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ikad Profile
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Date Registered: 11-2012
TOTAL POSTS: 7
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posticon t-30 poor fuel economy


hello i have been trying to obtain current fuel figures on the t-30 2.5 auto using 95 shell or caltex we are currently around 8/km/ltr or 12.5 ltr/100 km and as low as 5/ltr h/way when towing a camp trailer at around 500kg i beleive this is poor economy. I service the vehicle at 5k intervills and have checked the cat converter for dammage any suggestions thanks ian
4/Nov/2012, 6:37 pm Link to this post Send Email PM   Send Private Message Blog
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: t-30 poor fuel economy


You'll need to change both CAM and Crank sensors if you haven't already.

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4/Nov/2012, 9:17 pm Link to this post Send Private Message MSN Blog
 
DJR9000 Profile
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Date Registered: 08-2012
Location: Blue Mountains NSW
TOTAL POSTS: 169
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Re: t-30 poor fuel economy


How many Km on the odo? If it's over 150,000K it's possible the O2 sensor needs to be replaced to restore fuel economy. If it's a series II there are 2 sensors and if it's a series I there is just one to replace, while the O2 sensor is being replaced the exhaust manifold should be inspected for signs of catalytic convertor breakdown.

Couple of other things to check - air filter element, sparkplugs, injector cleaning

I was getting poorer than 10L/100Km on the highway before the O2 sensor replacement in my manual 2.5 series I, with the O2 sensor replacement it has been a lot better, about 8-9L per 100Km on the highway. Mind you I had a bit of other work done at the same time...



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Ben
Hazelbrook, Blue Mountains NSW
2002 T30 Ti Dark Blue Mica
5/Nov/2012, 10:49 am Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 11-2012
TOTAL POSTS: 7
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Re: t-30 poor fuel economy


thanks Ben it has approx 180k the cat i have just inspected with the aid of an inspection camera and all is OK.could transmision service and drive line oil change help as it should be due thanks ian
5/Nov/2012, 8:51 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 08-2012
Location: Blue Mountains NSW
TOTAL POSTS: 169
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Re:


I doubt changing transmission oils will make much of a difference at all, but if you have done lots of towing or offroad work or it's been more than 80K kms after the last transmission, transfer and diff oil change it's probably worth doing.


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Ben
Hazelbrook, Blue Mountains NSW
2002 T30 Ti Dark Blue Mica
7/Nov/2012, 12:36 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 05-2012
Location: Sunshine Coast
TOTAL POSTS: 481
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Re: Re:


12.5 l/100Km does look like poor economy for normal unladen driving.

The average from Spritmonitor would seem to be about 10 l/100 Km depending upon the degree of stop/start city driving, driving style and whether or not you have to climb hills regularly.

However, some people log much higher fuel usage than yours.

Every environment, car set-up and driving style is different so it is very hard to offer generalised solutions

If you get the chance, measure the usage after a relatively easy 200 Km highway run at 100 Kph.

Before you start, fill the tank to the brim: ie give at least two more trigger hits on the pump after the auto shutoff to allow the fuel to settle in the pipe and fill it completely.

Set the tyre pressure at about 38 psi front and 36 psi rear. That will eliminate a lot of rolling resistance but maintain some level of comfort.

Do your drive, remembering that every time you re-start the car you pump 100 Ml of fuel through the injectors : that 100 ml could give you another 1 Km extra in that litre of fuel.

Drive as if you have a raw egg strapped between the accelerator and your right foot.

Do choose a relatively level journey as hill climbs murder economy in the X-Trail.

At the end of the journey (distance is not critical but it would need at least 100 Km total to be statistically significant) refill the tank to the same level - at least two stops on the auto shutoff from the fuel pump, then crunch the numbers..

I would expect about 9.5 l/100 Km as a maximum for a level run at 100Kph.

Add 20% for 110 Kph - wind resistance is a !@#$.

You may be pleasantly surprised at the economy for that trip.

If you are not ... then after having eliminated some variables and if it still sucks fuel like a vampire in a blood bank, then it looks like a mechanical / sensor problem as suggested previously.

It is unlikely to be the oil.



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2011/12 Australia:- 2.5 litre petrol 4WD, Series IV ST, CVT with Nissan bonnet & headlight protectors, mats + after-market HD towbar with added step for old dogs. ;) Garmin GPS, K&N air filter, DashMate, Black Pearl Tint , Dirt. X-2429(c).
15/Nov/2012, 9:29 pm Link to this post Send Email PM   Send Private Message
 
ikad Profile
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Date Registered: 11-2012
TOTAL POSTS: 7
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posticon Re: t-30 poor fuel economy


hi again after my original post several weeks ago we have just serviced the injectors the mechanic commented they were not the worst seen but needed to be done partial obstructed. the result is a little more power and better economy now giving 8.5 km/l around town and 15 km/l h/w with air con running constantly due to the heat, my original checks showed 7.5 km/l maybe 10 km/l h/w this was without air running . I dare say the problem may not have happened if not for ethanol fuel we will not be using it again
17/Jan/2013, 8:19 pm Link to this post Send Email PM   Send Private Message Blog
 
The XX Profile
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Date Registered: 08-2012
Location: Cowra, Nsw
TOTAL POSTS: 9
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Re: t-30 poor fuel economy


Just to add to this I also have a camp trailer, Cowra to Moruya over new year mine used 11/100 with the trailer on and air-con about 40% of the time. Coming back it was about 14/100. That Clyde mountain is a killer for fuel economy emoticon

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2007 ST-S Auto, Black Obsidian
1/Feb/2013, 10:31 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 06-2008
Location: Blue Mountains, NSW
TOTAL POSTS: 5966
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Re:


Yes the Clyde is a monster of a mountain, gotta love those hairpin turns at the top.

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Tony X-891c

HERE is my D22 Navara
HERE is my old 2008 T31, ST Series1

2/Feb/2013, 6:56 am Link to this post Send Private Message
 
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Date Registered: 11-2012
Location: Broome
TOTAL POSTS: 547
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Re: t-30 poor fuel economy


I was getting 15.4L per 100km, after cleaning the MAF sensor and replacing the O2 sensor im gettin 12.2. Sounds like I can get a bit better so it looks like the CAM and Crank Sensors are next.

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Cheers
maxgmoore X-2776 (c)
My Ride
2003 Series 1 T30 Ti

21/Aug/2013, 9:10 pm Link to this post Send Email PM   Send Private Message Blog
 


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