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View Full Version : Sudden increase in fuel usage.

Phate
07-01-09, 11:08 PM
Recently (as in the past week)

My car has been using A LOT and I really mean a lot of fuel...is it the cold?

See normally I get 18mpg with mixed driving including a fair bit of hoonage *straightens halo*

But in this weather you simply can't drive like that because you'll slip off the road and die...end of.

When I mean a lot I'm talking about half a tank to 70 miles?

Normally I get 150 out of half a tank...

I haven't hit any kerbs recently so I doubt it's tracking.

My car is misfiring occasionally but I know it's way overdue for a service...

any ideas?

Ta :)
dave87
08-01-09, 12:59 AM
after a misfire does the ecu not flag out error codes and change settings on air/fuel mixture. When I went for my MOT it failed on emissions but all they did was hook it up to find misfire error codes and then reset it and it passed.
stamford
08-01-09, 07:22 AM
Yes, get it hooked up as you must have a sensor playing up and it is overfuelling which can cause damage if not sorted asap.

Also look to service your car if not buying the other one ;) plugs etc.
Mat C
08-01-09, 03:50 PM
VIS balance valve. My economy took a sudden dive recently, plugged it in to the diagnostics machine and it came up with the VIS. BV. Repaired it at home (burned out circuit) and the car feels alive again, kick at 3000rpm etc ! And the economy is vastly improved.
RalphG
08-01-09, 05:02 PM
That will be your spark plugs, Jake... :mbounce: Completely black and misfiring on two of them.
vinny1979
08-01-09, 05:03 PM
lol
Phate
08-01-09, 05:47 PM
That will be your spark plugs, Jake... :mbounce: Completely black and misfiring on two of them.

Oh yes!!!!

Car pulls like it used to now, mucchh better :D and the fuel needle didn't move on the way home - awesome.

Thanks again guys, fantastic work as always :mml:
afcbadam
08-01-09, 10:33 PM
150 miles to half a tank is around 30mpg. thats halfing the useable 55 litres.
mattie007
08-01-09, 10:35 PM
My 120 has seen a massive decrease lately. 450 miles is what I usually get, last week I got 270 from the same driving.
Im putting this down to the possible hgf I may have.
Alan.F
09-01-09, 06:48 AM
My 120 has seen a massive decrease lately. 450 miles is what I usually get, last week I got 270 from the same driving.
Im putting this down to the possible hgf I may have.

270 is normal from my 120 only get 400+ when i drive like a vicar
afcbadam
09-01-09, 06:27 PM
270 is normal from my 120 only get 400+ when i drive like a vicar

thats alot worse than my 180. is it running ok?