I have a 2000 Lexus ES300 w/ 194k miles and I just replaced the 2 air in take hoses that connect straight into the throttle body since they were cracking pretty bad. While I had the hoses out, I cleaned the throttle body entrance, spray seafoam through the idle air control valve with the bottom hose of the valve disconnected so the seafoam can flush the carbon out, and suck the seafoam through the brake booster vacuum line into the throttle body. After that everything is fine, the engine feels more responsive after I cleaned the throttle body. However, I noticed the engine make noises similar to knocking/tapping whenever it is idling. It takes a few minutes after starting the engine for the noise to come on and some seconds when the car is stopped on the road for it to come on. I don't hear it when I give it some gas or driving 80mph on the highway. Is this because I cleaned the throttle bottle and knocked some debris loose or is it something more serious? Other than the noise, which I barely hear while inside the car, I don't feel any performance degradation.
Video link: The noise is around 3:33 mark https://www.youtube.com/watch?v=vOv9S39cTNU
It kind of sounds like it might be a bearing noise, remove the fan belts and if the noise goes away then figure out which one of those pulleys is making that noise. If it still makes the noise then it's inside the engine and Id pretty much live with that as long as it runs okay because Tara knows engines down is expensive
I found the culprit. I removed the beauty cover and one of the small hoses underneath it broke off. I think it's because while installing the intake hoses, I accidentally pulled or hit on that hose and since it broke off underneath the engine cover, it tells me that hose is very brittle from being under there 23 years of the car life. I put electrical tape on it as a temporary fix until I find a replacement.
Thanks for the inputs! Love the content!