What are the reasons for occasional shaking at idle speed?

2 Answers
ODante
07/29/25 8:41am
Here are the reasons for occasional shaking at idle speed: Influencing factors: The influencing factors for shaking at idle speed include: spark plug or ignition coil failure; incorrect valve timing; uneven cylinder compression; poor valve sealing, air leakage; poor fuel pressure; clogged fuel injector; leakage between the cooling system and cylinder; air flow sensor failure. Direct cause: The main reason for shaking at idle speed is the contamination, wear, or incorrect installation of mechanical components, leading to changes in the power of individual cylinders, resulting in an imbalance in the power of each cylinder, causing unstable engine idle.
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OEmersyn
08/11/25 6:16pm
My old car occasionally shudders a few times when waiting at a red light, feeling just like a person shivering. At first, I thought it was due to cold weather or the engine not being warmed up enough, but later I realized it wasn't a minor issue. After checking at the repair shop, it turned out to be an ignition problem caused by aging spark plugs, and there was also a significant buildup of carbon deposits. The technician suggested driving more on highways to help clean the carbon deposits and regularly replacing spark plugs to prevent similar shaking. I've also heard that ignition coil failure or vacuum tube leaks can cause similar symptoms. Addressing these issues early can avoid bigger troubles and save on more repair costs. Remember, don't wait until the shaking becomes frequent to take action.
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