Jump to content
SAU Community

Im Getting Bad Fuel Economy

sky-017

By sky-017,
in General Maintenance

 Share

Recommended Posts

sky-017 Proficient

sky-017

Posted
Posted

im down to a qauter of a tank and iv only done 180 kms , mind you i havent really boosted it much . the highest its been hit to would be 3-4 psi , like once or twice overall . what can i do to remedy this problem , a friend told me to get a new o2 sensor . are there any other ideas that anyone has know of or tried?

much appreciated , thanks

Link to comment
https://www.sau.com.au/forums/topic/172611-im-getting-bad-fuel-economy/
Share on other sites
Modena Grand Master

Modena

Posted
Posted
im down to a qauter of a tank and iv only done 180 kms , mind you i havent really boosted it much . the highest its been hit to would be 3-4 psi , like once or twice overall . what can i do to remedy this problem , a friend told me to get a new o2 sensor . are there any other ideas that anyone has know of or tried?

much appreciated , thanks

Get a new o2 sensor. Around 100 bucks from here:

http://www.skylinesaustralia.com/forums/in...howtopic=135194

Baconer Grand Master

Baconer

Posted
Posted

check that the fuel gauge is reading correctly (note how much you fill next time you get petrol)

also i had a problem with the A/C unit being faulty so i just keep the recirculate button on unless im using it

another thing is to clean the aac valve (tutorial on site)

i went from 280 to 400km a tank after doing those things

Modena Grand Master

Modena

Posted
Posted
how many more kms could this give me ?

I too have an R33 S2 GTS-T with 64000 KMs. Mine still has the old (I believe anyway) o2 sensor and I get 420+ KMs to a tank regularly. Mine only has turbo back zorst as a mod. Its also auto so drinks bit more than manual when cruising.

Other things to do which improves fuel economy:

Get a fuel injector cleaner, any auto shop has them.

Check /change your air filter

That should give you better economy.

RBwhatever Veteran

RBwhatever

Posted
Posted (edited)
My car stalls on the spot if AFM is unplugged.

Weird. Mine didn't. It idled a bit higher than normal but consistant, and also on idle your could see black smoke coming out of the exhaust, hence really rich. I forgot to plug it back in after fitting the cooler.

Edited by KeyMaker
Modena Grand Master

Modena

Posted
Posted
Weird. Mine didn't. It idled a bit higher than normal but consistant, and also on idle your could see black smoke coming out of the exhaust, hence really rich. I forgot to plug it back in after fitting the cooler.
Yeah cos when my AFM was playing up (loose solder in the electrical contacts) when I moved the AFM around the car would hunt and then stall depending on which position I had the AFM in 9unsecured without a brace). Then once we unplugged it, the car just stalled on the spot.
sky-017 Proficient

sky-017

Posted
  • Author
Posted

if this helps seek more info :

my mods are :

pod filter

turbo back exhaust

bleed valve

fmic

no tuning or moded computers.

i have recently cleaned the afm / ACC valve ... all plugs have been checked . although i am now considering purchasing a new o2 sensor , as this is all im left to direct the problem too . might try injector cleaner .

also sometimes i get a bit of a back fire ... couldnt that be to do with the fuel problem?..

help appreciated - thanks

TramanBaba Community Regular

TramanBaba

Posted
Posted
check that the fuel gauge is reading correctly (note how much you fill next time you get petrol)

also i had a problem with the A/C unit being faulty so i just keep the recirculate button on unless im using it

another thing is to clean the aac valve (tutorial on site)

i went from 280 to 400km a tank after doing those things

Well the ac recirculate button being on does make a difference. I can vouch for it. But not too much i'd say. Around an extra 20-25ks. Thats about it. But looking at yours even that'd be great. Yes the AAC valve cleaning helped me out a bit as well. i was getting 330ks, no super mods, but after doing these things went upto 360 in summer and 380-390 in winter

IMPUL_R33 Apprentice

IMPUL_R33

Posted
Posted

best way to check if its running rich is to put it on a dyno and check A/F ratios, Best way to have the injectors cleaned is to have them removed from the fuel rail and ultrasonicly cleaned and flow tested. This can be a pain though not only to remove them from the engine but to get them out of the fuel rail as the sealing 'o'-rings have a habbit of growing. One thing you didnt mention was your driving conditions Town/highway, stop start at traffic lights etc. I have ECR33 FMIC HKS pod 3" exhaust increased boost, get on average 400km to a tank. If you have never had your injectors ultrasonicly cleaned might be a good place to start. Check performance shos / workshop in your area to see who has the gear, But make sure you ask them if they have the equipment to flow test your side feed injectors as some places dont. Anotherthing to check would be the catalytic converter, when the car is complianced this is replaced usually with the cheapest one available, they usually dont flow to well and the honeycomb inside collapses and restricts flow even more, robbing you of power and making you put your foot down further on the throttle using more fuel. hope this helps. :)

Modena Grand Master

Modena

Posted
Posted
Well the ac recirculate button being on does make a difference. I can vouch for it. But not too much i'd say. Around an extra 20-25ks. Thats about it. But looking at yours even that'd be great. Yes the AAC valve cleaning helped me out a bit as well. i was getting 330ks, no super mods, but after doing these things went upto 360 in summer and 380-390 in winter

Ha? You mean the closed air vents button? From what I know it only just blocks the air vents, it doesnt drain any energy (recycles the cabin air). I usually have it on in the city and open it up in the country area where the air is fresh.

Craved Grand Master

Craved

Posted
Posted
Ha? You mean the closed air vents button? From what I know it only just blocks the air vents, it doesnt drain any energy (recycles the cabin air). I usually have it on in the city and open it up in the country area where the air is fresh.

AAC = Auxiliary Air Control

the valve is located on the plenum and is not related to the air conditioner.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • JC71
      new 1.5 LSD issues/concerns

      By JC71 · Posted

      sold listed as a Tomei LSD 1.5 Way For 1998+ Nissan Skyline ER34 25GT RB25DE w/Open R200 https://www.ebay.com/itm/174006114594?campid=5338967980&mkevt=1&mkcid=1&toolid=10050&customid=&mkrid=711-53200-19255-0&loc_physical_ms=108689&loc_interest_ms=&campid=5338967980&mkevt=1&mkcid=1&toolid=10050&customid=71883f2ccc571356e0a757bc7adfdde2&mkrid=710-53481-19255-0&loc_physical_ms=108689&loc_interest_ms= it went in like butter all gears, alignment, back lash etc, rotation and clearances correct, and if rolling all rotates smooth and free when coasting down road , clutch in or out over 10 mph smooth... its the binding, clunking and jerking from a stop that is most concerning, also seems like its going to tear the tires off in 10 miles of normal road driving. 
    • Kinkstaah
      new 1.5 LSD issues/concerns

      By Kinkstaah · Posted

      What 1.5 way? There's no such thing really as a 1.5 way, just different ways of explaining 2 ways with different ramp rates. HOWEVER. In any driving in a straight line your 1.5 or 2 or 1.7 way should have no clunking at all. With the clutch fully depressed the diff should be silent (unless it's welded but I'm assuming it's not). Something aint right here.
    • JC71
      new 1.5 LSD issues/concerns

      By JC71 · Posted

      Clutch is a spec brand, new clutch system,( PP, flywheel, friction disc, etc. pull type) installed 100 miles ago, with no problems.
    • JC71
      new 1.5 LSD issues/concerns

      By JC71 · Posted

      looking for some help and maybe some insight on others experience with a new LSD. R34 GT ran and drove beautifully, but always alot of grip loss due to the open R200 rear end, so I just installed a new 1.5 LSD way into the stock open R200 for a ER34. Simple. Everything seemed right. I test drove for the first time this weekend. as I started to back out the garage the first time slowly with tires straight it sounded and felt like I had a loose or half disconnected drive shaft...that was clucking around loose and shaking entire vehicle, and making it feel like the trans clutch was spontaneously slipping then grabbing very roughly while just letting out pedal slowly. I backed it out went to pull forward with the same noise, shake and slip grab feeling with hesitation, I turned the tires to back out more and then pulled ahead some same thing but worst because of added wheel resistance (which that I expected) puzzled … pulling it back in checking everything over and finding nothing wrong, I tried it the next day. same thing, couldn’t believe how it shook everything again making a terrible noise and making it feel like the trans clutch was slipping and grabbing, but I got it out of garage into the driveway, got it straight, drove forward and then reveres a few times in a straight line everything shaking , causing what felt like clutch slip and grab every time, sounded like right behind front driver tire and I could feel it in the floor board with my feet,... worst right when beginning to let clutch pedal out to engage slightly, shuttering and sounding terrible along the way…I managed to slowly get down the road, babying it the whole way, once I was rolling (out of 1st) seemed to be better and between shifts, then clutch felt closer to normal…not slip/ grab etc., but back down to any stop, straight road or turning, same thing. Made no difference if all tires were straight or if I was turning. All other gauge read out correct. with in 2 miles as planned I reached the empty parking lot and performed the break in procedure that came with lsd, essentially to drive in a figure 8 a bunch.  Did this, binding chattering, and shaking the car the whole way. I drove it back home seemed somewhat normal once I was in straight line and past 10 mph or so, and I know it will “bind” on corners and cause some tires squeal when turning especially from a stop, but when I begin to move it still causes what feels like the trans clutch to slip and jerk badly as well as shaking the entire car, and sounds terrible, that I didn’t expect. I used the fluid they supplied with LSD kit and did the breaking, planning to change fluid as they suggest after breaking, but wondering will it get smoother or less aggressive with use? maybe a 1.5 is just too aggressive for normal road driving?   I have a LSD that I put in my 71 cuda when I restored it, with amazing smooth , quite yet effective results. Different style LSD but that ones a joy to drive. maybe expecting too much from this R200?
    • Matt Z
      SAU NSW - Archies Flame Grille Meet & Cruise to Kurnell

      By Matt Z · Posted

      Join SAU NSW for a flame-grilled feed & flame-spitting cruise! Sunday 17th August 2025 3:30PM Meeting Archies Flame Grille Sylvania Waters 4:45PM Cruise Departure 5:15PM Arrival at Cape Solander Kurnell Meet Location: Archies Flame Grille Final Destination: Cape Solander Kurnell *Disclaimer* There will be a lead and follow car so no one should get lost. If you would like to attend or bring others along please put your name down and a +1 as numbers will be needed prior! This is NOT a race and we will all be adhering to all road rules. If this is what you want please come to one of our many track days. This is an official SAU:NSW event and will be run under a CAMS permit. One of the things that really sets our club apart is our commitment to being true enthusiasts. When on normal roads we strive to maintain good relations with the authorities as well as the public in general. When attending one of Skylines Australia NSW events please try to: • Be aware of surrounding environment and act accordingly. • Drive courteously on the state’s roads as a true enthusiast should. • Understand how important it is to maintain the good name of SAU NSW and thus, treat others accordingly. • Any misbehavior will not be tolerated and you will be asked to leave.
×
×
  • Create New...