Why my V6 3.1 wastes so much gas????? Please HELP!! - Third Generation F-Body Message Boards

lexz28o · 10-26-2009, 04:20 PM

Why my V6 3.1 wastes so so much gas.????

Things i changed, to try to help reduce the gas consumption, and still nothing.

1. All fuel injectors
2. All spark plugs
3. All spark plug wires
4. Ignition module
5. Distributor cap
6. Air filter
7. Fuel filter

And my gas tank does not leak.

i drive normal a total of 50miles in the city and burn a full tank of gas.
That is real crazy it eats more then a v12.

Some one can you please help me.

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cIaRmOaCrZo · 10-26-2009, 04:27 PM

wow. well with that kind of comsumption, does it have any drivability problems?

CharcoalBird · 10-26-2009, 04:33 PM

I don't see checking your timing in there....very important.

jensen73110 · 10-26-2009, 05:27 PM

O2 sensor. $20 and it's probably time to change it, even if it's not your main problem.

lexz28o · 10-26-2009, 05:40 PM

Quote:

Originally Posted by jensen73110

O2 sensor. $20 and it's probably time to change it, even if it's not your main problem.

See the thing is, i also changed the o2 sensor like a month ago and the check engine light still stays on i tried disconnecting the battery for 15min so it can reset it self but nothing happened it still comes on and stays on.

lexz28o · 10-26-2009, 05:44 PM

Quote:

Originally Posted by cIaRmOaCrZo

wow. well with that kind of comsumption, does it have any drivability problems?

see that's just it, it rides fine just when idling it seams to go up and down the rpm but very light.

the car seams fine but its far from it with this type of gas consumption.

lexz28o · 10-26-2009, 05:46 PM

See now this is one thing that i did not do.

i am going to talk tomorrow with someone that has a timeing gun

mtwlkn122 · 10-26-2009, 06:45 PM

OMG and i thought my 250 miles per tank was bad!

Um well your on the right track of fixing the problem. Honestly though. Everything that has mentioned will help....i think you have a leak somewhere.

THERE is NO way that your car would burn THAT much gas for that many miles. You must have a leak. Double and triple check that you dont have a leak. Do you smell gas at ALL when its sitting or driving or anything. If you smell it while your driving you, for sure, have a leak somewhere. It might not be in the tank but could be in any of the lines even the return line. It could be at the back of the manifold. It could be anywhere.

Also while I thought of it. What injectors did you use to replace the old ones. What brand and what flow rate?

Gumby · 10-26-2009, 06:49 PM

Sure it not leaking from the lines, like the return line.

lexz28o · 10-26-2009, 08:45 PM

well when its parked i have the car on/running and see no leaks, but i do smell a lil gas some times when i drive in traffic but very faint.

jensen73110 · 10-26-2009, 09:08 PM

Quote:

Originally Posted by lexz28o

the check engine light still stays on i tried disconnecting the battery for 15min so it can reset it self but nothing happened it still comes on and stays on.

See what the code is for the check engine light. That could narrow it down quite a bit.

firebird1992 · 10-26-2009, 09:12 PM

i had this problem to man
both the EGR and O2 went bad
change the egr and O2 then seafoam that bad boy and u should be good

Maverick H1L · 10-26-2009, 10:32 PM

Sounds to me like either a vacuum leak or a MAP sensor problem. More than likely a MAP sensor problem since the light comes back on after the system is reset and not having been run...

Need that code!

:edit: I used to be there... My car was getting that kind of mileage when I first bought it (with the factory 2.8 and all sorts of crap screwed up under the hood). Hated filling it up to go 35 miles to school (using half a tank to get to the cheapest gas station in the area halfway there) and having a quarter tank left when I got home...

Replaced the engine, ECM, most of the sensors and ALL of the fuel injectors and ignition parts, and now I get 400+ per tank when I want to...

zs&tas · 10-27-2009, 03:43 PM

milage that bad has to be a leak, i had a leak but the smell wasnt strong.
it ended up being the charcoal canister.
when you undo the petrol/gas cap is there a hissing sound or woosh of air as the tank equalizes with air pressure ??

james32219 · 11-04-2009, 11:35 AM

Well, when I had my 98 V6 Firebird I had a major power loss and I started getting horrible gas mileage. Turned out to just be a collapsed catalytic converter. Just an idea you may want to check out. Also check to see if you have an exhaust leak somewhere (maybe a cracked exhaust manifold?). But still even if you are having those problems I think you'd still be getting better gas mileage. The only thing I can think of that would make for such horrible gas mileage is things that have already been mentioned such as a vacuum hose leak or a fuel line leak. I know you said you changed your filter but did you check to see if your Fuel pump was working correctly?