Posts: 976

Likes: 301

From: WA

Did you clean the 8 idle ports on top of the throttle body, located under the small rectangular cover and held down by some fasteners?
If you Google LS430 Idle ports the first image hit shows what I am talking about...

Last edited by TominPT; Dec 27, 2022 at 10:52 AM.

Dec 27, 2022 | 12:59 PM

#20

teaa

Pit Crew

Joined: Jun 2021

Posts: 138

Likes: 32

From: FL

Quote:

Originally Posted by TominPT

i cleaned that the last time I cleaned my TB and I still have the same idling issue, bout 400rpm~

Dec 28, 2022 | 12:29 AM

#21

Artistic

3rd Gear

Joined: Oct 2022

Posts: 3

Likes: 0

From: Abu Dhabi

Quote:

Originally Posted by TominPT

Not all 8 ports, I saw 2 or 3 ports under the rectangular piece & sprayed some throttle cleaner into that.. But yesterday I observed oil in the back side of the throttle since I tried throttle replacement that didn't help