I've never seen this topic addressed here and frankly I was ignorant to the issue until I was watching "the car care nut" on YouTube regarding the necessity of this on Toyota vehicles ideally every 30-50k miles. I did do a search on this forum and see it in the other year(s) Gen(s) forums, but not here. Is the 2012-2015 Pilot immune(ha ha) to this issue?
bdozer1965
Joined
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102 Posts
I've cleaned a bunch of them. Typically smoothes out the idle and improves throttle response on high mileage vehicles.
I did this on my gen 2 about 2 years ago, it was fairly dirty. They get dirty because the EGR valve circles exhaust gases back into the intake tract and the throttle body butterfly gets crusted with carbon. Why this is an issue is that at idle, the butterfly valve has a precise gap around it to allow the right amount of airflow into the intake. The carbon build-up clogs that minuscule airway. Cleaning it away allows your vehicle to breathe correctly at idle again. This is a fairly easy job, the hardest part is just taking apart the intake tract and getting access to the throttle body. This is a decent walkthrough for it.
I did this on my gen 2 about 2 years ago, it was fairly dirty. They get dirty because the EGR valve circles exhaust gases back into the intake tract and the throttle body butterfly gets crusted with carbon. Why this is an issue is that at idle, the butterfly valve has a precise gap around it to allow the right amount of airflow into the intake. The carbon build-up clogs that minuscule airway. Cleaning it away allows your vehicle to breathe correctly at idle again. This is a fairly easy job, the hardest part is just taking apart the intake tract and getting access to the throttle body. This is a decent walkthrough for it.
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