Go Back   Club Lexus Forums > Lexus Model Forums > RX Models > RX - First Generation
Sign in using an external account
Register Forgot Password?

Check engine light: vacuum leak

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 01-02-07, 05:48 PM   #1
genijet
Driver School Candidate
Trader Score: (0)
 
Join Date: Dec 2006
Location: Ky.
Posts: 46
Default Check engine light: vacuum leak

I brought my 1999 RX300 to the dealer because the engine check light went on and was told that it was a vacuum leak. How can I find out where the leak is?
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!
genijet is offline   Reply With Quote
Old 01-02-07, 10:19 PM   #2
Lexmex
Super Moderator
Trader Score: (0)
 
Lexmex's Avatar
 
Join Date: Apr 2004
Location: Miami, Florida
Posts: 16,387
Default

Quote:
Originally Posted by genijet View Post
I brought my 1999 RX300 to the dealer because the engine check light went on and was told that it was a vacuum leak. How can I find out where the leak is?
Do you know what the code number was for the light, as vacuum leak can pop up in a number of places? One common issues is the hose that goes on to the back of the air box being lose or not attached.
__________________
Homepage of my 1999 RX300 AWD
Lexmex is offline   Reply With Quote
Old 01-03-07, 04:20 PM   #3
genijet
Driver School Candidate
Trader Score: (0)
 
Join Date: Dec 2006
Location: Ky.
Posts: 46
Default Lexus Vacuum System Diagram

Please show me where the"air box" is in the attached diagram and how I might locate the leak. Thanks, Carl
Attached Images
 
genijet is offline   Reply With Quote
Old 01-03-07, 06:18 PM   #4
mikey00
Lexus Test Driver
Trader Score: (0)
 
Join Date: Jul 2001
Location: New Jersey
Posts: 959
Default

Quote:
Originally Posted by genijet View Post
Please show me where the"air box" is in the attached diagram and how I might locate the leak. Thanks, Carl
The hose lexmex is referring to is part of the evap system and when disconnected will through off P0440, P441 and P0446 codes. This is a common problem as it is very easy to disconnect the hose when lifting up the top of the air box to check the air filter. The hose is located behind the air box and connected to the top/back of the lid. It is directly under the brake fluid resovoir. The hose connects to a metal tube about 10" down. This is where it usually disconnects.
mikey00 is offline   Reply With Quote
Old 01-04-07, 01:50 PM   #5
genijet
Driver School Candidate
Trader Score: (0)
 
Join Date: Dec 2006
Location: Ky.
Posts: 46
Default

The hose connection to the metal tube was secure. I could not find the canister to check its 2 connections. Advise me here.
Is it possible the light goes on automatically after so many miles?
genijet is offline   Reply With Quote
Old 01-04-07, 02:36 PM   #6
Lexmex
Super Moderator
Trader Score: (0)
 
Lexmex's Avatar
 
Join Date: Apr 2004
Location: Miami, Florida
Posts: 16,387
Default

Quote:
Originally Posted by genijet View Post
The hose connection to the metal tube was secure. I could not find the canister to check its 2 connections. Advise me here.
Is it possible the light goes on automatically after so many miles?
Well, the light can go on for certain reasons. The most common code is the P0171 lean error, which can trigger the light. I have mentioned in the past to stop an autozone and get the code (it is free). The dealer should have given you the code number.

The other thing we do is with the vehicle turned off, pull the EFI fuse out for a few seconds. If it comes back on later, it wasn't something related to climate or air conditions.

However, if you are able to get the code, I would be more than happy to go over it with you in detail to narrow down the causes.
__________________
Homepage of my 1999 RX300 AWD
Lexmex is offline   Reply With Quote
Old 01-04-07, 05:51 PM   #7
mikey00
Lexus Test Driver
Trader Score: (0)
 
Join Date: Jul 2001
Location: New Jersey
Posts: 959
Default

Quote:
Originally Posted by genijet View Post
The hose connection to the metal tube was secure. I could not find the canister to check its 2 connections. Advise me here.
Is it possible the light goes on automatically after so many miles?
I don't think there is much of a chance that the hose is off at the canister. The metal tube is where it always disconnects from lifting the top of the airbox.
The light does not come on automatically after so many miles. It definetly takes a problem to turn the light on but it could be as simple as a loose gas cap. First reset the light by pulling the battery cable or fuse. If it doesn't return, you're good. If it does, it would be best to either get the code read or get a cheap reader (about $40) and read it yourself. Once you have the code come back to this forum and do a search on it for a lot of info. You could also google it for more generic info.
Can you provide any more info about what happend at the dealer? Did he just say "it's a vacuum leak" and walk away?
mikey00 is offline   Reply With Quote
Old 01-05-07, 12:00 PM   #8
genijet
Driver School Candidate
Trader Score: (0)
 
Join Date: Dec 2006
Location: Ky.
Posts: 46
Default genijet

Mikey00 Thank You. I Removed The Battery Cable And It Worked The Light Wet Out. Thanks Again Carl
genijet is offline   Reply With Quote
Old 01-05-07, 12:01 PM   #9
genijet
Driver School Candidate
Trader Score: (0)
 
Join Date: Dec 2006
Location: Ky.
Posts: 46
Default genijet

Mikey00 Thank You. I Removed The Battery Cable And It Worked The Light Went Out. Thanks Again Carl
genijet is offline   Reply With Quote
Old 01-05-07, 12:18 PM   #10
salimshah
Moderator
Trader Score: (0)
 
Join Date: Apr 2001
Location: Austin, TX
Posts: 8,181
Default

Celebrate, when it stays off after 100 miles or so of driving.

Right now you have cleared the warning condition. The new values will be accumalated with a bit of driving.


Salim
salimshah is offline   Reply With Quote
Old 01-05-07, 12:23 PM   #11
Lexmex
Super Moderator
Trader Score: (0)
 
Lexmex's Avatar
 
Join Date: Apr 2004
Location: Miami, Florida
Posts: 16,387
Default

Quote:
Originally Posted by salimshah View Post
Celebrate, when it stays off after 100 miles or so of driving.

Right now you have cleared the warning condition. The new values will be accumalated with a bit of driving.

Salim
That reminds me of something. A few times going up to the Texas border my light came on (this was when my RX was pure stock engine-wise) and then (without stopping) the light would go off. I recall reading somewhere that if is just climatological (as opposed to something really wrong), that after turning the vehicle on 3 times, that light will go out.

However, of course the magic of the EFI fuse/negative battery cable works wonders.
__________________
Homepage of my 1999 RX300 AWD
Lexmex is offline   Reply With Quote
Old 01-05-07, 04:55 PM   #12
mikey00
Lexus Test Driver
Trader Score: (0)
 
Join Date: Jul 2001
Location: New Jersey
Posts: 959
Default

Quote:
Originally Posted by genijet View Post
Mikey00 Thank You. I Removed The Battery Cable And It Worked The Light Went Out. Thanks Again Carl
As Salim already said don't celebrate just yet. If it is a genunine problem the light will be back.
Interesting side note here: My wife called this morning stating that the check engine light came on on her way to work today. My thought was to go to autozone and see if they would read the code for free or buy a cheap code reader. I did a quick search and came up with some on ebay for $16.99 plus shipping. They were brand new with a money back guarantee. They were OBD II, capable of reading multiple codes, could reset the light and had 2 buttons. Some of the earlier cheap ones were lacking some of these features. Once the wife came home I did a quick check of the car and found the plastic ring that snaps around the gas cap to keep it attached to the car when it is removed for fueling had come off. The last time she got gas the attendent (no self serve in NJ) put the ring over the gas tank opening and screwed the cap down using the ring as a gasket of sorts. This must have caused a poor seal and set off the light. I didn't reset the light yet. I am just going to wait to see how long it takes to go out. There is some spec as to the number of cycles it waits.
mikey00 is offline   Reply With Quote
Old 01-05-07, 07:56 PM   #13
woods
Driver School Candidate
Trader Score: (0)
 
Join Date: Jan 2007
Location: GA
Posts: 8
Default

2000 RX300

The check engine light and VSC control light have been coming on and off lately. Advanced Auto checked the codes tonight (P1130 and P1150)
Both are Air Fuel Ratio Sensor Circuit Range/Performance malfunctions Bank 1 Sensor 1 and Bank 2 Sensor 1.

Seeing it is a performance malfunction and not a response malfunction what does this mean? Also which Air Fuel sensor/s does this refer too? Any help would be appreciated.

Woods
woods is offline   Reply With Quote
Old 01-06-07, 08:20 AM   #14
Lexmex
Super Moderator
Trader Score: (0)
 
Lexmex's Avatar
 
Join Date: Apr 2004
Location: Miami, Florida
Posts: 16,387
Default

Quote:
Originally Posted by woods View Post
2000 RX300

The check engine light and VSC control light have been coming on and off lately. Advanced Auto checked the codes tonight (P1130 and P1150)
Both are Air Fuel Ratio Sensor Circuit Range/Performance malfunctions Bank 1 Sensor 1 and Bank 2 Sensor 1.

Seeing it is a performance malfunction and not a response malfunction what does this mean? Also which Air Fuel sensor/s does this refer too? Any help would be appreciated.

Woods
Woods,

Will go over this in your other post in just a bit.

Saludos,

Lexmex
__________________
Homepage of my 1999 RX300 AWD
Lexmex is offline   Reply With Quote
Old 01-06-07, 12:51 PM   #15
genijet
Driver School Candidate
Trader Score: (0)
 
Join Date: Dec 2006
Location: Ky.
Posts: 46
Default

MickeyOO I THOUGHT I FIXTED IT,BUT THE LIGHT CAME ON AGAIN AFTER ABOUT 10 MILES. CARL genijet
genijet is offline   Reply With Quote
Old 01-06-07, 12:51 PM
 
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
I need help plugging back this hose "vacuum leaks" mike510 GS - Second Generation 4 09-17-14 11:38 AM
is350 VSC check light is250fsprt IS - Second Generation 29 03-09-13 02:29 AM
Humming 2000 ES300 edaphos ES300 and ES330 2 01-26-13 08:05 PM
what happens if i disconnected iacv on 92 sc300? JustChill Performance & Maintenance 2 03-07-12 02:19 PM
2000 es300 p171 code asf4life ES300 and ES330 3 08-18-05 09:54 PM


Tags
1999, 2004, check, common, diagram, engine, hose, is300, leak, lexus, light, reason, rx300, sc430, show, vacuum

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -7. The time now is 03:11 PM.

Join ClubLexus
Advertising


Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS


Get all contact info