disgusting gas mileage

[FUPA]

i am tired of refueling my car like it has a V8 in it. Will just a tune up fix this problem?

[silicuda]

check/replace

1) air filter
2) spark plugs
3) spark plug wires
4) oxygen Sensor

my car only does 350KM per tank of gas and its a v6 3.4L...

I know most v8's get 400KM per tank of gas, my car just sucks on gas usage for some reason..

[95Batmobile]

Yeah I just had to fill up today, I got a little over 13 miles a gallon. There were only 170 miles on the tank. Pitiful isn't it.

[GrdLock]

geez, I thought the ~220 miles I get on a tank in my LS1 was bad.. lol... definitely time for a tuneup in those V6's!

[99CamaroBullet]

I usually range in the 280-300 miles per tank, and I have a heavy foot. Wow less than 200 is crazy. Something definitely not right there. [img]graemlins/omg.gif[/img]

[MustangEater8251]

WHOA!

I manged 400 miles on my last tank, 2/3 higway, 1/3 city I even had 2 drag races in there, I was a little easier on the car(had a passenger most the time, so I drive more civilized).

I even get at least 220, with a week of driving hard, a trip to a track(drag or autocross)


I was getting 12 mpg city, and 17 highway, when my o2s went out.


things you should check...

-plugs
-wires(check the EGR, mine likes to come loose and blow exhasut on my passenger wires and cook them)
-get a multimeter(I think autozone will lend them out for free), and check all three coils.
-O2 sensors, I thin autozone will lend yor the special tool that is needed(I just bought one for $4)

O2s was a big culprit on my gas mileage problems, if they read wrong they can be running oyur car rich as hell(I think its a safety feature, as opposed to running lean) Mine did set of an SES light though.

-IAT sensor(with the IAT mod, I lost 5 mpg, so a bad IAT sensor shoudl do the same)

I would also change/clean...
fuel filter
injectors
use upper intake cleaner
TAKE your throttle body off and clean it
check Manifold absolute pressure sensor

[BillyCobin]

I have been getting 14mpg city and 20mpg highway. This weekend I drove from my university to my home (140 miles) with a 180* thermostat, and got 20 mpg all highway with cruise on at about 73 the whole way. This is minnesota mind you. As an experiment, when I got home I put in a 195* thermostat. I didn't change anything else on the car. I filled the tank back up with the same grade of gas and everything. Then drove back to school a day later, weather conditions where the same. I got 26.8 mpg with the 195* thermo. Just something to check if you are in a cold weather area with a low temp thermo.

[silicuda]

I get 220 miles per tank of gas in my 3.4L
I changed my sparks, and air filter and its still the same...

220 miles is driving gently shifting before 3000RPM...

how do i check to see if its my OS sensor??? it could be that im not sure, but i am pissed off that V8's get more than me

[CamaroBill]

Unfortunately, I think that poor gas mileage is a trait of the 3.4 liter engine. I've had two cars with various versions. One was a '93 Lumina Z34 that ran really strong but only got 14 mpg average 50/50 highway/city driving. The other was a POS Olds Alero that ran like sh!t (I bought it brand new and kept it until the 30,000 mile warranty was up then traded it in because I knew I could never afford all of the shop trips the car required). The Alero got only 17 mpg average 50/50 highway/city driving.

For camparison sake, my 3.8 Camaro gets 22 mpg combined (with stock gears it was about 1 - 2 mpg better) and the SS stock got 19 - 20. That car still gets about 15 - 16 mpg with gears + aggressive heads/cam!

I am sure that the cold climate, windy roads and hilly terrain are reasons that everyone around Pittsburgh seems to get well less than advertised mileage.

[95Batmobile]

I'm in Southern CA and get that kind of mileage. It was at 10mpg, but I replaced my thermostat because the old one wasn't working and it went back up to about 13, but it would be nice if I could break 200 miles on a tank of gas. On the highway I should be back to 30mpg since I took that stupid Tornado out.

[MustangEater8251]

I thin its your o2 sensors... because I have a mildly modded 3.4L with 3.42s, and I get more then 200 on a tank, flogging the motor.

[CAMAROWITHBASS]

Is there any way you can physically tell that your 02 sensor needs replacement by taking it out?

[MustangEater8251]

my SES light wnet off....

but if oyu have around 100,000 miles or your car is 8 years old I woudl consider it.

[geisencam]

<blockquote>quote:</font><hr>Originally posted by CAMAROWITHBASS:
Is there any way you can physically tell that your 02 sensor needs replacement by taking it out?<hr></blockquote>

I would like to no also, I get about 200 miles a tanks. [img]graemlins/crybaby.gif[/img] [img]graemlins/crybaby.gif[/img] [img]graemlins/crybaby.gif[/img] [img]graemlins/crybaby.gif[/img]

[CAMAROWITHBASS]

WOW!!! 200 miles!!! i wish i get that kind out of my 3.4, im getting 150-180 off a tank.