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The Engine Control Unit (ECU) in a 1996 Toyota RAV4 is not reprogrammable, but can be replaced with a new or remanufactured unit. However, if your RAV4's fuel consumption is high, it is likely due to other issues, such as a dirty air filter, a faulty oxygen sensor, a clogged fuel injector, or a worn spark plug. You should have the vehicle inspected by a qualified mechanic to determine the cause of the high fuel consumption.
check for codes and data readings. check O2 sensor readings, is the thermostat tired and not working properly, this can cause high fuel consumption. take a close look at who and how the car is being driven.
fuel consumption of a vehicle is a hard question to answer as there are many variables all of which affect fuel consumption
run the fault codes to check electronics. check cat converter for failure and blocking the exhaust. talk with a service dealer centre and find out what the manufacturer recommended as an economy for the vehicle.
check the injectors as the tips may need attention.
check the turbo variable vanes are operational.
1 Blocked fuel filter = fit new filter and bleed fuel lines
2 Air in fuel lines = check fuel lines for cracks, repair and bleed fuel lines
3 No fuel = fuel car, bleed fuel lines
There are a few websites that have the official fuel consumption information for a new vehicle. Just google "1998 toyota spacio specs" and you can look it up.
The consumption you will achieve on one of these cars (now 12 years old with lots of miles driven) depends upon: 1. how they are driven; and 2. how they are mechanically maintained; and 3. running sufficiently high tyre pressures to minimise rolling resistance; and 4. the octane rating of fuel used and whether or not it is an ethanol blended fuel.(You will need to consume more fuel for the same distance traveled if using an ethanol blended versus a straight non-ethanol fuel).
A poorly maintained vehicle will usually give poor fuel economy as will one that is driven hard.
Did you take it apart. That is my definition of cleaning. Is the float sinking and allowing too much fuel to enter from the fuel bowl. I hope it's not fuel injected because, I only know what you tell me. Most vehicles from 84 on have no carb.
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