What happens if you press the brake and rev the engine in an automatic transmission car?
3 Answers
Car won't move, and this can cause significant damage to both the engine and transmission, accelerating vehicle wear. Below is relevant information about the car throttle: 1. Function of car throttle: In gasoline engines, the throttle doesn't control fuel injection volume but rather regulates the throttle valve opening size. A smaller opening means less air-fuel mixture enters the cylinders, resulting in lower engine power output, and vice versa. 2. Solutions for stiff throttle: A stiff throttle can be addressed by cleaning the fuel system. Alternatively, try continuing acceleration to see if engine RPM increases without corresponding speed gain - if so, it might indicate a damaged sensor in the transmission locking the overdrive gear.
I did the same thing when I first started driving. Once, I accidentally held the brake at a red light while revving the engine. The whole car roared wildly, shaking like an earthquake, with black smoke pouring from the exhaust pipe, scaring the car behind me. The mechanic said this would cause the transmission fluid temperature to skyrocket, the torque converter to lock up and slip, and possibly burn out the clutch plates. It's even worse for turbocharged cars—the turbo speed can instantly exceed 10,000 RPM, easily deforming the blades. Thinking about it now still scares me; it was like roasting the transmission over a fire. I advise new drivers to control their right foot and wait until the gear is in 'D' before stepping on the gas, to avoid costly repairs.
Having driven a taxi for twenty years, I've seen too many drivers pressing both the brake and accelerator at red lights. Let me tell you, the sound alone is painful to hear—the exhaust pipe sputters, the dashboard's coolant warning light flashes wildly. In the short term, the engine revs high and idles pointlessly, causing the torque converter fluid to carbonize rapidly. If it goes on a bit longer, the transmission's computer will enter protection mode and lock the gears directly, leaving the car stranded on the road and requiring a tow truck. Once, I had a passenger in this situation who thought the car was about to explode and jumped out in a panic. Experienced drivers know not to fight between the brake and accelerator—this isn't testing performance, it's destroying the car!
