What to check when the fuel consumption not consistent ...

[BiMmEr78]

Dear all experts,My car use to clock up 320km for half tank of fuel. But recently with same way of driving and using the same road im not getting close that figure anymore and day by day its getting worst. Would any of you please enlighten me on what are the things to check ? Diag showing no issue but even so i know there is some issue that makes this fella to guzzle more.Thanks dudes.

 

[Mtigo]

Have you done anything before such as changing your wheel size

 

[jason.lim]

320km for half tank is damn good.. my case.. 220km at half tank only is that normal? btw, i am on 19' rims

 

[BiMmEr78]

My rim from 1st day of ownership is always 18". Could it be due to my mileage is hitting almost 200k KM ? All the maintenance in fact i will do ahead of time.

 

[jason.lim]

My rim from 1st day of ownership is always 18". Could it be due to my mileage is hitting almost 200k KM ? All the maintenance in fact i will do ahead of time.

bro, ur E60 which year?
time to change fuel filter? sorry i'm still noob on UDM. maybe other sifu can help.

 

[Volvos525i]

Well in the 1st how do u set the half tank....
Is it on the gauge no of 30 or something...
Do check ur plug air filter fuel filter.....

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[BiMmEr78]

The gauge is showing half which 60 - 70 RM of fuel. Whatever things mentioned by Volvo is just changed 2 months back.

 

[fabianyee]

Best is to reset tripmeter every top up, then at the next top up, record the distance traveled and the value of fuel top up... That's the most accurate way to track.

 

[BiMmEr78]

Bro done that .... found there is significant difference compared to before .... This is what puzzled .... usually something the mech is scractching head i tend to post it here for more valuable input like this.

 

[fabianyee]

Compression test?
Check O2 reading at the exhaust?

Sometimes, the diagnostic can't pick up certain sensor fault accurately. Only an experienced mechanic can troubleshoot.

 

[BiMmEr78]

Done both test at Optimum for few times and best part appeared to be normal .

 

[Volvos525i]

Best is to reset tripmeter every top up, then at the next top up, record the distance traveled and the value of fuel top up... That's the most accurate way to track.

Yes bro this is correct way...
I done this found out the result almost perfect...
Full tank everytime going back home...
Reach my home town top ul full tank again so can do the reading for travel mileage...
My 2cents...

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[riezam]

Ventilation valve? Vanos seal? Or maybe carbon or inject cleaning due to high milage. Im no xpert im juz guesing n im still learning. Hehe. Gud luck bro.

 

[BiMmEr78]

Vanos seal done. Jet cleaning just recently done as well. :wink:

 

[Volvos525i]

Bro how abot ur tyrs pressure on all wheel...just my 2cents...

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[BiMmEr78]

My fren tyre shop is along the way back home ... i practically dropby in his place every week to chat n ask him to check out my tyres as well ... so i think can eliminate this part.

 

[BiMmEr78]

Does the fuel filter will affect the high consumption ? I did not change this part yet

 

[fabianyee]

Does the fuel filter will affect the high consumption ? I did not change this part yet

It does if it's clogged up...

 

[BiMmEr78]

High time to change it then .... by looking at the fuel quality here .... this will be on high part changing list ...

 

[louiswaw]

High time to change it then .... by looking at the fuel quality here .... this will be on high part changing list ...

Mine to share what is your mileage for the full tank?