Hello every body
I have discovered that my lexus es300/2002 fuel consumption rate is higher than the normal where the AVG is 29.4L /100 km , my Q is what is the reason of that?
Thanks

 

Hello,

It is quite a bit more than it should be. According to government fuel consumption resource, it should be around 21mpg (11.2L / 100km).

Any Check Engine lights?
What is your driving style? If you are racing the car on regular basics, you will get poor fuel economy.

There can be a lot of reasons for the increased consumption, from dragging brakes to a hole in a tank, not to say that it can be caused by multiple problems. To diagnose it, you will most likely need a scanner that can read engine's live data.

From easy stuff, check your tire pressure, brakes, air filter and spark plugs. If the air filter is dirty, odds are that your MAF sensor is also gunked up. If that's so, clean or replace the filter, and use a designated cleaner to clean your MAF sensor. Also, when was the last time spark plugs were replaced? They should be relatively clean, and the gap should be 1.1mm.

Check how long it takes for the car to warm up, in summer, it shouldn't take more than 5-10 minutes to fully warm up at idle. If it does take longer, carefully touch upper and lower radiator hoses - you should feel a distinct difference in temperature; your radiator should also be cold before the car reaches the operating temperature. If that's not the case, replace the thermostat. While you are in there, you can also check the resistance of a coolant temperature sensor.

For next checks, you will need a scan tool. Some sensors (like A/F sensor) can get sluggish and unresponsive over time, while still being in boundaries to not trigger a CEL. Also, check your fuel trims, if the mixture will be too lean, check MAF and A/F sensors, fuel pressure, and also check for vacuum leaks. If the mixture is too rich, check injectors, fuel pressure, or thermostat. To check where do you have a vacuum leak, carefully spray around all the vacuum hoses and intake with something like a starter fluid or brake cleaner, see if the engine's behavior would change, or A/F sensor readings would spike. If so, it will indicate a vacuum leak.

Hope this helps and best of luck!

 

If Engine Air Intake Throttle Hose is damaged, would IT couse more fuel consumption?

Thanks

 

Not sure, but regardless it needs to be replaced since it's allowing unfiltered air in the engine. Also, it's hard to tell but it appears the vacuum line on the tee (near the air filter housing) maybe disconnected.

 

Can't say I can see a whole lot there, but ANY loose or damaged hose that comes to the intake after the MAF sensor will result in an unaccounted air in the combustion chamber, which will drastically drop your fuel economy. Things like that need to be addressed as quickly as possible. You can temporarily tape it up and see if it will get any better, however, I would still suggest replacing it.

Hope this helps and best of luck!

 

Excessive fuel will ruin the catalytic converters ($$$$$) fix that ASAP and drive as little as possible until fixed.

 

Separately, how are you determining/calculating fuel consumption?