What are the effects of incorrect spark plug models?
2 Answers
Choosing the wrong spark plug model that does not match the engine will inevitably cause knocking and overheating, leading to unstable engine speed or weak driving performance. Steps for replacing spark plugs: Open the hood, lift the plastic cover of the engine, remove the high-voltage distributor wires, and mark the position of each cylinder to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for any leaves, dust, or other debris on the exterior and ensure they are thoroughly cleaned. Place the new spark plug into the spark plug hole, hand-tighten it a few turns, and then use the socket to tighten it further. Reinstall the removed high-voltage distributor wires in the firing order and secure the cover. If the spark plug is damaged, it can directly cause issues such as leakage in the vehicle's ignition system, increased fuel consumption, reduced power, and most importantly, difficulty in ignition, affecting the normal use of the vehicle. Severe spark plug erosion—such as scarring at the top, damage, or electrode melting and erosion—indicates that the spark plug is already damaged and should be replaced.
Speaking of using the wrong spark plug model, I have to share my personal experience. Once, I opted for a cheaper non-OEM replacement, and as a result, the engine kept shaking constantly while driving, feeling underpowered with sluggish acceleration. Later, I discovered the model was incorrect—its heat range didn’t match, causing ignition delays. The spark plug gap was either too large or too small, leading to unstable voltage output, incomplete fuel combustion, and a 10% spike in fuel consumption. Worse, the engine started making squeaking noises, the spark plugs quickly fouled, and even the ignition coils got damaged. To fix it, I had to redo the job, wasting a lot of money. Now, during maintenance, I strictly follow the manual to select the correct model to avoid unnecessary hassle. Simply put, using the wrong model not only affects driving smoothness but can also shorten component lifespan—it’s best to correct it early.
