What happens if the wrong spark plug model is used?
2 Answers
Using an incorrect 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 each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for any external debris like leaves or dust 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 according to the firing order, and then 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 operation of the vehicle. Severe spark plug erosion, blistering at the top, breakage, or melted and eroded electrodes all indicate that the spark plug is damaged and should be replaced.
As a veteran truck driver with over 20 years of experience, I've personally witnessed the troubles caused by using wrong spark plug models. Last week when helping my young neighbor check his shaky old Jetta, I found racing spark plugs with extended threads installed – completely mismatched in heat range. The idle was gasping for breath, throttle response felt weak even at full pedal, and fuel consumption soared to 11L/100km. What's worse, this damages the engine – incomplete combustion left thick carbon deposits on piston crowns, and the exhaust pipe became scalding hot. If he doesn't switch back to the factory-specified NGK platinum plugs soon, it might clog the catalytic converter. Car repairs shouldn't be half-hearted; always use the exact model specified in the manual.
