14mpg :-(

Hondasucks · #1 09-08-2010, 01:20 PM

So my car started getting complete crap for mileage, and the check engine light came on. Pulled an o2 sensor code, so I replaced both oxygen sensors ($98/ea) and I'm still getting 14mpg, and developed an EGR code

I know we have sh*t gas out here (damn ethanol) but any common problem areas I could check as to what would be killing my economy? I'm currently driving my truck cuz it gets roughly the same mileage and diesel is currently cheaper than premium...

Hocrest · #2 09-08-2010, 01:23 PM

How old is your CTS? Mine wasn't giving a code, but was running rough on start-up. Changed the CTS and jumped 5 mpg.

Get the CTS right from Subaru!!!

Huskymaniac · #3 09-08-2010, 01:52 PM

Quote:

Originally Posted by Hocrest

How old is your CTS? Mine wasn't giving a code, but was running rough on start-up. Changed the CTS and jumped 5 mpg.

Get the CTS right from Subaru!!!

What is a CTS and why did you change it if you didn't have a code for it?

scoobymal · #4 09-08-2010, 02:18 PM

Coolant temperature Sender??

LetItSnow · #5 09-08-2010, 02:22 PM

Indeed. Even before it throws a code, it can be in bad enough shape to make starting the engine a challenge.

Manarius · #6 09-08-2010, 02:27 PM

Changed your air filter recently? How about spark plugs? Using the A/C a lot? Any one of these could contribute to your poor gas mileage.

(Point of Reference: I usually get 18-19, but can get down to 16 with a lot of A/C use and no highway miles)

kwren · #7 09-08-2010, 03:15 PM

Quote:

Originally Posted by Hondasucks

So my car started getting complete crap for mileage, and the check engine light came on. Pulled an o2 sensor code, so I replaced both oxygen sensors ($98/ea) and I'm still getting 14mpg, and developed an EGR code

I know we have sh*t gas out here (damn ethanol) but any common problem areas I could check as to what would be killing my economy? I'm currently driving my truck cuz it gets roughly the same mileage and diesel is currently cheaper than premium...

I have stated many times that the 02 sensor code is a catch all code. Trevor isn't here now to declare war on me so I feel relatively safe repeating it.

I feel for everyone on the "damn ethanol". When the "gestapo" started making the oil companies include 10%, our gas mileage dropped at least 10%

Translation... it was at the very least of no value to us.

Keith

Cam · #8 09-08-2010, 05:32 PM

How is the 02 sensor code a "catch-all"?

kwren · #9 09-08-2010, 05:51 PM

Quote:

Originally Posted by Cam

How is the 02 sensor code a "catch-all"?

The code comes up frequently when nothing is actually wrong with the 02 sensors. This is pretty easy to prove when one or both 02 sensors are replaced after getting a code and the problem continues to exist and the same 02 cod is generated.

The computer wrongly gives an 02 code because it senses a problem in the system that would be the result of a bad sensor but is not an actual 02 problem... a seeping head gasket for one can cause this to occur.

There are other things also and that is why I call it the "catch all" thingie. (probably not the technical name)

Keith

dcarrb · #10 09-09-2010, 07:23 AM

Ethanol in gas is a multi-purpose villain. I've run nothing in my cars but the cheapest no-name E10 swill and both get high teens around town and high twenties on the highway. The silver recently cracked 30 mpg for the first time. With AC.

dcb

Huskymaniac · #11 09-09-2010, 07:59 AM

I got a new read on my MPG today and it was 22. That's about 50/50 city/hwy and some use of A/C. I have never gotten a read on pure highway.