Hey Every one,
I have a "96" 75 series 1FZ-FE, 200,000klm on the clock and running a duel fuel EMER vapor injected gas. Located south east
Melbourne.
I am trying to fix the excess fuel consumption problem,
fuel consumption is almost even LPG to Petrol and is under powered guessing 20/30%.
Just wondering if any one out there has any geeky info on re-calibrating a MAF (Alloy type) on a 1fz-fe engine that does not run a O2 sensor.
Does the MAF meter uses a thermistor to adjust the fuel ratio? and also does the flap spring tension have anything to do with fuel mixture.
If i replace the MAF meter with a new one and it does not fix the problem I will waste $1300.
I'm guessing the previous owner has tried to fix the fuel issue/surge/ sensor issue and put many of hours and $$$$$ into it.
It has reco injectors, new fuel pump, filters, leads, Plugs, cap, rotor button and the intake manifold has fresh gaskets and Vac hoses, strong spark, Good compression, 6th cyl is a fraction low but still gets up there.
I just found it had a Toyota Camary MAF meter fitted (25lts per 100klm on h/way running smooth on gas but extreamly surging on petrol from 2/5 to 4/5 throttle with little low down torque)
I have replaced it with a second hand 80 series 1FZ-FE MAF meter (new one is $1300) after calling Toyota to cross ref the MAF meter part number and it suits this model plus other 1FZ-FE models, (35-40lts per 100klm on h/way, throttle is very smooth on both fuels now, better low down torque) but still a at a guess 20-30% under powered until 4000 RPM.
I am looking at setting the vehicle on a dyno and opening the D shaped cap to adjust the air flap spring tension and to see if we can re-calibrating the air temp sensor with a resistor or a potentiometer. I am guessing the small plastic stem in the intake side of the MAF meter is a thermistor??
I'm not sure if this is possible but after opening the Camary MAF meter, it may be.
I have read the "Land Cruiser 105 fuel issue" thread
Has anyone had any operation similar to what I am looking at performing?
If so, detailed info would be greatly apreciated,
May the forest be with you!