Mechanics at toyota told me its the cat converter metal contracting when cooling down. Apparently it's "normal" and a lot of different model toyotas do it as well.
Mick
AntonN wrote:I've got the exact same problem. Also hear a loud clunk sound or two after about a minute after switching off the engine. It started now after the 90000km service. Toyota mechanic tells me it might be a cam rocker, but I don't believe that because the engine is not running and this means the oil pressure is down. You can also hear a clunk sound when idling at a robot. It must be something that contracts when cooling down. Hopefully it is the exhaust or catalytic convertor, otherwise the engine is running smooth.
Steveyb wrote:AntonN wrote:I've got the exact same problem. Also hear a loud clunk sound or two after about a minute after switching off the engine. It started now after the 90000km service. Toyota mechanic tells me it might be a cam rocker, but I don't believe that because the engine is not running and this means the oil pressure is down. You can also hear a clunk sound when idling at a robot. It must be something that contracts when cooling down. Hopefully it is the exhaust or catalytic convertor, otherwise the engine is running smooth.
There is another thread on this, mine started doing it out of the blue after a service around 70k... I took it for a drive and gave it a good belting and then jumped underneath to hear it, found it was the exhaust between dump pipe and cat. It made a small crack and when I bumped the cat area it made it's usual big crack, it also does it when pulled up at lights here and there. It's been doing it for quite a while now and nothing's developed.
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