DC2R - Consuming alot of fuel..

[Vicks]

Hi Guys,

Recently our DC2R has been chewing through petrol like no tomorrow. A full tank would probably only last me ~300km? No sure exactly, but I filled up a tank the other day and it was almost gone after 3-4 days. This is driving at a normal pace, shifting at 3-5 rpm, no vtecing.

So I've come to conclusion that it could be either fuel pump or injectors? Any ideas/suggestions how I can fix this..

[p3akin]

whens the last time you serviced your caR??

[integraR]

replace o2 (oxygen) sensors?
check tyre pressure?

[stndrd]

first question is what fuel are you running it on?
secondly when was the fuel filter last replaced? - if it was over 20,000km ago, change it
thirdly have you fouled a spark plug? - if you have, put a new set of plugs in

If the fuel pump was on the way out you would find that the car will be running leaner, rather than richer. I would recommend a Carbon Clean on car fuel system cleaner. http://www.5starauto.com.au/carbon.htm has a brief outline on how it works. It also cleans carbon deposits from O2 sensors. I have found this to be the best fuel system cleaner (and I have used everything from tank additives to off car injector cleaning/flow test machines)

[chargeR]

Work out your fuel consumption accurately in L/100km and then come back to this thread. You have given no numbers that suggest anything is wrong with your fuel consumption, your fuel gauge could be faulty for all we know.

[1900-hustler]

yeah too many variables

frequent short trips, traffic, tyre pressures, ambient temperatures, bad fuel, wrong fuel, fuel filter, o2 sensor, mods etc etc

list goes on

[Hongtegra]

The use of the A/C also contributes to higher fuel consumption.

Also, if you live in a block of apartments or units, one of your neighbours might be siphoning your fuel.

[trism]

50l tank in an integra. Fuel light comes on with 10l left (supposedly, based on my quick research)

If youre filling up when the fuel light comes on, all the way till the fuel is coming out the top of the filler nozzle, we will say 40l

300km to 40L is about 13.3l per 100km

To me, if all yorue doing is city/suburban/stop-start driving, this seems perfectly reasonable.

if it was up around 17-18l per 100km, id be getting worried.

[Lukey]

the fuel filter on my dc4 hasnt been changed in about 90,000kms and i still get 10l per 100 driving around town (smallish regional town) and get even better economy with free way driving. i always fill up with bp ultimate and always rev 3k+ when driving around (unless in the main street or cold)

[anzai]

rear window dimister, that shit is evil, turn it off!!!

[Vicks]

Car was last serviced <1000km ago - and I don't know if the fuel filter has been replaced since it was bought 50,000km ago, I'm pretty sure the gf hasn't replaced it before.

I've replaced the spark plugs with NGK Platinum which hasnt' solved the issue.

Fuel is Caltex Vortex - driving in suburban and frequent fwy conditions. The throttle body cable of the car has previously has been modified, which I think may contribute to the problem.

I'll fill up a full tank this week and get a more accurate measurement of the fuel consumption

[stndrd]

Personally I would switch to BP ultimate as I have never been able to get consistant results with vortex. Run a couple of tanks thru, get an average L/100km and lets us know

[stndrd]

Also for reference, my EG hatch with B18C (vti-r) with I/H/E, bigger fuel pump & VAFCII tune was averaging 10L/100km (suburban driving that included VTEC & mountain runs) from a 40L tank

[spn.fed]

reset your ecu maybe ?

[Bludger]

placebo effect for sure.

fuel light goes on too early.

[1900-hustler]

yeah man track your fuel usage (L/100kms)

should be anywhere between 8.5-11.5L / 100kms

to measure this just run your car till empty and fill up a full tank & reset odometer

the next time you fill up note your KM and also the amount you filled up

e.g. you fill up 28L and travelled 300kms

You calculate 2800 / 300 = 9.33

so thats 9.33L/100kms


remember you dont need to go all the way to empty but just everytime you fill up reset the odo and make notes of your distance travelled and fuel you put in

makes it easy peasy if you have a spreadsheet that just calculates this - i had one which all i had to do was input the KM and L filled

[_bORdO_]

Some tanks are not a square box, it may be larger toward the top then narrow out toward the bottom hence why the bottom half goes quicker.
It also has something to do with the fuel tank float and needle.... so you may think your losing petrol fast but its just the float needle giving false readings.

Better explained - Enjoy.
http://auto.howstuffworks.com/fuel-gauge1.htm

[_bORdO_]

Hi Guys,

Recently our DC2R has been chewing through petrol like no tomorrow. A full tank would probably only last me ~300km? No sure exactly, but I filled up a tank the other day and it was almost gone after 3-4 days. This is driving at a normal pace, shifting at 3-5 rpm, no vtecing.

So I've come to conclusion that it could be either fuel pump or injectors? Any ideas/suggestions how I can fix this..

just a suggestion but maybe start with the cheaper things like new fuel filter and new air filter.

dont quote me
but maybe without realising you might be pushing the accelerator pedal down further to get your car to move as the fuel and air filter are clogged.
essentially the injectors are getting less petrol which makes it lose more bc your trying to push more through to no effect.

even still i dont think the fuel filter will completely solve your problem.

i support what 1900-hustler says.
this should give you an indication to see if your either paranoid or you actually do have a problem.
:thumbsup:

[Evok]

Ain't sure if i'm correct but from experience but have you been turning on and off your car alot lately :/ it consumes fuel...
Ran around only 310km

check oil? Apparently from Honda specialist Hanny's.. the genuine Honda oil they use is more fuel efficient compared to others! ( have to try this out myself when service comes ! )

[1900-hustler]

Ain't sure if i'm correct but from experience but have you been turning on and off your car alot lately :/ it consumes fuel...
Ran around only 310km

check oil? Apparently from Honda specialist Hanny's.. the genuine Honda oil they use is more fuel efficient compared to others! ( have to try this out myself when service comes ! )

yes true - frequent short trips (less than 8mins or so) then your car will experience higher fuel consumption

and hannys does use OEM Honda FEO - it is very good however because it is a mineral substance it would be recommended to change every 5k kms as it tends to break down before the 10k km interval compared to synthetic oils

[Zilli]

ive had my car for 12 years and the only time i get more than 320-350 is when i am freeway driving... and the car is services as if it was a Ferrari...

a lot of it has got to do with your right foot... mine is rarely used (over the last 5 years anyway), and when it is it get only a few moments of vtec.... dunno, im not too worried about it, but its always been that way for me

[1900-hustler]

is that off a full tank of petrol zilli?

do you have any mods on it?

mine rarely got under 400 off a full tank but mine was completely stock
and that was even driving in peak hour traffic twice a day

[Bludger]

Drove back down to Melbourne last night.

filled up 28ltrs after 380km's

thats 7.4ltr/100km's. 120km/h on my speedo constant. Car is 10km's away from the 80,000km mark.

from memory, i get roughly 450km's per tank combined city/highway.

[OMG.JAI xD]

Is the car running cold?

Look at your temp gauge bud. If the car doesnt warm up it'll run extremely rich.

Common on the B series for the thermostat to fail in the open position.

Happened to my dc2 before, and i was doing 250-300km to a tank.

Also check what youre idling at. You said the throttle cable has been modified.

Theres a lot of variants in terms of faults in the car that may contribute to high consumption.
Leaking exhaust or intake gaskets?
When the oil was change, what was the grade? Too high and it will cause too much drag on the engine components.
Has the tappets been adjusted? (every 40,000kms)
Has the wheels been changed on the vehicle?


If your fuel consumption has been consistent going the same route day in day out, and all of a sudden it starts to drop. Its either, something has been replaced (modified) OR something is on its way out/about to fail.

Worse comes to worse, you have loss of compression in one cylinder causing loss of power in turn causing the driver to apply more throttle each drive.

How long is a piece of string.

[Bludger]

don't know if anyone has mentioned tire pressures yet, makes a difference.

[OMG.JAI xD]

replace o2 (oxygen) sensors?
check tyre pressure?


Yep. Someone did.

[rhys.l]

Drove back down to Melbourne last night.

filled up 28ltrs after 380km's

thats 7.4ltr/100km's. 120km/h on my speedo constant. Car is 10km's away from the 80,000km mark.

from memory, i get roughly 450km's per tank combined city/highway.

This is exactly the sort of mileage I get with mine (just cracked 100 000km) and should probably be the norm for dc2rs without big modifications. If you aren't getting something like this, there is something wrong with your car or you need to adjust your driving style. For instance, I've found since I've stopped constantly heel-toeing on down changes I have improved my economy.

[Bludger]

This is exactly the sort of mileage I get with mine (just cracked 100 000km) and should probably be the norm for dc2rs without big modifications. If you aren't getting something like this, there is something wrong with your car or you need to adjust your driving style. For instance, I've found since I've stopped constantly heel-toeing on down changes I have improved my economy.
You'll save on fuel, but increase wear on your mounts & clutch

[rhys.l]

Maybe slightly, but I think other aspects of how you drive will influence wear on these parts more. I think my generally grandma-style driving will more than make up for the lack of throttle blipping.

I think if you get in a car with an active trip meter you really learn what uses fuel and what doesn't. In a fuel injected car, if you leave the car in gear and use zero throttle (as you can down hills), you will use no fuel. Low gears are good for saving fuel but not if the car is struggling (then they do the opposite)

[Lukey]

my trip meter said 297kms

i filled up 35l

poor.

[1900-hustler]

i used to blip the throttle when downshifting and it didnt even make a difference on the economy of my car at all

[Zilli]

is that off a full tank of petrol zilli?

do you have any mods on it?

mine rarely got under 400 off a full tank but mine was completely stock
and that was even driving in peak hour traffic twice a day

yeh full tank... car is stock bar intake and flywheel and stuff... nothing to the engine.. bear in mind it was stock when i first got it obviously

[joeyybruh]

my trip meter said 297kms

i filled up 35l

poor.

wow , is that normal !?

[Lukey]

wow , is that normal !?

no, i wouldnt usually only fill up 30l