fuel consumption 80 series cruiser

[tallpaul]

Hi.

I have just put another 4.5 litre motor in my 80 series landcruiser, and the around town consumption is around the 21 Litres to the 100, the older motor that was in it seemed to be getting better fuel consumption.

I filled both tanks about 2 weeks ago did 550 K and put 116 litres in, that should equate to about the 21/100.

Is anyone else getting that sort of fuel use around town, as i would expect 16-18 around town.
When i first bought the 80 Series i did a trip to QLD and on Hwy cycle I was getting about 12.5 to the 100.
Could anyone suggest if the problem may be mechanichal????
Not a leadfoot. Tall Paul Newcastle:waycool:

[gtir300]

I get about 20-25l/100km with 4" lift 33 muds and roofrack. I need to check and replace ignition components to see if I can improve this tho!

I would suggest checking all fuel connections from when you did the engine swap. Also check the oxygen sensor, these things do play havoc with fuel economy when they stuff up. Other things would be ensure the timing is set correctly. Silly but check the brakes arent dragging too.

Dunno if you get it down to the 12.5l/100 (thats an incredible figure, well done!) but the above should help.

[ookami]

On the way to a job site this morning i grabbed the sept issue of the magazine and was just now reading the 80 vs 100 vs 200 article and saw that the 4.5L petrol 80 had the best fuel ecconomy of 13.6L on the test. One thing you can try is replacing your O2 sensor in your exhaust, this alwasy made a huge difference to the Nissan RB series vehicles i have owned over the years. Do the 4.5L have a AFM or Map sensor?

[Sic Lux]

AFM. Check the ducting on the whole intake system starting to see more and more of these crack with age not only on 80's like always check plug leads coil lead and coil for restistance also cap and rotor condition compression test the engine and maybe throw a set of plugs at it.

[tallpaul]

Thanks for the replies.
I will take all that on board and work through the systemto try and find the offending part or parts.
tallpaul .
Newcastle, Home of the Watagans stockton, and Mount sugarloaf tracks.:truck:

[Pigdog]

On the way to a job site this morning i grabbed the sept issue of the magazine and was just now reading the 80 vs 100 vs 200 article and saw that the 4.5L petrol 80 had the best fuel ecconomy of 13.6L on the test.
I must admit I had my doubts when I read that.

[MONTY42]

I've got a 94 GXL 4.5 Litre with 5" Suspension Kit pushin 315 MTZ's with all the heavy bit's and pieces. I average around 17 litres per hundred. I got mine dyno tuned to check all the sensors but mainly to play around with the timing. If you look through the Toyota Tech folder and ask for the timing advice some one should have the how to do instructions to advance it as this helps, but be careful as you don't want it to ping.
Also I was a big sceptic about the whole Premium versus regular unleaded until I tried it, I get 100+ more km's out of the two tanks.

[cape_ablecruiser]

I've got a 93 GXL 4.5 with OME 2" and 33 BFG MT's and get 13.4l's/100 when driven about 20% round town under light foot) and 80% highway unloaded.
Recently it started performing poorly and the fuel consumption went to 16 to 18 litres / 100. She's got 287 000 kms on the clock now so I figured the motor was on the way out. I took it to Toyota for an engine assessment and mechanically she came back fine with 190 - 200psi per pot. (the money spent on mobile 1 over the years may be paying off!).
Toyota said my air flow metre was stuffed. This may have been caused by oil from my unifilter travelling through the meter.
As mine is the old vein type metre I wasn't convinced. They wanted $1100 for a new one plus fitment.
Sure enough when I went home and pulled it apart they were correct.
I have cleaned it all out with contact cleaner. Cleared the codes from the ECU (I wish I would have checked them before taking it to Toyota!) the ECU codes were showing code 24 - intake air temp sensor and code 32- air flow metre circuit. She's all good again and the fuel consumption back to normal.
I now run the Toyota air filter again. Anyone want to buy a used Unifilter in good nick? :)
CC
PS Monty 42 - these fuel figures run on 98 octane. 14.2 l/100 on 91/92 octane over the same roads to work. This also works out to around 100km extra over the 2 tanks.

[Judgey]

cape_ablecruiser

How were you able to get the codes from the ECU?

I have a 93 GXL 4.5 as well

Thanks

[tallpaul]

I got my mechanic to test the oxygen sensor today, and it would appear that it is stuffed.

Can you clean these????
New One.....$320 from Mr Toyota san
Repco $290
Anyone know where else you can get an aftermarket one....

One from Wreckers?? Might get another one thats stuffed.
Any sugestions.Tall Paul:truck:

[cape_ablecruiser]

cape_ablecruiser

How were you able to get the codes from the ECU?

I have a 93 GXL 4.5 as well

Thanks

Judgey,

I got most of them straight out of my Gregory's Manual.

I have been able to gleen a couple of others from some toyota mechanics over time eg.
The exhaust O2/temp sensor fault for the 80's is code 21 or code 28 if you have a 90 series prado.

Cheers

CC

[cape_ablecruiser]

I got my mechanic to test the oxygen sensor today, and it would appear that it is stuffed.

Can you clean these????
New One.....$320 from Mr Toyota san
Repco $290
Anyone know where else you can get an aftermarket one....

One from Wreckers?? Might get another one thats stuffed.
Any sugestions.Tall Paul:truck:

Tallpaul

3-4 years ago i replaced one which cost $300 fitted by Toyota.
I couldn't find a decent alternative at the time.

Since my previous post on this subject I have managed to find a local company that refurbs some electronis eg the mass air flow meter.
They do a referb for $300 with waranty so you may find something.

Goodluck!
CC

[cape_ablecruiser]

BAd TyPOs CC!

[Oz Cruisin]

I got my mechanic to test the oxygen sensor today, and it would appear that it is stuffed.

Can you clean these????
New One.....$320 from Mr Toyota san
Repco $290
Anyone know where else you can get an aftermarket one....

One from Wreckers?? Might get another one thats stuffed.
Any sugestions.Tall Paul:truck:
I just got a quote today from repco coopers plains brisbane for $127,i've a 93 4.5 myself going threw the same motions 250km/80L towing around town.You can also get a GREGORY'S work shop manual for a 4.5 between 92-98 from drysdale auto books at bowen hills qld.All the other books cover to many models and motors.:crazy:

[tallpaul]

Went to supercheap auto this morning.
Apparently they should be able to get an oxygen sensor from SA for about $110 plus postage.

Thanks for all the advice.
Hopefully a new sensor should rectify the Problem
Tall paul
Newcastle:truck:

[cape_ablecruiser]

Went to supercheap auto this morning.
Apparently they should be able to get an oxygen sensor from SA for about $110 plus postage.

Thanks for all the advice.
Hopefully a new sensor should rectify the Problem
Tall paul
Newcastle:truck:

Great News Tallpaul. I look forward to hearing how it goes.

When I have replaced/repaired anything in the ECU circuit in the past on my 80, I have found it fairly slow to tune in to the replacment/repaired part.
The Gregorys manual will tell you to remove the EFI fuse to reset any fault codes in the ECU. This definatly works but in my experience it's still slow to tune in.

I have found mine tunes in faster by disconnecting the battery, which seems to completely reset the ECU.

I'd be interested to hear what others have found.

Cheers CC.

[tallpaul]

How the hell do you get the oxygen sensor out???
Toyota has conveniently located it under the drivers side , with an angled surround on it, Most likely to suppress spray from the drivers side wheel.
It looks as though the sensor was put on the exhaust first then the exhaust bolted up.
I have side steps mounted as well, so the supporting rail for that is also in the way.
looks like a half a day on the mechanics hoist to remove it.
Could an exhaust shop mount it closer to the manifold for ease of checking or removal, I could just unplug the connector and move the sensor up further into the engine bay...
Where toyota have located the sensor on the 80 series seems really stupid, as thats where you cop all the water, mud and other crud..
Any suggestions.
Tall paul.
Newcastle:truck:

[cape_ablecruiser]

TallPaul,
My next comment is only hearsay so I'm more that happy for someone to clarify/confirm/deny.

I think the o2 sensor also monitors exhaust temp on some models. If that is the case the question I would be concerned about was if you moved the sensor too close or too far from the original (read from the exhaust manifold) spot would the change in temp effect the tuning circuit?

Any one with any thoughts or can clarify?

I have an after market exhaust so I can't help re how to get to it.

CC

[davepom]

na mate the o2 sensor does not monitor engine temp, it does however need to get to a certain temp before it will operate now on the 80 i think it has a three wire o2 which means it has a heater inside it to allow it to warm up quicker .

[pdr]

I have 92 4.5 and was just wondering exactly how to get codes from ecu. Mine is using about 20 liters a hundered on the highway and am thinking i would like it a bit better, I do have front and rear steel bars and a roof rack but fuel consumtion still seems a bit high from what others have been saying.

[No Fn Idea]

Hey TallPaul

How'd you go with the o2 sensor?? Did it improve your economy at all?

I just got myself a 93 GXL with the 4.5 and would like to get the best economy I can. I'm gunna clean the AFM to see if that makes a difference. And then I'll look at the o2 sensor to see if that is stuffed.

I got a code reader in the pile of spare parts I got with my cruiser - I have no idea how to use it or even if it works but it sounds like I'll have fun on the weekend figuring it out.

Cheers
Nick

[steve80]

The mileage you guys are getting I would have loved to have gotten I dont have it anymore but I had a 94 mdl 4500 auto on dual fuel A/T's 2 inch lift roofrack bullbar usual stuff and the best I ever got was I think about 28/100k's averaged 30-31/100k's. For 90 litres of fuel I got about 300 k's so there is a comparison for ya. I had everything checked 02 etc etc etc dynoed 4 times.:( :( :( Oh and it had only done about 230 k's.

[tallpaul]

Got the old sensor out replaced it with a newie.
Fuel consumption now down to 16/17 litres around town and some freeway driving to work.
My 80 is an auto so it probably chews a little bit more juice.
I am going to also go through all the electrical side as well to see if I can improve things a bit.
Thanks for all the advice.
Tall paul
Newcastle:truck:

[No Fn Idea]

Well I still haven't done anything to improve consumption yet but here are my pre fiddling consumption numbers

Petrol
450klms on 90L = 20L per 100klms

Gas
220klms on 66L = 30L per 100klms
300klms on 78L = 26L per 100klms

Seems pretty thirsty for me even though it is an 4.5L auto. My gas consumption is more than 120% of my petrol consumption so I think I have a general over consumption issue. And by the smell of it I may have a gas leak to chase down as well.

Ohhhh the joys

Cheers
Nick

[No Fn Idea]

The figures above for petrol are wrong. The more accurate (and reasonable) figures are below after today's fill up

440klms on 78L of 91RON = 17.75L per 100klms.

This is a much better figure and using this as a base it means that with gas I should be getting a figure about 20% more than that for LPG - this means I'm chasing just under 22L per 100klms for LPG. The best I've got so far is 26L per 100klms so I've got some work ahead of me trying to find improvements in gas consumption.

Cheers
Nick

[nate]

ok i know there a big car but also a big engine, are they quick? (not like a rocker) but do they get up and move? compared to a v6 jackaroo?