1FZ-FE Fuel Economy (4 Viewers)

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.

Brendon85 said:
Engine has had complete rebuild 15,000km ago. Fuel consumption was 24L/100km (10MPG) Replaced injectors and fuel consumption is now 38L/100km (6.2MPG) Ignition system is new and fuel system is new.
Click to expand...

Trouble shooting 101

When you have a new problem after works been done, go back and recheck everything that's been done.
Be suspicious of everything new

1st in your list is engine rebuild.
24L/100km is too much for a fresh engine.
Even if you make the assumption a fresh engine is gonna be tight and use more fuel until it's run in, I wouldn't expect it to use 30% more than what's typical. And by 1500km, it should be running free and easy.

What was your run in procedure?

Had anyone verified the critical mechanical stuff is correct?
See my list above?

Why new injectors?
Were the originals flow tested? Inspected?
How many km in the original injectors?

I've made inquiry's about having injectors cleaned at 250k km, and feedback from more than one supplier has been not to mess with them. Toyota injectiors rarely need cleaning.


Be specific about what's new in the ignition system and fuel system?

New doesn't always mean good. Aftermarket parts can be problematic. OEM Toyota parts can be no good fresh out of the box (not common, not unheard of)

There's loads of people on this forum w with more knowledge than me
The more detailed info you share, the more likely someone is to be able to help.
 
mudgudgeon said:
Trouble shooting 101

When you have a new problem after works been done, go back and recheck everything that's been done.
Be suspicious of everything new

1st in your list is engine rebuild.
24L/100km is too much for a fresh engine.
Even if you make the assumption a fresh engine is gonna be tight and use more fuel until it's run in, I wouldn't expect it to use 30% more than what's typical. And by 1500km, it should be running free and easy.

What was your run in procedure?

Had anyone verified the critical mechanical stuff is correct?
See my list above?

Why new injectors?
Were the originals flow tested? Inspected?
How many km in the original injectors?

I've made inquiry's about having injectors cleaned at 250k km, and feedback from more than one supplier has been not to mess with them. Toyota injectiors rarely need cleaning.


Be specific about what's new in the ignition system and fuel system?

New doesn't always mean good. Aftermarket parts can be problematic. OEM Toyota parts can be no good fresh out of the box (not common, not unheard of)

There's loads of people on this forum w with more knowledge than me
The more detailed info you share, the more likely someone is to be able to help.
Click to expand...
The car was using 24L/100km before the rebuild and any accessories were added. The bores were well worn out as the mechanics showed me when it was rebuilt.

Ran the engine in using mineral oil and varying speed with breaks inbetween to let the car rest and completely cool down. Oil dropped 5000km later after the rebuild and 10W40 Penrite used. Fuel system cleaner used every service and engine flush also used.

Original injectors were not flow tested and I asked them to be replaced with OEM. I needed the car back on a deadline. Live in Alice Springs and I am currently in Adelaide. Good mechanics are hard to find right? Adelaide has an abundance of choices. Original injectors had 380,000km.
 
mudgudgeon said:
Trouble shooting 101

When you have a new problem after works been done, go back and recheck everything that's been done.
Be suspicious of everything new

1st in your list is engine rebuild.
24L/100km is too much for a fresh engine.
Even if you make the assumption a fresh engine is gonna be tight and use more fuel until it's run in, I wouldn't expect it to use 30% more than what's typical. And by 1500km, it should be running free and easy.

What was your run in procedure?

Had anyone verified the critical mechanical stuff is correct?
See my list above?

Why new injectors?
Were the originals flow tested? Inspected?
How many km in the original injectors?

I've made inquiry's about having injectors cleaned at 250k km, and feedback from more than one supplier has been not to mess with them. Toyota injectiors rarely need cleaning.


Be specific about what's new in the ignition system and fuel system?

New doesn't always mean good. Aftermarket parts can be problematic. OEM Toyota parts can be no good fresh out of the box (not common, not unheard of)

There's loads of people on this forum w with more knowledge than me
The more detailed info you share, the more likely someone is to be able to help.
Click to expand...
Using new NGK spark plugs as what NGK recommends, Goss coil packs (still have the OEM) and Bosch sports leads. The whole ignition system is replaced.

New injectors Icon (INJ-136M) and Denso fuel pumps (OEM fuel pumps).
 
There were two faults listed. O2 temp sensor was a high voltage fault. Short term and long term fuel trim is at -100% which from what I had researched is as rich as possible. The scan tool lists no faults after the mechanic went over it and reported no faults.

20230102_160039.jpg
 
mudgudgeon said:
I think the FSM will give testing parameters for individual sensors.

I think you can have faulty sensors that impact the EFI without them showing on a scan tool.
Click to expand...
Sounds good to me. I am hoping they can sort whatever the issue is. Being I have already purchased the ECU and wideband O2, they can still fit that on and tune it for me. I am hoping it comes back with a good result. So far I have replaced two sensors being the MAP and the O2 temp sensor.
 
Car was tuned today however has not been released back to me because it needs to have its cold start finished. Initial dyno run showed 40kw at the wheels. Final is now 75kw at the wheels. No fuel figures yet but I will work that out soon after I get the car back.
 
mudgudgeon said:
I think those numbers are low.

But given mileage, may be to be expected
Click to expand...
I will see how it drives and share the dyno graph if I am given a copy. Pick the car up in roughly 18 hours after a cold start tune. Does anyone know what KW/HP an 80-100 series is getting at the wheels standard?
 
Brendon85 said:
I will see how it drives and share the dyno graph if I am given a copy. Pick the car up in roughly 18 hours after a cold start tune. Does anyone know what KW/HP an 80-100 series is getting at the wheels standard?
Click to expand...
Most that I have seen should be in the 100kw to the wheel range.
 
Before and after on the dyno. Claim from the tuner is they do not make much power at the wheels without forced induction.
20230212_140235.jpg
 
That is less than normal, I have dyno'd at least 6 1FZFE cruisers and seen countless others on the dyno they are always between 125-140awhp, 93-105kw. I guess this dyno could be a super heart breaker but it seems like something is off. How does it drive? How does it compare to before the new computer?
 
scottryana said:
That is less than normal, I have dyno'd at least 6 1FZFE cruisers and seen countless others on the dyno they are always between 125-140awhp, 93-105kw. I guess this dyno could be a super heart breaker but it seems like something is off. How does it drive? How does it compare to before the new computer?
Click to expand...
Car drives smoother than before. Might be something in the driveline?
 
Turns out there is a 15-18% discrepancy between some dynos. That coupled with a 40% drivetrain loss near accounts for the results. The landcruiser does drive better since the tune. The tuner also forgot to turn my AC on in the middle of summer. Will be returning tomorrow to get that switched back on.
 
Brendon85 said:
Turns out there is a 15-18% discrepancy between some dynos. That coupled with a 40% drivetrain loss near accounts for the results. The landcruiser does drive better since the tune. The tuner also forgot to turn my AC on in the middle of summer. Will be returning tomorrow to get that switched back on.
Click to expand...
Fuel consumption is exactly the same. 24L/100km post installing and tuning the ECU with wideband O2.
 
12-13mpg on 37” bfgs..4:10 gears 10% under drive in t case…loaded for bear always
Best I saw was 17mpg on 33” tires
 
You must log in or register to reply here.

Similar threads

AustinKordell
1fz-fe fuel line size.
Replies
0
Views
240
AustinKordell
AustinKordell
O
1FZ-FE Technicians in S or SW Florida.
Replies
4
Views
480
Broski
Broski
norosmith
1FZ-FE idling rough and stalling
Replies
2
Views
359
norosmith
norosmith
Matty c
1fz-fe & transmission
Replies
2
Views
1K
Fj80oregon
Fj80oregon

Users who are viewing this thread

Total: 5 (members: 0, guests: 5)

Share this page

Back
Top Bottom