Possible tune problem?
Thread Starter
5th Gear Member
Joined: May 2006
Posts: 3,881
From: Florida
Possible tune problem?
Lately Ive been getting horrible gas mileage. Now Im not one to complain about mileage, because I bought a sports car not an econobox, but its just getting ridiculous lately.... I used to get 20-22 mpg, with mixed driving, and that included me getting on it and having fun at times as well. But for the last 5 or 6 fill ups Ive been getting around 12-14 mpg, and thats driving like a granny.... could my tune be so rich that Im losing massive amounts of fuel through the exhaust and getting horrible mileage or should I be looking for other problems like a possible fuel leak or something? Im getting all my mpg info from the computer, and while I know its not perfectly accurate, I find it hard to believe that it could just be 10 mpg off. I also reset it every time I fill up. Any info is appreciated, and asap too. Thanks.
3rd Gear Member
Joined: Feb 2007
Posts: 886
From:
RE: Possible tune problem?
Why don't you try getting rid of the "tune" for a couple weeks and see if it returns to normal. I guess just disconnecting the battery does it but I'm not sure. My mpg on the Message Center is accurate.
If it is that rich your bound to mess up the O2 sensors etc.
If it is that rich your bound to mess up the O2 sensors etc.
5th Gear Member
Joined: Oct 2006
Posts: 3,235
From: MO
RE: Possible tune problem?
Dirty air filter?
ORIGINAL: bl1nkage
Lately Ive been getting horrible gas mileage. Now Im not one to complain about mileage, because I bought a sports car not an econobox, but its just getting ridiculous lately.... I used to get 20-22 mpg, with mixed driving, and that included me getting on it and having fun at times as well. But for the last 5 or 6 fill ups Ive been getting around 12-14 mpg, and thats driving like a granny.... could my tune be so rich that Im losing massive amounts of fuel through the exhaust and getting horrible mileage or should I be looking for other problems like a possible fuel leak or something? Im getting all my mpg info from the computer, and while I know its not perfectly accurate, I find it hard to believe that it could just be 10 mpg off. I also reset it every time I fill up. Any info is appreciated, and asap too. Thanks.
Lately Ive been getting horrible gas mileage. Now Im not one to complain about mileage, because I bought a sports car not an econobox, but its just getting ridiculous lately.... I used to get 20-22 mpg, with mixed driving, and that included me getting on it and having fun at times as well. But for the last 5 or 6 fill ups Ive been getting around 12-14 mpg, and thats driving like a granny.... could my tune be so rich that Im losing massive amounts of fuel through the exhaust and getting horrible mileage or should I be looking for other problems like a possible fuel leak or something? Im getting all my mpg info from the computer, and while I know its not perfectly accurate, I find it hard to believe that it could just be 10 mpg off. I also reset it every time I fill up. Any info is appreciated, and asap too. Thanks.
4th Gear Member
Joined: Feb 2007
Posts: 1,028
From: Green Mt State
RE: Possible tune problem?
Fill up your tank.
Hit the highway.
Watch the highway mile markers.
When youpass 100 get off the highway and tank up.
You will either use 5 gallons or 10.
Computer is probably off kilter.
SOHC
Hit the highway.
Watch the highway mile markers.
When youpass 100 get off the highway and tank up.
You will either use 5 gallons or 10.
Computer is probably off kilter.
SOHC
5th Gear Member
Joined: Mar 2006
Posts: 2,179
From: Nor Cal
RE: Possible tune problem?
ORIGINAL: danomano
Could also be ethanol. I heard they started putting more in the gas now. And never use E85.
Ethanol = bad gas mileage
Could also be ethanol. I heard they started putting more in the gas now. And never use E85.
Ethanol = bad gas mileage
How many miles are on your car? Your Oxygen sensor may need replacing and I would also try cleaning the MAF and the Air filter. If you have over 30k then have the upstream o2's replaced these are like tune up items. However my guess is you have a contaminated MAF. Go to the store and buy a can of the CRC MAF cleaner then remove the MAF from the air filter housing and simply spray the wire inside. Let it dry and then reinstall.
Richard
Thread Starter
5th Gear Member
Joined: May 2006
Posts: 3,881
From: Florida
RE: Possible tune problem?
Thanks guys, Ill try some of this stuff.
Unfortunately I cant return my car to stock for long because my tire size is different then stock and my speedo will be way off, and the miles on the car will be incorrect.
It could be a dirty air filter, but I have a C&L intake, so can I clean that one or do I have to just buy a new one?
My car has about 15k on it.
And no, its not ethanol, I live in Fl and use premium.
Unfortunately I cant return my car to stock for long because my tire size is different then stock and my speedo will be way off, and the miles on the car will be incorrect.
It could be a dirty air filter, but I have a C&L intake, so can I clean that one or do I have to just buy a new one?
My car has about 15k on it.
And no, its not ethanol, I live in Fl and use premium.
s197 Junkie
Joined: Sep 2006
Posts: 16,088
From: IN
RE: Possible tune problem?
ORIGINAL: bl1nkage
Unfortunately I cant return my car to stock for long because my tire size is different then stock and my speedo will be way off, and the miles on the car will be incorrect.
Unfortunately I cant return my car to stock for long because my tire size is different then stock and my speedo will be way off, and the miles on the car will be incorrect.
Thread Starter
5th Gear Member
Joined: May 2006
Posts: 3,881
From: Florida
RE: Possible tune problem?
Mine is off about... 7 mph without my tune @65.
Anyone have an answer on my air filter question?
I filled up the day I posted this, just had to fill up again tonight... computer said 170 miles...
Anyone have an answer on my air filter question?
I filled up the day I posted this, just had to fill up again tonight... computer said 170 miles...