gas guzzling 100series

Submitted: Wednesday, May 21, 2003 at 19:43
ThreadID: 5059 Views:1436 Replies:4 FollowUps:12
This Thread has been Archived
I have owned a RV manual petrol for nearly 2 years, and up to about 6 months ago consistently got between 15 &17 litres/per 100kms. In the space of 2 tanks of fuel i saw this plummet to 22 l/p/100km. The car has been back to Toyota several times, but they say there's nothing wrong. They think i'm nuts.
I recently took it to a performance expert, where it was dyno tested and the fuel system fully cleaned. On the dyno the car produced above rated power and everything appeared normal, except for high exhaust emmissions of CO and hydro carbons and the timing being retarded by over 5 degrees from guidelines. The CO was level was 2% compared with 0.2% on 2 other landcruisers, and as we know CO is a by product of combustion and hydro carbons are unused fuel, and about the timing, it may be the cause, but how do you change it? Even Toyota doesn't know.
I've read the article posted by Tony, last September (ID2033), and the responses, and would like to know how he got on or from anyone else with a similar problem. And yes, i read all the responses about 20l/p/100kms being normal for a petrol and i might have believed them except for the fact i got alot better for 18 months, as have many petrol owners i have talked to.
By the way, following the last work done on it, the economy was back up to 17l/p/100kms, but this lasted for only 3000klms and is now back to 22l/p/100kms.

Back Expand Un-Read 0 Moderator

Reply By: Dozer - Wednesday, May 21, 2003 at 19:57

Wednesday, May 21, 2003 at 19:57
I bet you have bad fuel! If your motor detects pinging, it will automatically retard timing till it stops pinging. Dont think you can hear it ping either, as you are hard placed to hear it on a dyno. If you dont get any satisfaction with Toyota, take it to a unichip dealer who is more into solving problems like this and see how you go there... I dont know where you are but search under unichip should get you somewhere.
Andrew 20l/100km auto 80
AnswerID: 20710

Follow Up By: Michael - Thursday, May 22, 2003 at 11:26

Thursday, May 22, 2003 at 11:26
HI Fellas, I think we are going to see a lot more diesels in 4x4's soon, it has to happen as fuel gets more expensive, i just dont know how you thirsty petrol users can keep it all going, i constantly get 12,L/100 out of my GU 4.2 on Highway use. 22L/100 sounds horrific to me, whats it like in a bit of climbing or rough stuff.
FollowupID: 13336

Follow Up By: Savvas - Thursday, May 22, 2003 at 12:26

Thursday, May 22, 2003 at 12:26
Depends on how you use it Michael.

I constantly get 11L/100km out of a petrol Jackaroo 3.5 on highway use but 18-20L/100km stop/start city use. I don't know if I would get any benefit by going to diesel, as it is dearer than unleaded around my area by about 5-10%.

What sort of mileage do you get with the GU in stop/start use?

FollowupID: 13340

Follow Up By: Michael - Thursday, May 22, 2003 at 16:06

Thursday, May 22, 2003 at 16:06
Hi Savvas, Running around the scrub, fire trails, running shower etc, doesnt make much of a difference at all. I get 700 ks consistantly out of my main tank. I recently did 360 ks from Mittagong to Kanangra Wall, NSW and back, used the rest of the tank to work and back and got 635ks till the low level light came on. The caves road is windy and steep, fire trails throughout the weekend, showers etc, i think a petrol would have done a lot worse off. Its towing a ton trailer with the GU that knocks the consumption about, i think i was getting around 600ks instead of 900 from both tanks. I've never really done the sums. The Kanangra Wall weekend was without the trailer. cheers. Michael
FollowupID: 13359

Follow Up By: Member - Bill- Thursday, May 22, 2003 at 17:27

Thursday, May 22, 2003 at 17:27

I used to have a 3.5 Jack and got the same figures you quote. Also got 18-20 towing the (biggish) boat or car on trailer. I now have a 3.0Di Patrol and get similar consumption on the highway but much better around town and towing, around 14-15. Most petrols are not as good as the Jack on economy either.Regds

FollowupID: 13367

Follow Up By: gumby - Friday, May 23, 2003 at 10:10

Friday, May 23, 2003 at 10:10
Thanks for the response Dozer.
I think it did start with bad fuel. I filled up both tanks (really empty) at a single pump country SHELL. Also, it was premium grade and thinking back the price was too good to be true.
But since then I've done over 7,000kms and filled up from all major outlets between Maroochydore and Sydney with little to no difference. Using Shell Premium unleaded currently gets me an extra 50kms out of the sub tank.
By the way, I'm in Newcastle and can't find any Unichip dealers listed here, so I've E-mailed one in Sydney and am waiting.

FollowupID: 13421

Reply By: Savvas - Thursday, May 22, 2003 at 12:28

Thursday, May 22, 2003 at 12:28
I'm with dozer. You could well have bad fuel.

Have you tried running the tank close to empty and then filling up from another outlet? Also, try running a 98 rated fuel and see what happens.
AnswerID: 20763

Follow Up By: Simon - Thursday, May 22, 2003 at 12:36

Thursday, May 22, 2003 at 12:36
I think it might be fuel too. Ive noticed my cruiser varies a lot in fuel consumption, (I fuel anywhere) so Im just tryin to narrow down who sells the best fuel and I might become more loyal.
Id be interested to hear how you get on.
FollowupID: 13341

Follow Up By: gumby - Friday, May 23, 2003 at 10:16

Friday, May 23, 2003 at 10:16
Thanks Savvas, yes I've run the tanks down several times and filled up all over the place, but no difference.
High octane unleaded does perform marginally better. About 50kms out of the sub.
If it was bad fuel, how come 7,000kms later it is still the same? What damage has it done?

FollowupID: 13422

Follow Up By: Savvas - Friday, May 23, 2003 at 12:36

Friday, May 23, 2003 at 12:36
Hard to tell.

I recently had my injectors cleaned off car at about 60,000kms and got a consumption improvement of 2L/100km (from 20 down to 18). Fuel filter was changed at the same time.

Have you tried something like Wynns Spitfire Petrol Treatment or Nulon Total Fuel System Cleaner?
FollowupID: 13433

Follow Up By: gumby - Friday, May 23, 2003 at 13:29

Friday, May 23, 2003 at 13:29
Yes, I've tried Wynns Spitfire treatment, and it does about the same as the premium unleaded. Also I've just had the whole fuel system cleaned, although it was on car, not off, at 72 000kms. This did result in an improvement just like yours, however by 75000kms it went back to what it was.
FollowupID: 13443

Follow Up By: Member - Bonz (Vic) - Monday, May 26, 2003 at 18:19

Monday, May 26, 2003 at 18:19
Ya sitting down guys, I had a batch of "bad" fuel in my GU and they replaced the diesel injector pump $6500......they reckon its susceptable to crook fuel

i dint pay the $$ but wow what a cost, had me crapping myself every time i fill up.

All the bestSo many places to go!
So much work to do :0(
FollowupID: 13673

Follow Up By: Savvas - Tuesday, May 27, 2003 at 11:28

Tuesday, May 27, 2003 at 11:28

How the @#$! do they justify $6500? Do they really expect us to believe that replacing the injector pump is worth more than 10% of the vehicle's purchase price?

FollowupID: 13743

Reply By: Old Jack - Friday, May 23, 2003 at 08:14

Friday, May 23, 2003 at 08:14
while you said that the dealer looked at the engine managment, the rapid jump to high fuel consuptiom could be due to cold engine enritchment, you described what sounds like an injection engine running with en engine temperature sensor that is faulty.or a faulty exhaust O2 sensor have seen the same thing with commodore V6 engines.
quick check list for
is engine reaching normal temperature on dash?(faulty thermostat stuck open)?
is the engine temperature sensors seeing the correct temperature?(this has to be checked by a technician)
is you motor running on fuel that containes over 10% ethernol????
dont have dragging brakes?
someone hasn't sprayed the undersides of your truck with concreate to make it heavy? :)

I know some of this stuff sound very simple but going back to basic sometimes helps.

I hope someone can find a solution to you problem.

Everytime I fill my diesel up it reminds me why I didnt buy the same truck with a petrol engine, on the open raod I can get 10 lt/100 klm and at worst off road 13.5-14/100 klm loaded up. when you use 6lt/100klm less than the same truck on petrol it starts to look a whole lot cheaper to run.

good luck with you 100 series
AnswerID: 20834

Follow Up By: gumby - Friday, May 23, 2003 at 13:47

Friday, May 23, 2003 at 13:47
Thanks old Jack, you certainly sound like you know your stuff. Got a background in this or have you just been unlucky like me and had to learn the hard way.
Working through your checklist
the engine reaches normal temperature ok, according to the dash.
Didn't pull the thermostat out but felt both return hot and cold supply radiator hoses from a cold start, and return got hot quickly while supply stayed cold for several minutes before warming up (but never got as hot as the return hose). This appears fine to me.
I will definitely get the temperature and O2 sensors checked out.
I have a suspicion that bad fuel was the original cause, but that was 6 months ago and I've only filled up from leading brands since.
The brakes are fine, and haven't found any concrete.

Thanks for the great tips. Keep them coming.

FollowupID: 13445

Reply By: Member - Chris (W.A.) - Monday, May 26, 2003 at 15:38

Monday, May 26, 2003 at 15:38
Hi gumby,

At first my 80 RV was at about 18L/100kms but since all the added gear and extra weight it's gone up to about 22L/100kms. Had one injector clean in the last four years and still seems to be running ok. Don't forget to feather your accelerator either. I've noticed in the past I can ease pressure about half a centimeter or less off the pedal and still sit on the same speed.
RegardsLove the bush.
AnswerID: 21092

Sponsored Links

Popular Products (13)