buick 6 fuel economy, PLEASE HELP!!!

[AdamOne]

gday fellow members, i need some advice on how to raise the fuel economy in my vp v6. it was running 15.2L/100km BEFORE i installed a new o2 sensor (heavy or light foot, wouldnt budge)........ but since ive installed its its actually risen to 15.3ish (light foot) to 15.8ish(not so light). wtf???? ive done about 400-500kms since installing and last tank i got 360kms approx. this is killing me! i know of some things that i could do such as new fuel filter and a tune what should be NEXT on my list? any suggestions or advice would be appreciated. cheers

[azkwazere]

lower fuel economy? lol... you mean raise fuel economy?

The 02 was a good start, next would be:

Tune- Get a new one Your ECU may be flooding the crap out of your engine. Try a different tune/ecu for a bit and see what that does.

There may be an issue with your injectors/fuel rail but i don think so.. its usually tune/sensor related.

What is your tire pressure?
Is your car extremly areo undynamic?
Carry heavy loads?
What gear do you drive in?

aZk.

[AdamOne]

lower fuel economy? lol... you mean raise fuel economy?

The 02 was a good start, next would be:

Tune- Get a new one Your ECU may be flooding the crap out of your engine. Try a different tune/ecu for a bit and see what that does.

There may be an issue with your injectors/fuel rail but i don think so.. its usually tune/sensor related.

What is your tire pressure?
Is your car extremly areo undynamic?
Carry heavy loads?
What gear do you drive in?

aZk.

lol lower raise you know what i mean.
how much would i be looking at for a good tune?... i'd prob get it chipped eventually so it would be a lot easier to do this all at once yeah?
-tire pressure good, checked it a week or two ago
-heavy loads nope, normally just me n one other person thats it
-and its auto

cheers

[azkwazere]

When was the last time you reset your ECU?

Start there... Tune is fairly cheap, hit up greenfoam on ebay for one.

aZk.

[AdamOne]

wouldnt have a clue last time the ecu was reset?? probably never..
how do you reset it?

[TVR-190]

rev to 3000 for 8 seconds to reset ECU if io remember right

[azkwazere]

rev to 3000 for 8 seconds to reset ECU if io remember right

Nah, dissconnect the main engine fuse for 30secs then when you start the car, rev it to 2000-2500 for 10-20secs (constant) for a re-learn.. its like a calibration.

aZk.

[AdamOne]

Nah, dissconnect the main engine fuse for 30secs then when you start the car, rev it to 2000-2500 for 10-20secs (constant) for a re-learn.. its like a calibration.

aZk.

ok i did that, is there something to tell you if its done it or not?