R33 GTS Non Turbo Fuel usage?

[ferni]

My gf's R33 non turbo's fuel usage seems pretty average. I would of though from a 2.5litre N/A she would get a little better than ~350km per 50 litres... i would of espected closer to 500... i get around 300-350 in my GTR, so surely she should be getting more?

Is it her O2 Sensor? Where is it on the R33 N/A? Anyway to test it... I read a few threads saying if you shake it and it rattles, its dead...

Any feedback? What do other R33 N/A's get to 50L?

[666DAN]

Yeah those figures are shocking...I used to get average 9.1L/100k's in the 34..that was an auto too.

The O2 sensor is on the downpipe from the manifold...similar in location to where it is on a turbo...just a little bit further on.

[ferni]

Whats involved in changing the O2? does anything else need to be removed to get to it? Where would i buy a replacment from?

[The Dan]

You can easily get to the sensor from the engine bay. It will probably be a 22mm hex size spanner you'll need. Maybe 19mm. Unplug it, unscrew it. It's that simple. You can get another one from ACA, I'll get their number for you.

They are at 26 Cross Street Brookvale NSW 2100 Sydney Australia.

PH: (02) 9907 1861

Mobile: 0407 200 061.

Don't worry about the location as they have reps going everywhere.

Before you race off and change the 02 sensor though, check to make sure that ALL vacuum lines are hooked up and secure with no splits or cracks in them. Also buy a can of carby clean and clean out the Air flow meter. Do this while it's running. You will have to pick up the revs manually while doing this as it will try to konk out.

Check the fuel filter ***important***

Use the remaining carby clean to spray around all the vacuum lines. If any gets in through a crack or split or hole then your idle will change and you'll have found it.

I can't think of any other things at the moment but they are the basics.

You could also change plugs and stuff but they are a bit fidly. Recommend them though.

[Ant]

Any feedback? What do other R33 N/A's get to 50L?

I get 9 - 10L / 100k in my GTS25 manual, closer to 10 if I spend a lot of time on the motorway, closer to 9 if spending a lot of time driving round town.

As per other comments check:

- 02 sensor

- AFM

- Plugs

- IACV/AAC valve (do a search if you don't know what this is).

- If you can go to a Nissan dealer and get it checked out with the Consult diagnostics gizmo.

Is it auto or manual? If auto is the 'box changing ok? If manual is the clutch slipping at all?

[The Dan]

Also another thing I forgot...while the engine is running, squeeze the Blow by control hose so it becomes blocked. You should hear the idle change. If it doesn't then you have a leak in your intake somewhere.

[ferni]

Spoke to my mechanic yesterday, mention this to him, he recons the o2 sensor will have very little effect... it only fine tunes it, so wouldn't make too much difference... more likely to be the AFM he says...

Its an auto, the box seems fine, its not flaring between gears or anything, drives perfect....

[The Dan]

try the AFM if you can get another one to borrow for a while but in the meantime...have you tried cleaning it with some contact cleaner or throttle body cleaner. Sometime that's all it takes. The skyline AFM's have the smallest tolerances. Petroject refuse to fix them for this very reason.

[Swordfish19792002]

I also get 9 litres per 100km travelled...so roughly 460-80km on a tank...manual turbo 1993 GTST

but i notcied hot days she may drink a little more....i notcied the other week when it was hot i only got 390km out of a tank.

obviously as hot air is less dense and therefore less air molecules for the engine to combust. So more fuel would be dumped into the engine than air..theortically casue of the temperature.......hope it makes sense