When a coil fails in a DIS, what might the engine experience?

When a coil fails in a Distributorless Ignition System (DIS), the most common outcome is that the engine will experience rough running and power loss. This occurs because a failed ignition coil can lead to a weak or inconsistent spark, which directly affects the combustion process.

In a DIS setup, each cylinder is typically fired by its own coil. If one coil fails, the affected cylinder will not receive the proper spark to ignite the air-fuel mixture, resulting in misfires. This can lead to a rough idle and noticeable power loss during acceleration, as the engine becomes unable to perform efficiently with one of its cylinders not firing correctly.

While the other options highlight potential issues that might arise in different scenarios, they do not specifically correlate with the failure of a coil in a DIS. For example, not starting could occur due to several system failures, overheating does not directly result from a coil failure, and excessive fuel consumption often relates to other factors, such as fuel delivery or sensor issues, rather than an ignition coil malfunction.