Why does my truck die when I hit the brakes?
Most likely you have a problem with your IAC (idle air control) valve. They get gummed up with carbon deposits and stick. One other possibility is your power brake booster has a vacuum leak. This can easily be tested for by pinching off the hose connected to the brake booster and pressing on the brake pedal.
Why does my car stall when I press the brake?
Stalling. One way the car stalls is if there is a leak in the brake booster, either by a blockage of the vacuum hose or a cracked, ruptured or leaking diaphragm. Stalling can also happen if there is a brake line obstruction, either by a chunk of rust or a pinched brake line.
What causes an engine to sputter and stall?
Your fuel system is faulty The most common cause of a sputtering engine is an issue with the fuel delivery system; these include; the pump, filter, and injectors. Since all these components work together, if dirt or debris clog on any part, the others will fail to lead to poor engine performance or stalling.
What does engine surging mean?
Engine surging is when an engine starts easily and accelerates smoothly, however after a few minutes at a steady speed, it either surges in speed or misfires. Misfiring happens when one of the cylinders of an engine’s combustion cycle fails.
Why is my engine sputtering?
One of the most common causes of a sputtering engine is an issue with the vehicle’s fuel system—the filter, pump, and injectors. Since the fuel filter, pump, and injectors work together as part of one interconnected system, dirt and debris need only clog one part to cause the others to fail.
What causes sputtering at idle?
What to Look For: Rough idle, slow acceleration, sputtering or a lack of power on acceleration are all symptoms of a leak in the vacuum system. Over time, this valve can become stuck open or closed, and performance issues, including rough idle, are the most common systems.
Why does my mower rev up and down?
A lawnmower that hunts and surges may be experiencing something as simple as an airflow issue. If the air that the engine requires to run is blocked, especially sporadically, it can cause the engine to slow down. When the blockage moves or clears, the engine may suddenly rev up in response.