I bought my car about 2 months ago, and ever since i got it it goes through gas like there's no tomorrow. It had the bottle before I got it. Could it be something in the computer, Fuel pressure changed, or bad O2 sensors.

 

O2s, plugs, wires, fuel pressure regulator, exhaust leaks, bad opti/coil, clogged cat, bad fuel, or a combination of all of them, could cause poor gas mileage.

 

I resently check my 97 it was at 11.16 mpg. I did plugs and wirers and had Chevy reflash the PCM to stock, just in case. The car is stock. Went to 13.00mpg.

 

must be something up with 97s, as my mileage is hovering around 10mpg with a tune up.

 

I would definately try a tune as I think it would help the most but it could be any number of things as Ramair95TA stated. Just start somewhere and see what helps.

good luck,
-JOhn

 

it could be a clogged cat...clogged fuel filter...bad wires...a large host of things...

 

You need some scan data from a test drive. That should give ideas on what is going on.

 

also try the foot mod, dont step on it all the time. =)

but yeah, get a tune up, and in the fashion of cz28.com....


Its probly the Opti.

 

can opti cause bad fuel gas mileage... i mean no mater what i do, i drive hard i drive slow its 12, ac on its 12, t-top open i might get 13 for no reason... its 12 no mater what

i think im gonna hit my O2's as soon as i can afford the SOB's 60$ each :'(... thats what credit cards are for

 

i would check o2's and possibly the cat if it is clogged up

 

Through careful Testing I discovered that My IAT sensor would have erratic readings when the engine was warmed up, yet when the engine was at ambient temp it would test just fine.

I had 12mpg at times and other times close to 13.8mpg. never the same. I finally replaced the IAT and it has been consistenty at 13.5MPG ever since then, I am satisfied with the results. One less gremlin to take care of.


Point being is that in your case it could be a combination of problems. I am sure there is something else in my car that will increase that MPG to at least 16mpg average.



Marvin

 

13.5?? Guys I'm getting around 20MPG on mine with 75% highway driving...if you can't pull 17 or 18 around town theres something wrong. On a long highway trip (the best way to measure it) I can pull 27MPG...

 

I would have to say that something isn't right here. I put my foot into it fairly often, and can't ever remember getting below 15mpg and that was at a road course. I would definitely suggest a full tune up as that is just way too low.

Chris

 

tell me about it, new O2s, new plugs, new wires, new fuel filter, new PCV vavle, new oil in everything, new TPS, new MAP, tried different MAF, I just cant figure it out, now not to hi-jack this guy's threat, but here a link to my auto-tap files if u wanna look at it. also posted in the computer tech forum

ftp://file:file@ftp.isnk.net/home/file

 

Sucks to be you Ryan. I like my 94 Z28, I can mash the throttle all day long and still pull 19 mpg.