Having problems with your 2002 Lexus RX 300 ?

I have a 2002 RX-300. When I start the engine and let off the ignition, the engine quits. It will do this over and over, but when I step on the gas peddle to keep the idle up for a couple of minutes, then it will run just fine. Some days it starts normally and no problem, and after running the vehicle and shut the enigne down for a short period of time, it starts up and runs normally. No Enigine light comes on. I check the air filter and it is pretty clean. I was thinking about the fuel filter,

Posted / edited by AnonymousUser on : 15-07-2019

Answers :

This is extremely common on the 3.0L Lexus/Toyota engines.

The cause is built up carbon in the throttle body and idle control valve.
The carbon reduces the amount of air allowed into the engine. When the engine is cold, it needs extra air than normal (remember chokes?), and the idle control valve allows more air in. If the system is gummed up with carbon/oil the increase is insufficient, and you end up flooding the engine and it stalls. Feathering the throttle manually adds more air as the throttle plate opens, and the engine is able to run.
Once the vehicle is warm, this added air is unnecessary and operation returns to normal.

To repair this problem, you will need to remove your air intake ducting (the rubber hoses) held on with 10mm screw clamps at each end.

From there, the right hand throttle body (as you look at it) needs to be removed by taking out the 4 12mm bolts and noting their position, saving the gasket.
To remove the throttle body you will have to disengage the linkage pawl in the center, and disconnect the two coolant hoses and air bypass hose.

Once off the vehicle, clean the throttle body inside thoroughly and scuff off any baked on crud.
On the bottom you will find the idle air control valve (the part with the coolant hoses).
You will need an impact screwdriver to break the four philips screws loose without stripping them.
Remove the IAC and gasket and inspect the flapper door for movement. If it moves alright, clean the carbon build up with carb/throttle body cleaner or similar. Allow it to soak if necessary.

Reassemble in reverse order and verify condition is remedied.

On rare occasion the idle air control valve will be some stuck internally it will need replacement, but it is usually 1 in 10 instances.

If you are not feeling up to the challenge of all that, you can just take the intake hoses off, and in the right hand throttle body, you will see an open port on the bottom. Remove the air bypass hose on the bottom and cap it, then fill this port with carb cleaner or similar and allow it to soak for 10 minutes. Let the cap off so it will drain on the ground, the repeat the procedure 2 more times.
This is not a guaranteed fix but often will help for customers that do not have the ~$150 to remove and clean the unit properly.

If you have any questions please let me know, I would be happy to clarify or elaborate in order to get a good rating!
The fuel filter is in the gas tank connected to the fuel pump. Its listed at $32.00 and is said to be replaced every 60000 miles.
\015\012On the internet at Auto Parts Warehouse 1800-913-6119 24/7
\015\012Other than that its possible the ignition switch is on its way out.
Repair Help & Product Troubleshooting for 2002 Lexus RX 300

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