The Big Fuel Consumption.

[fonserg]

Hello from Russia! I became the owner lexus is 220d (the engine toyota 2AD-FHV 2231cc-177hp). The engine consumes a lot of fuel. Speed 100 km/h on cruise control average fuel consumption = 6,5 liters (~ 40 mpg). Sometimes the expense becomes 4,6 liters (~60 mpg). I move on the same road, in identical conditions. Diagnostics doesn't find problems with my engine. I have cleaned FAP the filter and have established emulator instead of it. Has closed fuel access to the fifth injector. Has completely blocked EGR (I submit 100 % pure air from turbo). In what there can be a problem? At a forum lexus to me can't help, probably you had such problems? In advance excuse for my bad English I use online the translator of the text.

[fonserg]

To instructions to the engine it is written if ECU one of following parameters that isn't poisoned there is an additional expenditure of fuel in cylinders and the fifth injector

parameters:

1) Temperature of a cooling water - good in my car

2) temperature Gauges nearby FAP - need test

3) MAF - i use new

4) the FAP gage of a difference of pressure - i use emulator

5) oxygen sensor - need test

Who does that think of my problem?

[OldSkoO1]

I had this engine for 3 years. I never found a way to improve fuel consumption. I tried many methods. None worked.

My driving style did help me achieve better consumption than most here. However, this engine did not seem to improve if driven on the motorway unlike my other cars. I achieved 42.6mpg lifetime average for this car. Official figure was 45mpg.

I expected nearly 50mpg on motorway, my bmw 335d even manages this but toyota engine did about 44 max combined. With 47 on one exception.

I'm sorry to say there is nothing you can do. 40 mpg is a typical average for a car of your saloon size and weight.

I think it is down to injector timings and the amount of fuel injected into cylinder, too much, possibly because of the following. I wonder if car isn't as efficient with energy waste and heat. Big proportion of air mix is nox. Burns cooler than air and cannot extract as much calorific energy per unit from fuel requiring more fuel to create the power thus creating more soot. Vicious circle begins again. Worse in winter as winter diesel contains anti gelling agent for cold temps reducing the calorific rating even further. Leading to white smoking cars in the winter.