How long does it take to break in newly replaced spark plugs?

1 Answers
VioletAnn
07/29/25 11:58pm
If the car is replaced with original spark plugs, no break-in period is required as the vehicle can automatically adapt. Below is relevant information on judging spark plug conditions based on appearance color observation: 1. If it appears reddish-brown or rusty: indicates normal spark plug condition. 2. If it shows an oil-soaked appearance: suggests incorrect spark plug gap or excessive fuel supply, with possible short circuit or open circuit in high-voltage wires. 3. If it appears smoke-blackened: indicates incorrect heat range selection for the spark plug or rich fuel mixture, possibly accompanied by oil creeping. 4. If there are deposits between the tip and electrode: when deposits are oily, it proves cylinder oil creeping unrelated to the spark plug; black deposits indicate carbon fouling causing side tracking; gray deposits result from gasoline additives coating the electrodes leading to misfires.
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