Hello, this is Tanno.

This time the car came in because the idling was high.

The car is a BCNR33.

After some investigation,

we determined that the coating on the throttle chamber was peeling off.

When we removed it, we found that the coating had indeed peeled off.

When the coating peeled off, the intake volume increased by the amount that was peeled off, which exceeded the adjustment range of the AAC valve and caused the idling to rise.

While replacing the chamber, we also replaced the air regulator and hoses at the back.

After replacing the chamber, the idling went down and became better.