There should be a fuel shutoff that needs to be adjusted, but let the car idle a couple of minutes before shutting it off and the valves should cool off enough to not diesel.
There are many possibilities. More information is needed. If it's a 70's era car that's dieseling, could be the timing is off, or the anti-dieseling solenoid isn't working. If the car has had an electric fan installed recently, and won't shut off when the fan is running, the fan is not properly wired. If it's a computer controlled car, could be a problem with the ignition switch or ecm.
the solution can depend on the year and induction type. usually too high an idle speed and rich idle mixture combine to allow a hot carbon chunk in the cylinder to ignite the mix and cause the dieseling. on injected engine its far less common but leaky injectors have been known to cause the condition also
Dieseling or "Run-on" occurs when the engine is so hot that the fuel in the engine ignites without the spark plugs firing. On newer cars, like this '92 Honda, there should be an anti-dieseling valve that will turn off the fuel. That might have failed and will need to be replaced. After your engine has cooled, check the coolant level. If the coolant is too low, it can contribute to the engine overheating. If the radiator fan is not running while your car is dieseling you can bank on problems with the cooling system. The '92 accord, I believe, still has a thermostat switch that turns the electric radiator fan on. That could be bad or the fan could be burned out.
If you mean that the engine continues to sort of run after the ignition is switched off, this is called "dieseling." It's not a good thing, and there are several potential causes. You'd probably need to take it to a mechanic to have it diagnosed and repaired. (If you didn't already know this, it's probably not something you can diagnose and fix yourself.)
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