Mazda 5 water intrusion in spark plug compartment requiring repeated replacement of spark plug cover and components on Mazda 5

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Mazda 5 owners report experiencing issues related to water intrusion in the spark plug compartment, which necessitates frequent replacement of the spark plug cover and components. This problem can lead to misfires and decreased vehicle performance due to water in the spark plug well. Additionally, water entering the spark plug hole poses a significant risk of engine damage, including hydrolock, which may result in bent connecting rods and catastrophic engine failure. Weak ignition components, such as faulty ignition coils or spark plug wires, can exacerbate these issues by preventing a strong spark, leading to wet spark plugs and starting difficulties. Furthermore, water in the spark plug compartment can short out electrical impulses, causing a "crank no start" situation, while wet spark plugs can ground out the spark, negatively impacting fuel ignition and overall engine performance. If a spark plug fails due to water intrusion, owners may experience poor drivability, difficulty starting the engine, increased fuel consumption, and sluggish acceleration. To effectively address these concerns, it is essential for owners to identify and resolve the root causes of water intrusion, including inspecting for leaks and ensuring proper sealing of the spark plug compartment. Regular maintenance and thorough drying of excess water can also help mitigate these risks.

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