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2008 - 2012 models should have the access panel behind the glove box if the van is equipped with a filter. Not all models have a filter.
You drop the glove box down by disconnecting the support straps.
It is located on the left side of the front of the motor. Lift the hood, look at the front left side under the air intake (big black pipe connected to the filter box in the front left behind the headlight). You should see a 90 degree angled metal housing with a black hose coming off of it. Where the metal housing connects to the front of the motor block is where the thermostat is located. To access it / replace it your will need to remove air intake host and then the bolts on the metal housing. It will be messy - coolant will leak out so have some rags and a pan under the motor or drain the radiator some before pulling it off. Also - obviously make sure the motor is completely cooled down and the battery is disconnected before working on it.
right behind the battery on the right side of the engine bay. You'll see a plastic box with a large rubber hose going from that box to your intake. There are clips that you'll have to release to remove the top to access the filter which is inside that box.
I'm guessing there should be a tube or pipe that goes to the valve cover. Is the hole about a 1/2 inch in diameter? If so that's the fresh air intake for your "crankcase ventilation system". That hole should not be left open because, dirt and dust can can go directly into the engine and crankcase. There should be a tube, they are usually plastic.
Pull the intake pipe up from the front panel, then to make it easier you can loosen the jubilee clip on the air mass metre,once you have done this you can gain access to the clips on the air filter housing and change your filter.
The throttle position sensor is located between the air filter box and the intake manifold. If you aren't familiar with engines, the air filter box is usually located behind the driver's side headlight. There is a rubber tunnel that runs from the air box to the intake manifold. Between the rubber tunnel and the intake manifold you will find the throttle bolted to the intake manifold. The sensor is located on the throttle.
it's a little bit of a squeeze. better to undo the rubber intake pipe and remove it (hose clamps on each end use a flat head screwdriver or 8mm socket). there are only two clip you can undo by hand on the filter housing. the half of the housing that comes off is the side towards the engine. you have to lift it up slightly because it has tabs at the bottom that fit into the other half. usually you can slide the filter out from the gap you've created.
The engine air filter in a 2002 lexus ES300 is located in a black box behind the battery. It should have a thick air hose connecting to it which is the air intake. Open the two 10 millimeter bolts holding it together and open it and replace the filter.
From your brief desription I feel maybe the problem is located elsewhere, however to start helping with your request you could possibly purchase some intake cleaner, there are quite a few on the market that vary in cost. I have had fantastic results with (Hot Shot Power Boost) it is a tall aerosol can not too expensive and you spray it sensibly directly into to your intake manifold or down the throat of Carburated Engines whilst running on tickover.(Follow instructions fully)
Another way is to use additives in the fuel but this is time consuming and takes forever to achieve results, finally you could remove the whole intake system and clean it with solvents in a parts washer?
I feel the main reason possibly is Engine Breathing, when an engine wears the bores and piston rings allow gasses to pass into the crankcase therefore pressurising the engine slightly, this forces oil out of any weak area's and mainly from breather pipes such as into air intake.
Maybe a good engine oil flush and quality oil replacement with filter might help but in the long run you'll have to live with it.
If when warm you take the pipe from the engine to the Air filter off does is blow blueish vapour? if it does then you could filter it away from the intake to save clogging.
Hope this FixYa's problem?