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Im Getting Bad Fuel Economy

sky-017

By sky-017,
in General Maintenance

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RANDY Veteran

RANDY

Posted
Posted

I complained a lot in the O2 sensor thread (many pages long!) about poor economy.

I would consistantly get 350k's to a fill. (about 52L)

I changed everything, cleaned everything. The car was totally stock.

So i've put a 3" split dump pipe on, fixed broken studs, changed the cat (still stock from cat-back) and upped the boost to 10psi, and I get 380-400 to a tank EVERY TIME.

So... i'd put that down to an A/F ratio change. I'm using less throttle to get the same power because of the extra air coming in, so less fuel at that map-point in the ECU. You might have (as someone else suggested) a poor AFR. Cleaning the AFM should increase your usage, by my reasoning? If it can "see" more air coming in because it's nice and clean and not insulated with dirt, it will squirt MORE fuel to match. Oh well. Clean it anyway. ;o)

Grinners Contributor

Grinners

Posted
Posted

If your driving in the city/small frequent trips/lots of red lights its possible that your consumption could fall to a tank in 200k.

400k to a tank is with some freeway/normal driving.

Lots of short trips with lots of stop/starting reduce this significantly.

sky-017 Proficient

sky-017

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update - im on empty , with 330kms done . no red light yet , i guess you could say i have done a few small trips , lots of stopping and waiting in traffic...

im still considering changing the o2 sensor .

does anyone know if injector cleaner will help? and which specific one should i purchase.. ?

Modena Grand Master

Modena

Posted
Posted
update - im on empty , with 330kms done . no red light yet , i guess you could say i have done a few small trips , lots of stopping and waiting in traffic...

im still considering changing the o2 sensor .

does anyone know if injector cleaner will help? and which specific one should i purchase.. ?

CHange the air filter. And get that Nulon injector cleaner, its about 10 bucks per bottle. use it for one full tank of fuel, run it empty and see how it goes.

sky-017 Proficient

sky-017

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  • Author
Posted

i only put a pod on about 2000 kms ago , so no need to change that . but i will try the injector cleaner when i fill up again . should i see results if there are any , in the next tank with injector cleaner? or will it be the one after?

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