dodgy mpg???

11th March 2010, 19:52

hi people!

as the title says im geting dodgy mpg from my vtr, ive got jst above half a tank and ive done 100 miles since fillling it up, and thats driving economical too!! changed oil, air and fuel filter and did a oil change at the weekend and thats not helped at all, can anyone shine some light on this please?? lol!

cheers

11th March 2010, 20:02

What kind of driving has it been?
If you've just been doing short drives around town then it's nothing to worry about.
If you've been doing motorway driving then somethings probably wrong though

Have you worked out what kind of mpg you're getting?
I get around 35-38 around town driving slower than my nan

edit: i also find that driving with a car full of people makes your fuel economy drop really badly!

11th March 2010, 20:08

Quote:

Originally Posted by gsavill90

What kind of driving has it been?
If you've just been doing short drives around town then it's nothing to worry about.
If you've been doing motorway driving then somethings probably wrong though

Have you worked out what kind of mpg you're getting?
I get around 35-38 around town driving slower than my nan

i reckon im doing around 6miles motoway and 8/9 miles town driving to work everyday, and like you say driving like someones nan ( my nan dont drive you see lol! ) and ive worked it out to be doing around 20ish mpg mate??

oh and i dont have anybody in my car only me

11th March 2010, 20:12

Is it overfueling at all?
I don't have a clue if this'll make any difference.. but if you disconnect the battery overnight it resets the ecu. This might help.
Or there might be a sensor out somewhere.
I think MAP sensors can cause overfueling.
That's IF it's overfueling though.. it could always be something else.

11th March 2010, 20:13

worth checking your tyre presures are ok, but not sure if that would make it that bad

11th March 2010, 20:15

Lambda sensor maybe mate ? When thier really dirty or not working they can cause the car to run rich = more fuel used

But im the same the now 25 Mpg

Annoying aint it lol

11th March 2010, 20:18

Quote:

Originally Posted by gsavill90

Is it overfueling at all?
I don't have a clue if this'll make any difference.. but if you disconnect the battery overnight it resets the ecu. This might help.
Or there might be a sensor out somewhere.
I think MAP sensors can cause overfueling.
That's IF it's overfueling though.. it could always be something else.

i might try that tonite mate, see if helps at all, my engine diagnostic light came on around xmas ( my mani was blowing and i got caught in the snow and ice so i think my car was sucking in its own fumes ) so the ecu might be being daft now lol

11th March 2010, 20:20

Quote:

Originally Posted by scotty111

Lambda sensor maybe mate ? When thier really dirty or not working they can cause the car to run rich = more fuel used

But im the same the now 25 Mpg

Annoying aint it lol

yes mate very, its not good when you hace to fill up weekly to get to wrk lol! so ahve you not cleaned youre lambda sensor then?

11th March 2010, 20:27

Is the engine light still on?
Resetting the ecu by leaving the battery disconnected for the night should clear any error codes.
If the light is still on after that then you know something is wrong.
Then get the error codes read at a garage and you'll know where to start

11th March 2010, 20:32

Quote:

Originally Posted by gsavill90

Is the engine light still on?
Resetting the ecu by leaving the battery disconnected for the night should clear any error codes.
If the light is still on after that then you know something is wrong.
Then get the error codes read at a garage and you'll know where to start

no the lights gone off now, my air filter was i right mess so i thought changing that would of helped a little. i am going to try disconnecting the bvattery though mate, i just know im going to get in my car in the morning and think my cars broke though hahaha!!!