Chewing Through Petrol More Then Normal

[Sneakyazn]

hey guys just need some hinter's or somethin, ive noticed till just recently in the last few days that the car has eaten almost half a tank and ive only gotten 150k's out of her rather then the usual 200 odd k's any idea's? and yes ive tried to drive as economic as i can but even when ive put my foot down, i still use to get good mileage out of the tank so im just woundering what it could be it is due for a service soon so im just hoping that its just that and only that. that the oil is dirty or something.

[Stealthed]

Leaking Fuel lines?

happned to me, so have a check

[snozzle]

first check for any fuel leaks as above as thats cost free

how does the car idle? if its idling like shit you might have a leaking injector o-ring spitting too much fuel in (pretty unlikely if no one has played around with them)

if that fails, replace oxygen sensor

Edited July 11, 2009 by snozzle

[Harry-Hotpants]

do a diagnostics check on ur ecu

[Marco-R34GTT]

Have you got any aftermarket stuff on your car??

If so, the stock ecu might be having a bit of a hissyfit and could rich & retarding the tune/engine. In which case, you'll be constantly running rich, even when driving midly and hence you'll be using lots of fuel. Alternatively, your O2 sensor might have gone bad and might be malfuctioning. Considering Skylines now are 10+ years old, id could be a factor worth considering. As mentioned above, best taking first for a service with a diagnostics and tune. That way, you've got all bases covered.

[Sneakyazn]

Have you got any aftermarket stuff on your car??

If so, the stock ecu might be having a bit of a hissyfit and could rich & retarding the tune/engine. In which case, you'll be constantly running rich, even when driving midly and hence you'll be using lots of fuel. Alternatively, your O2 sensor might have gone bad and might be malfuctioning. Considering Skylines now are 10+ years old, id could be a factor worth considering. As mentioned above, best taking first for a service with a diagnostics and tune. That way, you've got all bases covered.

cheers guys for the advise, its pretty stock, only mod is cat back, and errr.... it idles just fine, but odly enough the fuel meter sat at half way till it hit 200k's anyways, which is normal for my car dunno about others... so i may just be immagining things ><" but yea ill still go for a full service an diagnostics an tune thingy... ^^ its just hit 106thou k's so its due for one of those major service's so guess ill be needing to do that ^^

Edited July 11, 2009 by Sneakyazn

[R DIRTY 3]

I would suspect o2 sensor failure. (or just worn out)

NGK do a replacement for around 40 or 50 bucks.

Its a cheap fix.

[Marco-R34GTT]

I would suspect o2 sensor failure. (or just worn out)

NGK do a replacement for around 40 or 50 bucks.

Its a cheap fix.

Hey Brad, can that be bought at repco or something, I think I might change mine while I'm at it... I've been a bit sceptical about my own fuel usage in recent months.. $50 isn't alot of money to part with for some certainty...

[reNEGaDe88]

Yeh, get an O2 sensor, they usually go. And will hamper your cruising fuel economy. I have a R32 with RB25 putting out 219rwhp with WOLF 3D tuned. I got 609 km out of a full tank (60L). Which was city driving, highway driving, hard boosting on a car cruise and some stick for fun.

Otherwise fuel leak is probable, but you will probably smell petrol if there is a leak.

[R DIRTY 3]

Hey Brad, can that be bought at repco or something, I think I might change mine while I'm at it... I've been a bit sceptical about my own fuel usage in recent months.. $50 isn't alot of money to part with for some certainty...

Should have. If not, let me know and i can arrange it for you through my work.

[inthisglass]

bard, if you can get the ngk ones with the plugs already on them for $50 then count me in!

best i have seen is $77 from kudos

[R DIRTY 3]

Kral, the NGK ones that i purchased before all come with the plugs. They are a straight changeover in the 33 gtst

[Marco-R34GTT]

Me and Kralos for NGK groupbuy!

Edited July 12, 2009 by Marco-R34GTT

[08yannch]

new O2 sensor and u should maybe look at putting a injector cleaning additive in the fuel have heard of this helping. also change your spark plugs. also clean ABV and AMF.

a major service's should be the ticket "Sneakyazn"

[bubba]

ABV and AMF?

[08yannch]

ABV and AMF?

ABV = air bypass valve

AMF i meant AFM soz = air flow meter

ABV is cleaned with brake cleaner and cotton buds

AFM is cleaned with AFM cleaner $25 it can be found at any automotive shop

[Pal]

anyone know if high flowed injectors will have worse fuel economy than the sards/nismos injectors .have a set of sr20's high flowed to 600cc and chewing through the fuel. got carbon all over the rear bar and my tuner is trying to tell me its the injectors bad spry patttern, not the tune?

[Harry-Hotpants]

pull the injectors out and sonic bath them, we do them at rotomotion, bring them in, we can tell u how good the spray pattern is

[Pal]

location? cost and how much off a drama to pull out

Edited July 13, 2009 by Pal

[bubba]

ABV = air bypass valve

AMF i meant AFM soz = air flow meter

ABV is cleaned with brake cleaner and cotton buds

AFM is cleaned with AFM cleaner $25 it can be found at any automotive shop

Oh by ABV you mean the Auxilary Air Control valve and the Idle Air Control valve..

pull the injectors out and sonic bath them, we do them at rotomotion, bring them in, we can tell u how good the spray pattern is

So you work at Rotomotion hey Harry.. I have a set of 1000cc injectors there to be flowtested