General Tech Ask model specific questions in the appropriate category below. All other general questions within.
Sponsored by:
Sponsored by: DashLynx

Low MPG

Thread Tools
 
Search this Thread
 
Old 02-03-2009, 05:15 PM
  #11  
abingdonmustangs08
1st Gear Member
 
abingdonmustangs08's Avatar
 
Join Date: Sep 2008
Location: Belcamp Md
Posts: 51
Default

It may be your EGR valve....
abingdonmustangs08 is offline  
Old 02-03-2009, 06:11 PM
  #12  
rdsx18
4th Gear Member
 
rdsx18's Avatar
 
Join Date: Jun 2008
Location: MA
Posts: 1,387
Default

Originally Posted by mustangcat
heh what?

Cold air is denser, so it contains more oxygen, which means engines have to work less to get that needed oxygen, getting better gas mileage and more horsepower.
Everybody who lives in cold climates claims they add stuff to the gas in the winter and it makes the mpg drop a little.
rdsx18 is offline  
Old 02-03-2009, 08:46 PM
  #13  
mustangcat
Deputy CatDog - To Purr'tect and Explode
 
mustangcat's Avatar
 
Join Date: Jun 2007
Location: NM
Posts: 1,900
Default

Originally Posted by rdsx18
Everybody who lives in cold climates claims they add stuff to the gas in the winter and it makes the mpg drop a little.
Ehh, I don't know about that. Wouldn't explain why the gas prices always drop during the Winter.
mustangcat is offline  
Old 02-04-2009, 03:20 PM
  #14  
ExtrmZ
4th Gear Member
 
ExtrmZ's Avatar
 
Join Date: Jan 2008
Location: Fargo, ND
Posts: 1,244
Default

Originally Posted by rdsx18
Everybody who lives in cold climates claims they add stuff to the gas in the winter and it makes the mpg drop a little.
its true, they add chemicals to keep the gasoline from gelling up, the gas is not as efficient in the colder climates in the winter.. and the excessive idling doesnt help.. it has to be warm to drive or stuff breaks
ExtrmZ is offline  
Old 02-06-2009, 12:40 AM
  #15  
Jfsram
4th Gear Member
 
Jfsram's Avatar
 
Join Date: Jan 2007
Location:
Posts: 1,999
Default

Check the diagnostic codes. With the engine off, turn the key to on, off, on, off and on. Watch the Check engine light and count the flashes. On, pause, On, On would be a code 12. Last code is 55, end of message.
Jfsram is offline  
Old 02-06-2009, 02:22 AM
  #16  
lcdt94
2nd Gear Member
 
lcdt94's Avatar
 
Join Date: Feb 2008
Location:
Posts: 178
Default

True there is more oxygen during the winter, but I think they lean the fuel mixture up during the winter. You also have a good 5-10 minutes before you engine reaches it's normal operating temperature.
lcdt94 is offline  
Old 02-07-2009, 01:13 PM
  #17  
Juno
2nd Gear Member
Thread Starter
 
Juno's Avatar
 
Join Date: Nov 2008
Location: NJ
Posts: 236
Default

I putted an fuel system cleaner but for now... after 90 Miles, i have the same MPG... 9.8 MPG
Juno is offline  
Old 02-07-2009, 03:33 PM
  #18  
Juno
2nd Gear Member
Thread Starter
 
Juno's Avatar
 
Join Date: Nov 2008
Location: NJ
Posts: 236
Default

Originally Posted by Jfsram
Check the diagnostic codes. With the engine off, turn the key to on, off, on, off and on. Watch the Check engine light and count the flashes. On, pause, On, On would be a code 12. Last code is 55, end of message.

I got the code 12 so on pause on on what does it mean?

Last edited by Juno; 02-07-2009 at 03:45 PM.
Juno is offline  
Old 02-09-2009, 11:13 PM
  #19  
Juno
2nd Gear Member
Thread Starter
 
Juno's Avatar
 
Join Date: Nov 2008
Location: NJ
Posts: 236
Default

Guys?
Juno is offline  
Old 02-12-2009, 02:42 PM
  #20  
junkrider
 
junkrider's Avatar
 
Join Date: Feb 2009
Location: PA
Posts: 26
Default

Code 12 says the codes were cleared. Maybe you took the battery out, or the batt died, or some one cleared the codes before you bought it...????

Dealers, garages charge about 100 or up for a code scan. Go out and get (or borrow) a code scanner that gives codes, definitions, and some sensor readings. I have the CP9185, I love it. Read the raw data and see what the 02 sensors say. A bad 02 sensor wont stop your engine from running, but it will cause the comp to dump fuel in the engine, resulting in low low low fuel mileage.

A good scanner, like the CP9185 i got will run about 185 to 200 us dollars. You fix your car twice and its paid for. The 02 sensor, maybe 50 to 100 dollars. The pain killers after the dealership gets done swapping parts cuz "theyz be old" will drain your bank account. Mechanics and divorce lawyers say the same thing "It'll only cost a little more than you have in the bank".

btw, this only applies to OBDii (1996 or newer vehicles.) For older, you'll need to get a special scanner or a volt meter and crack the books.
junkrider is offline  


Quick Reply: Low MPG



All times are GMT -5. The time now is 05:44 AM.