Sudden increase in fuel consumption.

[Kozen]

Thanks, bro...cos not really familiar with the car, trying to know as much as i can now.

[Kozen]

Btw, do you know what's a Spark Plug, and what does it use for?

[Genie47]

It is to ignite the fuel-air mix. No spark plug, not combustion, no power!

[Kozen]

I see. So a lousy Spark Plug will make it harder to start the engine, am i right?

[Genie47]

No. It is usually a spark plug of the wrong gapping. As spark plugs are used, bit by bit, their material gets blasted away by the electrical sparking increasing the spark plug's gapping. Too big a gap, need a lot of electrical juice to fire = poor performance.

 

Regular spark plugs at most last 30k km. Rare earth element spark plugs last 160k km.

[Rezzzz]

petrol ex also lan lan we still have to buy hehehe.......

[Crv2004]

 

 

Bo pain

[Baphomet]

bros need advice

 

my mazda 3 fuel consumption suddenly increase.

 

There's no change in driving style. No change in driving route. Never did anything to the car recently.

 

Normally every 1 indent(fuel marking on the meter) for the 1st 1/4, i can go ard 30km..

 

This morning it drop 2 indent for only 30km....

 

Normally when I reach 3/4 tank, my mileage will be ard 150-170km. now im just 1 indent above 3/4 and its only 100km.

 

Is it fuel tank leaking? O2 sensor ?

 

My car is stock, using stock paper air filter(changed 3000km ago.)

 

Thanks!

[Silver_blade]

Could be due to tyre pressure or dirty fuel filter.

[Baphomet]

i just change tyres 1 week ago..

 

and this sudden increase only happened from yesterday after i pump fuel..

Edited January 26, 2011 by Baphomet

[Wolfy3769]

try top up again and monitor.. could be ur previous tank was not top up "probably"..some attendant will stop @ first click, while other, just pump until to the max..sometime the diff could be 2~3 litre..

 

also check for leak (as u suggest) and also the tire pressure (if tire pressure too low, the accelaration will not be as fast)..

fuel filter.. i dont think so, cause if u only pump @ spore, the fuel was really clean.. so not likely to be clogged fule filter.

 

ur tire just change.. .there is a possibility that it come with a faulty valves (even if the tire shop change new one for u), thus pressure drop slowly...

re-check the pressure again..

Edited January 26, 2011 by Wolfy3769

[Baphomet]

hmn..this increase is very sudden..thats why suspect something leaking..if its tyre pressure won't be so sudden right?

 

Cause my driving has been very constant. actually after pump yesterday consumption is normal.. is when this morning i drive from home to work..can see the fuel meter drop very fast.. suspect something happened overnight. fuel moved 2 intent from home to work (30km). I don't feel any abnormalties when driving.. just the fuel drop very fast..thats why i suspect fuel tank leaking..

 

anyone knows how to cheak for leaks on fuel tank?

[Wolfy3769]

hmn..this increase is very sudden..thats why suspect something leaking..if its tyre pressure won't be so sudden right?

 

Cause my driving has been very constant. actually after pump yesterday consumption is normal.. is when this morning i drive from home to work..can see the fuel meter drop very fast.. suspect something happened overnight. fuel moved 2 intent from home to work (30km). I don't feel any abnormalties when driving.. just the fuel drop very fast..thats why i suspect fuel tank leaking..

 

anyone knows how to cheak for leaks on fuel tank?

 

 

to check for leak is to use ur nose to smell, in the cabin and around ur car.

... look @ the area where u park, any oil patch.. fuel tank should be under ur passenger backseat... look @ area there.

but if it is a small leak.. then may be more difficult to detect..unless u park long enough for the fuel to show.

[Pocus]

fuel tanks won't leak so easily unless car your was involved in a shootout.

 

Also, suddenly drop in 1 tank also cannot determine your car got problem, sometimes the next tank okay liao.

 

When is your last servicing? Did you do engine flush in that servicing?

 

Did you pump any tank after your tire change? Is the Tire brand the same as the original? Did you upsize your rims? These are contributing factors to FC. maybe your new tires, very good grip, but will suffer in FC....some cheap tires are also know to be heavier

Edited January 26, 2011 by Pocus

[Peqasus]

Was yr ecu resetted? When you first got your car was ur current new fc like tat as well?

[SimonTan]

Using the on board display for fuel efficiently check can be misleading.

Usually after a full tank I will reset the onboard computer for fuel economy display.

Last December, I was on long leave, did no travel on the AYE/ECP to my work place. I got the shock of my life, as my Jazz suddenly shows 9.8km/L as the average consumption.

Then in January when I start going back to work, my Jazz is showing 12.5km/L as the average cinsumption.

 

Seems like when I travel on long smooth AYE/ECP, the car computer will give a better consumption figures.

 

In dec, when I only travels on small roads, going shoppings/markets/sending my kids to classes, those short trips will cause the car to display poor fuel consumption.

 

 

[MLS]

bros need advice

 

my mazda 3 fuel consumption suddenly increase.

 

There's no change in driving style. No change in driving route. Never did anything to the car recently.

 

Normally every 1 indent(fuel marking on the meter) for the 1st 1/4, i can go ard 30km..

 

This morning it drop 2 indent for only 30km....

 

Normally when I reach 3/4 tank, my mileage will be ard 150-170km. now im just 1 indent above 3/4 and its only 100km.

 

Is it fuel tank leaking? O2 sensor ?

 

My car is stock, using stock paper air filter(changed 3000km ago.)

 

Thanks!

 

Monitor in the next topup. It ever happened to me too. Mine dropped quite a lot in my full tank sometime back. After the next topup, it was ok. Probably it's the driving conditions, jam, more idling time, etc that have caused the drop compared to previously.

 

 

[Cyberet]

since you observed it only after top up, it could be the batch of petrol. or could be for this batch of petrol, you've been driving through wet weather.