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NotMyRX300

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  • Lexus Model
    RX300

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  1. Good writeup! Made me clean mine out instead of buying a replacement part. Dealership had replaced one IAC under warranty. Less than 40k miles later, the hard starts were back! Seems like it needs to be a regular service every 30-40k miles. :( Apparently the air assist hose that feeds the IAC brings a lot of pollution with it. Since I had the shop manual, I followed it's instructions. I thought about following yours, but the adjustment of the throttle bodies was just another variable I didn't want to deal with. Removing the complete dual throttle body setup is actually not that difficult. Here are my highlights (assumes you are following service manual steps): Didn't drain the coolant, you will only lose a little when disconnecting the two lines. Service manual didn't mention removing cruise control cable, but you need to. I didn't disconnect the PCV hose, I removed the air cleaner hose with PCV hose attached and let it sit on top of the engine cover. The throttle body mounting bolt is tricky to feel -- but it is directly below the big brass seal. I removed the 2 coolant lines after removing the 3 mounting nuts. You can swing the assembly off the mounting studs, and angle it towards you for better access to the hose clamps. You will need a long socket extension to access 2 / 3 of the mounting nuts. I passed my socket/extension underneath the throttle bodies to remove the bottom most nut.
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