Question about 2000 Lexus RX 300

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My 2000 rx300 is not holding its idle rpm when i try and start it. It runs though if I hold the gas pedal. what do I need to check or what do I need to replace to fix this problem?

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I have a 2001 RX300 and I had this EXACT problem just a year ago. I recommend cleaning your idle air control valve. It does not need replaced. If you take it to a dealership, they want to replace it for $400.00. Just clean it, trust me it works. I cleaned mine with throttle body cleaner and I have not had the problem since. I did this at 80,000 miles and I now have 120,000 miles on it. Go to lexusownersclub.com to see more info about this condition. I used this site to get the steps on how to access the idle air control valve (it's underneath the right side of the throttle boddy). Clean it with Q-tips and throttle body cleaner - this is what worked for me. The I.A.C.V. is a round mechanism that needs to turn within it's housing - when it gets dirty then it doesn't turn and this causes a rough idle or it causes the car to stall. The I.A.C.V. gets dirty because of the recirculation of smog (for emission controls).

Posted on Jul 21, 2009

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Try having these 3 things checked for a start:
throttle position sensor
idle air control valve
fuel bypass valve

Posted on Jul 14, 2009

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