* Incorrect Spark Plug Gap: If the spark plug gap is incorrect (too large or too small), it can lead to incomplete combustion and detonation (knocking).
* Incorrect Spark Plug Type: Using the wrong type of spark plug can also cause knocking.
* Damaged Engine Components: The most likely scenario is that pre-existing damage was exacerbated by the misfire caused by incorrect spark plug installation or other issues. This could include:
* Rod knock: A serious problem involving connecting rod bearings.
* Piston slap: Worn pistons or cylinder walls.
* Pre-ignition/detonation: This happens when the air/fuel mixture ignites before the spark plug fires, causing a loud knock.
* Low engine oil: Lack of lubrication can cause serious damage quickly.
Do NOT continue to run the engine. Continued operation with a knocking engine will cause significant and potentially catastrophic damage.
Here's what you should do:
1. Stop driving the vehicle immediately.
2. Check your engine oil level. Low oil is a serious problem.
3. Have the vehicle towed to a qualified mechanic. They can diagnose the cause of the knocking and recommend the necessary repairs.
Resetting the computer is a relatively simple process (often involving disconnecting the battery's negative terminal for a period of time), but it's unlikely to solve the knocking problem. The priority is identifying and addressing the underlying mechanical issue before further damage occurs. Ignoring the knock could lead to a very expensive engine rebuild or replacement.
