Bad fuel economy

[har05l]

That would be me then lol. I am lucky to get 450km out of a tank most times i fill up.

At what point do you fill up, when the fuel light comes on

I'm playing around with different servo's ATM to compare. So far have done Caltex (woolies), Shell and now on BP. Will post differences after a few more fill up's.

I've also noticed that by housing out the radiator my fuel usage has dropped, for the guys that have a few km's clocked up and do a bit of offroading you'd be suprised at how much dirt you'll get by giving it a good hose

I know for the newer vehicles this wouldn't apply but just be patient and let the thing free up a bit

[mIwoo]

Just for interest sake I'll post what I've found.
First trip- 2 weeks old. Hard cover, 80/20 at's got less than 7.8/100km on a 1000 km trip. That was measured from completely full to measuring parralel with empty sign. Now with no hard cover, bull bar 9" spotties and 31" MT's getting around 12-13L/100km (both town/hwy kms). I find that it's useless going over 2200 revs or 110 km hr or I chew juice. Am thinking I might change my mt's later but that's due to not actually needing the mt's... Or the sound that comes with... Not so worried about the juice they chew!

[dan_4818]

That's just after the fuel light comes on. But with about 40-50km added to allow for it

[Sky Miner]

Ok did a fill up and wasn't far off it used a 100ltr for 800k's roughly
works out to be 12.5ltr's per 100ks.....with all the fruit..good enough for me
+ the sprint booster makes a big difference...turn it on... run em hard...pay the price.

[Cowboy Dave]

I'm getting high 13's most of the time. I drive it harder than I should and carry too much stuff but I have buckley's chance of getting under 10 litres per 100 like some of you.

[dan_4818]

yea i have canopy aswell. And my drawers are always in my car, aswell as camping gear. So thats probably it. Doesnt explain the smoke though

[Cowboy Dave]

No the smoke makes it sound like you are running rich - if it was black smoke that is. Check your air filter and MAF sensor?

Also I see you are running a chip - that'll do it too. Try going to a lower tune if the black smoke is bothering you.

[odie602r]

On a side note, out of curiosity, I'd like to run my air fuel meter on some of these fuel pigs. Any up around high 12's to 14's under light use is out there I think.

Tony - can you provide any more info, or figures or something regarding what the air/fuel meter readings should be...

As a very rough guide..... light cruise up to 40:1, light to medium load - around 21:1, full snort - down to high 14's and back to around 18:1 to 21:1 depending on tune etc.

Any thing below mid 14 is very bad as there is literally no air left to burn and will smoke like proud merry.

So if the air/fuel readings are out, what can be done to correct it? Is it Mitsy-mechanic-only territory?

[irwazza]

Tune

[Sutty]

for all of you that have put new exhaust on and not getting better fuel economy check that you still have an oxygen sensor hooked into the exhaust as i noticed that someone said theres had been disconnected wires cut. the sensor has big part to play in fuel injection timing and amount injected for each fire. if its not connected the ecu may be getting a false reading and putting more fuel in for each fire.

[trouble]

No wires connected anywhere near my exhaust. ?????

[Mooons]

No wires connected anywhere near my exhaust. ?????

Same here ??????

[snowman]

i think he is sniffing petrol boys

[Mooons]

i think he is sniffing petrol boys

That can't be good for ya

[Sky Miner]

Mayby the wires melted off when it left the factory ........hmmm bitsamissin

[Thommo3337]

The mn Tritons are pigs once you get them on to the freeway!! Anything over 100km and they drink sat on 120 112 on the speedo and the consumption went up to 12.7l average to young nsw from Melb I got better economy driving at 100km going round tight bends up hill etc is their anything cheap that can be done they need another gear!!!? Someone else had really bad economy with the snorkel fittment it had some plastic or packaging stuck in there... Good luck with it

[mIwoo]

ok.. so now i am worried.
i have just done 10000 kms in a short time... (month)
I was getting close to 10l/100 km on road for quite a while whilst away (combined with 31" MT, bullbar and lights and about 200 kg weight in the car) then suddenly it went crazy- lost that 'boost feeling' when the turbo hits the sweet spot (1800-2500 revs), am now getting 21 l/100 kms around town and 14 l/100 km on highway and it generally feels 20% more sluggish. Its harder to get going, really have to rev it, damn noisy, and i've checked my fuel filter, blew out the air filter (damn clean really considering how filthy it was at 30k service and getting good economy/ function), cleaned the maf sensor and ran some injector cleaner through it... i am not getting engine lights however i do not have ability to recognise codes either... i have spoken to my service manager and he reckons that it needs a SQL. After the rubbish last time of not looking at fuel economy and only doing a SQL which did nothing (14000 km ago I was getting 9-11 l/100 km with all the fruit and fully loaded) I am not convinced it needs a sql. I am sure they didn't do my tappets at the service however they are insisting they did. I did get one bad tank fuel whilst away. But at the time i didn't feel any effects from it. Prior to this event I was starting to get surging again (have had the EGR valve and mannifold replaced for carbon at 13000 km) in second gear.
Suggestions.

[mIwoo]

anyone?

[TUFF TROOP]

I have a ml manual glxr with arb front bar with winch, spotties 6mm ss bash plates, arb side bars with plate welded down to turn into sliders, arb rear bar, 125lt tank, arb canopy with internal roll cage, drawer set up 110lt fridge, rear battery, arb tradey rack with rooftop tent and 50" led light bar, Plus all the other accessories, and run 16x10 wheels with 33s on them and also full 3" turbo back stainless system with no mufflers or cats, loaded with all our camp gear wood etc I get 10-11lt 100s if I Sit on 105kph,
If I sit on 90-100 I get under 10lt per 100ks,
I'm running dp chip egr blank, catch can, airtec snorkel, k and n filter, sprint booster.
I also run the latest software update and do regular injector recalibrations also.

This weekend I'm pulling my motor down to check injectors, do valve clearances and do some more tweaking, and ill also try out the swirl control mod as haven't done it as yet.
Mine has done 206000ks now. And has never missed a beat! Touch wood.

I'm happy with it, also try some different servos, I find bp to be best in my town.

At the end of the day they still make fuel. My project clubsport on nitrous runs on 115 octane elf fuel. 90lts lasts around 200ks if that. So the triton is like a Prius to me haha

[Belbrook]

apart from a bad electrical connection somewhere or an ill fitting hose it sounds like youve done all other obvious things.
I'd be off to the stealers.
Good luck problems like this are a real PITA.

[snowman]

ok.. so now i am worried.
i have just done 10000 kms in a short time... (month)
I was getting close to 10l/100 km on road for quite a while whilst away (combined with 31" MT, bullbar and lights and about 200 kg weight in the car) then suddenly it went crazy- lost that 'boost feeling' when the turbo hits the sweet spot (1800-2500 revs), am now getting 21 l/100 kms around town and 14 l/100 km on highway and it generally feels 20% more sluggish. Its harder to get going, really have to rev it, damn noisy, and i've checked my fuel filter, blew out the air filter (damn clean really considering how filthy it was at 30k service and getting good economy/ function), cleaned the maf sensor and ran some injector cleaner through it... i am not getting engine lights however i do not have ability to recognise codes either... i have spoken to my service manager and he reckons that it needs a SQL. After the rubbish last time of not looking at fuel economy and only doing a SQL which did nothing (14000 km ago I was getting 9-11 l/100 km with all the fruit and fully loaded) I am not convinced it needs a sql. I am sure they didn't do my tappets at the service however they are insisting they did. I did get one bad tank fuel whilst away. But at the time i didn't feel any effects from it. Prior to this event I was starting to get surging again (have had the EGR valve and mannifold replaced for carbon at 13000 km) in second gear.
Suggestions.

economy effectively half of what you used to get should be easily diagnosable. that is not a bull bar or large tyre issue. Take it to your dealer. if they are not interested or cant find an answer then taker it to another one who will or can.

[TUFF TROOP]

I have had a triton in at work with simmilar issues. Ended up being 3 faulty injectors due to poor fuel..
Replaced injectors and was fine again!

[mIwoo]

mmm... mits are saying ive got bad injectors however have to supply 3 fuel receipts first before mmal will approve the injector replacement- if they do. has to below a certain number before they replace them.

I'll see in a couple of week what they say after I supply them.

My dealer also said if its bad fuel they wont replace them under warranty. $4000 out of pocket if thats the case. Not good!

[mIwoo]

I got thinking about this... without my stealer installing an scangauge or the like on my ute there is no way they could know how much fuel I was using or what load my ute was under during this period of gathering data is there? They can only calculate fuel economy by 'calculating at the pump method', yeah? (MN GLRActiv)

Soooooo theoretically I can run the vehicle a little harder to help my cause? I dont like being dishonest but I'd rather MMAL replace my injectors now before the problem gets much worse. MMAL are reluctant to do it unless they agree that it's 'excessive fuel usage'. Who knows what this 'excessive usage' number is.

Its bad enough now that i'm only getting 380 kms a tank unladen around town, 500 on hwy now (maybe 580 if i drive ULTRA ULTRA CONSERVATIVE with next to no weight). I used to get 680/ 760 15000 kms ago. And the damn ute only has 39 000 kms on it with nil further fruit additions.

Anyone got any idea's on this?

Cheers.

[Cowboy Dave]

Here's one idea, if you're thinking along those lines, don't post about it on a public forum where MMAL employees are known to lurk... Those figures are pretty crap without any extra help I would have thought.