If the engine of a 1994 Olds Achieva sounds like it is still running after you turn it off, it could be due to a phenomenon known as "dieseling" or "run-on." This occurs when the engine continues to run due to residual heat igniting the fuel in the combustion chamber, often caused by a dirty carburetor or improper fuel mixture. Another possibility is an electrical issue, such as a faulty ignition switch or a problem with the engine's electrical system that keeps the engine running momentarily. Checking the fuel system and ignition components can help diagnose the issue.
does it sound more like a knocking sound from the engine at idle?
Because it's in park.
If the engine is running it is using fuel.
Depends. An older Diesel is likely to keep running. A modern, with a full set of electronic engine diagnostic might not.
It sounds as if it's running because once it's turned on and ran it starts to heat up. Once you turn off the engine it makes the sound of it running because it is still trying to cool down; hense, it's the fan motor that's making that sound, not the actual heater. FYI, I'm a mother of 2 and an attorney. I found this out about the fan thing AFTER it happened to me and I asked a mechanic. He acted like I was an idiot.
Yes it will, engine coolant still flows through it when engine is running.
??? i have a work truck that is 600,000 plus and still running ???
I have 250,000 and still running.
I believe you are "standing", not parked.
Check radiator fluid when engine is still cold but running add if needed and fill resevoir. Never open a radaitor cap on a hot engine only qualified mechanics should ever attempt this.
yes. you are still moving in a direction, and the wheels are still spinning, and the engine is still running, and the transmission is still being used.
I've seen this happen in Honda's. Does it remain running for long periods of time or never shut off? If it is only running for a short time, it's cooling off your engine still because it's still really hot. There's nothing wrong with this.