Toyota Yaris Forums - Ultimate Yaris Enthusiast Site
 

 


 
Go Back   Toyota Yaris Forums - Ultimate Yaris Enthusiast Site > Technical Forums > DIY / Maintenance / Service
  The Tire Rack

Reply
 
Thread Tools Display Modes
Old 11-29-2023, 03:54 PM   #1
mik36
 
Drives: VERSO S
Join Date: Jul 2021
Location: Bromsgrove
Posts: 44
YARIS 1.3 Vaccum from EVAP line

Gents

I had this strange issue in 1.3 petrol engine the evap line I can feel have a high pressure vacuum
When I open the tank cap I feel hissing noise feel pressure released
Is this normal
I was looking at the evap purge valve which has one line from fuel tank evap this line has got vaccum in it and when I removed the finder the rpm increases this line connected to black pipe in the valve there is grey one from this valve which i believe goes into engine


No codes.
When I remove my finger from evap line the rpm increases and LTFT jumped to 9
Any help to test cross check would be highly appreciated
mik36 is offline   Reply With Quote
Old 11-30-2023, 09:39 AM   #2
komichal
 
Drives: Yaris 2007 1.3 2SZFE 64kW
Join Date: May 2012
Location: CZ
Posts: 298
Whenever I remove the tank cap I actually do not hear hissing. I hear clapping as there is negative pressure in the tank that sucks air from outside and I guess there is some protective shutter that that makes the clapping.

Driving Yaris 2007 hatchback with 2SZFE 1.3 engine. Bought it in 2012, always behaves like that, never threw a code, never had any problem with this.
komichal is offline   Reply With Quote
Old 12-01-2023, 01:09 AM   #3
Compeer
 
Drives: NCP90 TRD Yaris Manual
Join Date: Oct 2022
Location: Auckland, NZ
Posts: 266
Quote:
Originally Posted by mik36 View Post
Gents

I had this strange issue in 1.3 petrol engine the evap line I can feel have a high pressure vacuum
When I open the tank cap I feel hissing noise feel pressure released
Is this normal
I was looking at the evap purge valve which has one line from fuel tank evap this line has got vaccum in it and when I removed the finder the rpm increases this line connected to black pipe in the valve there is grey one from this valve which i believe goes into engine


No codes.
When I remove my finger from evap line the rpm increases and LTFT jumped to 9
Any help to test cross check would be highly appreciated
Normal, all my toyotas hissed like theirs vacume in fuel tank when i get gas, current yaris does it too. never ran it without cap on to notice any change,
Compeer is offline   Reply With Quote
Old 12-07-2023, 02:31 AM   #4
zoidberg444
 
zoidberg444's Avatar
 
Drives: Yaris 06 - 5dr hatchback
Join Date: Aug 2015
Location: Birmingham, UK
Posts: 390
Whenever I take the fuel cap off mine it always hisses as air rushes into the tank. I always assumed the EVAP system kept the tank under vacuum in order to draw petrol vapours from the tank into the intake to prevent them off gassing to atmosphere.
__________________
- Yaris 2006, 1.0, 5 door hatchback "Betty" - 240,000 miles
UK to Nordkapp in a Yaris
zoidberg444 is offline   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

Similar Threads
Thread Thread Starter Forum Replies Last Post
NEWS: TOYOTA REVEALS ALL-NEW YARIS SEDAN AT 2006 LOS ANGELES AUTO SHOW VitzBoy General Yaris / Vitz Discussion 7 09-20-2023 07:50 AM
2018 Yaris SE 5MT - T-Sport w/Valvematic! atomic_hoji Performance Modifications 130 02-23-2019 11:56 AM
Do you like the 2012 restyle? hitmoninfinity Third Gen Yaris General Discussion 106 04-14-2016 08:08 PM
Which second hand Yaris to buy? 1.5-1.8 T Sport or 1.3 base? REs Third Gen Yaris General Discussion 5 07-06-2011 04:08 AM
2007 Yaris Pricing Info ! YarisBueller New YARIS Purchase Forum 104 06-24-2009 04:54 PM


All times are GMT -4. The time now is 12:28 AM.




YarisWorld
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.