Hi….I have a Toyota Dyna.. It run well but when the temperature gauge rises to the half, it starts running like if it has a diesel knock… What could be the problem.
What year and engine does your Dyna have? Depending upon the year and model it may actually have a diesel engine in it.
Lets suppose your vehicle is a newer petrol engine. When the engine is cold it uses preset parameter to operate the engines timing and fuel system. Once the engine warms it looks to the engines sensors to operate optimally. Engine knock could occur do to one or more of these sensors failing. For example the knock sensor or engine temperature senor.
The best first course of action in any case would be to have the computer codes read. post them below if you have already gotten the codes.