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 11-16-2019, 03:19 PM   #1
400 dollar yaris
 
400 dollar yaris's Avatar
 
Drives: 2007 Yaris sedan
Join Date: Nov 2011
Location: dayton, ohio
Posts: 85
Poor gas mileage...

Hello all,

Recently I've noticed a large decrease in my MPG. I know it is winter time and I expected my MPGs to decrease slightly for things like warm up time and low tire pressue, but I think what I am experiencing is more than this.

I reset my odo trip last time I filled up as a little experiment. Most of my driving is highway. For this tank of gas, I have gotten just under 230 miles. When my car alerted me that I have about 1 gal left in the tank. This is the worst gas mileage I have ever had while owning the car. Before the winter hit, I did a spark plug replacement as well as a coolant change. This was the last maintenance I did before experienceing the lower MPGs, I used NGK laser iridium spark plugs, checked the gaps of all, and made sure they were torqued down correctly. The last ones i took out were denso iridiums that had much larger gaps outside of the spec limits for the yaris with very worn tips, so i was expecting an increase in MPG. Also, I used toyota pink coolant. This weekend, I am doing an air filter clean (K&N) and a seafoam treatment on my next fill up to see if this helps. I have been checking tire pressure frequently and made sure to keep the tires around 32 psi. I still have another 1000 miles or so before the next oil change. I always change the filter and I use pennzoil platinum high mileage. I have checked the car's computer with a code reader and its not giving any codes for anything funky. Any other ideas?

Thank you,
400
400 dollar yaris is offline   Reply With Quote
Old 11-16-2019, 05:50 PM   #2
CB900F2
 
Drives: 08 Sedan
Join Date: Oct 2008
Location: Toronto
Posts: 288
check and clean your MAF sensor....
CB900F2 is offline   Reply With Quote
Old 11-16-2019, 06:17 PM   #3
400 dollar yaris
 
400 dollar yaris's Avatar
 
Drives: 2007 Yaris sedan
Join Date: Nov 2011
Location: dayton, ohio
Posts: 85
I will give that a try as well.

Thank you!
400 dollar yaris is offline   Reply With Quote
Old 11-16-2019, 07:40 PM   #4
400 dollar yaris
 
400 dollar yaris's Avatar
 
Drives: 2007 Yaris sedan
Join Date: Nov 2011
Location: dayton, ohio
Posts: 85
Well pulled the MAF sensor off, sensor was black. Sprayed it with MAF cleaner until it was clean. Also seafoamed a fresh tank of gas and cleaned the air filter. Just filled up and reset the odometer. I'll have an update in about a week.
400 dollar yaris is offline   Reply With Quote
Old 11-16-2019, 08:42 PM   #5
ex-x-fire
 
Drives: 2010 yaris 3 door hatch
Join Date: Jun 2013
Location: Sheboygan Falls, Wi.
Posts: 263
A cooler running engine will use more fuel too, if you can scan it look for temps in the 175-200* range while going down the road.
ex-x-fire is offline   Reply With Quote
Old 11-16-2019, 09:35 PM   #6
zoidberg444
 
zoidberg444's Avatar
 
Drives: Yaris 06 - 5dr hatchback
Join Date: Aug 2015
Location: Birmingham, UK
Posts: 341
Have you checked the live data with the scan tool? What does it say your short and long term fuel trims are?
__________________
- Yaris 2006, 1.0, 5 door hatchback "Betty" - 180,000 miles
UK to Nordkapp in a Yaris
zoidberg444 is offline   Reply With Quote
Old 11-17-2019, 09:54 AM   #7
400 dollar yaris
 
400 dollar yaris's Avatar
 
Drives: 2007 Yaris sedan
Join Date: Nov 2011
Location: dayton, ohio
Posts: 85
Quote:
Originally Posted by ex-x-fire View Post
A cooler running engine will use more fuel too, if you can scan it look for temps in the 175-200* range while going down the road.
Post coolant change I did drive around with my scanner connected to read live data to read temp. I was running right at 186 F, which I checked on some other thread on here seemed to be right around the correct operating temp. I will see if i can check the short and long term fuel data.

Thank you!
400 dollar yaris is offline   Reply With Quote
Old 11-17-2019, 12:26 PM   #8
400 dollar yaris
 
400 dollar yaris's Avatar
 
Drives: 2007 Yaris sedan
Join Date: Nov 2011
Location: dayton, ohio
Posts: 85
found something interesting when looking around.

anyone know where this plugs in? Is it for fog lights even if my car didnt come with them?

Thank you.
Attached Images
File Type: jpg IMG_2540.jpg (145.5 KB, 69 views)
File Type: jpg IMG_2538.jpg (109.1 KB, 67 views)
400 dollar yaris is offline   Reply With Quote
Old 11-17-2019, 12:27 PM   #9
400 dollar yaris
 
400 dollar yaris's Avatar
 
Drives: 2007 Yaris sedan
Join Date: Nov 2011
Location: dayton, ohio
Posts: 85
headlights and turn signal working. This connector was just hanging by the drivers side head light.
400 dollar yaris is offline   Reply With Quote
Old 11-17-2019, 03:48 PM   #10
400 dollar yaris
 
400 dollar yaris's Avatar
 
Drives: 2007 Yaris sedan
Join Date: Nov 2011
Location: dayton, ohio
Posts: 85
It has 11070 on the connector. Trying to look it up on the wiring diagram.
400 dollar yaris is offline   Reply With Quote
Old 11-17-2019, 04:24 PM   #11
400 dollar yaris
 
400 dollar yaris's Avatar
 
Drives: 2007 Yaris sedan
Join Date: Nov 2011
Location: dayton, ohio
Posts: 85
looks like ambient air temp sensor plug, based on diagrams, this looks to have been ripped off of my car when it was in the front end accident prior to buying it. No maintenance light or anything from not having this plugged in?
400 dollar yaris is offline   Reply With Quote
Old 11-17-2019, 06:48 PM   #12
CB900F2
 
Drives: 08 Sedan
Join Date: Oct 2008
Location: Toronto
Posts: 288
I believe that sensor is just used for the AC control...


Quote:
Originally Posted by 400 dollar yaris View Post
looks like ambient air temp sensor plug, based on diagrams, this looks to have been ripped off of my car when it was in the front end accident prior to buying it. No maintenance light or anything from not having this plugged in?
CB900F2 is offline   Reply With Quote
Old 11-18-2019, 08:33 AM   #13
ex-x-fire
 
Drives: 2010 yaris 3 door hatch
Join Date: Jun 2013
Location: Sheboygan Falls, Wi.
Posts: 263
Looks like your running a cold air kit, that doesn't help. Here's what I did to help maintain my mpgs. http://www.yarisworld.com/forums/sho...t=59283&page=2
ex-x-fire is offline   Reply With Quote
Old 11-20-2019, 08:03 PM   #14
400 dollar yaris
 
400 dollar yaris's Avatar
 
Drives: 2007 Yaris sedan
Join Date: Nov 2011
Location: dayton, ohio
Posts: 85
Maybe I should just go back to the stock intake and get a drop in K&N for it... Ive been running the CAI for the past few years with no issues. I'm giving the car one tank of gas this week to see if MPG improves. If not, I will go back to stock intake set up at least for the winter. I'll keep this updated. I'm about half a tank of gas down with around 160 miles on my trip odometer so far for this tank, so there has been some improvement so far with the air filter clean, Seafoam and MAF clean but we will see by the end of the week.
400 dollar yaris is offline   Reply With Quote
Old 12-01-2019, 03:55 PM   #15
400 dollar yaris
 
400 dollar yaris's Avatar
 
Drives: 2007 Yaris sedan
Join Date: Nov 2011
Location: dayton, ohio
Posts: 85
averaging around 30 MPG now after a couple of tanks of gas and all of the cleaning. Not sure if I can do much better than that at the moment.
400 dollar yaris 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
-Mileage Thread- -Log your mileage, year, model, color, any problems here... Kal-El DIY / Maintenance / Service 322 07-20-2016 10:07 AM
Amazing Gas Mileage .. way too easy. edmscan Fuel Economy Forum 9 07-19-2012 06:36 PM
Does Gas Mileage Increase After 1st Oil Change? ChilliwackGuy Fuel Economy Forum 10 08-04-2010 02:13 PM
2009 Yaris Mileage wornways Fuel Economy Forum 3 07-29-2009 11:42 AM
Performance mods that won't affect/will hardly affect gas mileage?? Mr.Yaris Performance Modifications 15 07-30-2007 12:32 AM


All times are GMT -4. The time now is 07:21 PM.




YarisWorld
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.