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Is there any temperature sensor that would give us a rough idea of the intake valve temp? I would like to see if I am achieving a high enough temperature to prevent / burn off carbon deposits. Ideally need to bring it up above 320 deg C to achieve this right?

With an OBD scanner, I can see three intake sensors, but i don't think they are deep enough in the intake. The highest of the three only gets to about 60deg max.

Do any of the exhaust sensors give an indication?
 

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There are no carbon deposits, unless you have a diesel. And no, theres no way short of pulling the intake manifold off and hitting it with a laser. Just run it to red line a few times on a nice deserted highway.
 
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