Question about Cars & Trucks
Posted by Anonymous on
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Posted on Jan 02, 2017
The Idle Air Control (IAC) valve is clogged. This part feeds air to the engine at start-up and idle when the throttle bodies are closed. I removed the throttle body assembly from my 2001 RX300 and separated it from the IAC. After a good cleaning with throttle body cleaner the IAC was good as new. I later decided to replace it during routine maintenance. You can pick up a brand new IAC on eBay (genuine Lexus/Toyota part). The dealer will want upwards of $400.00 for a 45 minute job (all you need are basis hand tools).
Posted on Mar 23, 2009
Check and clean Idle air control valve. Make sure its responding to signal as well. Also make sure ther are no vacuum hoses disconnected. This may not be a "cure" but it's a good place to start.
Posted on Apr 14, 2009
so many possibilities...
does it roll fairly freely? (checking to see if the brakes or rearend seized up)
Are there any "bad" sounds like things grinding? (Connection between Motor and rearend, axle splines...)
If all that is solid, it is likely in the controller.... (it takes a solid charge right... No bad batteries in there or loose connection? might want to check all the battery connections to make sure none are burnt...)
1997.. does it have the electonic speed control by that year? the other possibilty is that the accelerator is not working corectly. they used a resistor system on old ones that has contactors that would get worn out.... Newer ones control a potentiometer(sp) that controlled the speed.
Only a few real components to check, but if you are not mechanically and electically inclined, could be tough to isolate.
Posted on Mar 07, 2010
Have the idle bypass valve checked, also called idle air control valve.
If that valve is stuck in the closed position, it's not allowing the fuel to bypass the throttle plate to keep it idling, resulting in stalling, but will keep engine running if the pedal is pushed down.
Posted on May 14, 2010
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