Curing bad fuel economy.

Reply Subscribe

Thread Tools

Search this Thread

Apr 1, 2007 | 08:41 PM

#16

ricehammer

Registered User

Joined: Nov 2006

Posts: 334

From: Roanoke VA

Bad engine temp sensor keeping the ecu running in open loop?? Just a guess.

Apr 1, 2007 | 09:51 PM

#17

LiENUS

Registered User

Joined: Jul 2005

Posts: 747

From: Baton Rouge, LA

Quote:

Originally Posted by Ironxcross

What I did was I get the mail order tune for the 160 stat before I put it on, then I put everything on at once (pcm, t-stat). I haven't really noticed a difference in the mileage, but then again most of my stuff is city, so its going to suck either way.

Then you probably picked up a little bit on the mpg since you did everything at once. really though the difference between a 160 tstat and a 180 is likely a very small difference in mileage. You'd prolly notice a bigger difference switching the metal in your valve spring retainers.

Apr 2, 2007 | 03:22 AM

#18

sbs

Registered User

Joined: Feb 2004

Posts: 1,154

From: VA

Quote:

Originally Posted by Loading

Well, I've had the car for 4 years now, and since the first day of owning it, I've suffered from poor fuel economy. I think it's time to cure this.

First off, it's not a lead foot. It's poor regardless of how I drive the car. It's always right around 12-13 MPG. If I'm on the highway, 12-13. If I'm romping on it 12-13. If I baby it around town, 12-13. It's a 6 speed, with stock gearing.

I dropped it off at the shop today, and they'll put it on the scanner and hopefully something obvious pops out at them, but he wasn't to optimistic.

It's got brand new wires, newish fuel filter, newish air filter, newish plugs (4 tip platinum--perhaps that has something to do with it.) Brand new AC Delco O2 sensors when the Headers were installed.

The mods on the car are Mid Length Headers, and a Borla Catback.

If the shop does not find anything, what all could I have them look at, or try myself?

Thanks.

Well, if you exhaust all the easier options, check out the opti. When I first got my vette it got poor gas mileage, and a tuneup didn't help. 15 months later the opti bearing went out, and after replacing the opti the mileage went up a few mpg. The other symptoms were an occasional mild hiccup around 4 or 5k rpm, and popping on overrun. Never threw a code.