Why does the Sportage engine shake when the air conditioning is turned on?
2 Answers
The Sportage engine shakes when the air conditioning is turned on because the operation of the air conditioning compressor increases the engine load, causing the engine speed to drop and resulting in body vibration. Idle speed boost device: Most vehicles are equipped with an engine air conditioning idle speed boost device. When the air conditioning compressor is operating, the air conditioning system simultaneously sends a command to increase the engine speed to the required range, solving the issue of engine shaking when the air conditioning is turned on. Main faults: Engine surging accompanied by shaking is a common and challenging automotive issue. The primary reason is excessive tire inflation. Properly increasing tire inflation pressure can reduce rolling resistance and save fuel when tire inflation is appropriate.
My Sportage also experienced engine shaking when the AC was turned on. I think the most common reason is the wear and looseness of the engine mounts, which are originally designed to buffer vibrations. Over time, the rubber deteriorates and fails. Additionally, when the AC is turned on, the compressor starts suddenly, increasing the engine load. If the vehicle's ignition system has issues, such as spark plugs that haven't been replaced for too many years or severe carbon buildup, it can easily lead to uneven cylinder operation and shaking. Problems in the fuel system, like clogged fuel injectors, may also cause insufficient fuel supply and worsen the issue. I remember once I ignored the shaking, and it resulted in a sharp increase in fuel consumption and nearly stalling the engine. Later, I went to the repair shop, cleaned the throttle body, and replaced the new engine mounts, which solved the problem. I suggest everyone check and fix these issues early to prevent small problems from becoming big ones and affecting the engine's lifespan.
