I had nothing better to do, so I decided to open the throttle body. The engine has not been idling smoothly, so it was a good idea to open up the throttle body to check.
After opening it up, I found a layer of sticky carbon buildup around the idle air control (IAC) valve, the air bypass passage and the throttle. No wonder the engine was not idling smoothly. Anyway, a good clean with a toothbrush, cloth and some petrol helped remove most of the carbon.
The throttle body; throttle at the bottom, air bypass passage at the top, idle air control valve at the top right and throttle position sensor (TPS) at the bottom right.
The idle air control valve is cleaned. No more carbon on the valve.
Carbon removed from the air bypass passage.
A peek inside the air intake.
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