What Causes a Car to Stall When Accelerating After Starting?
2 Answers
Stalling when accelerating can be caused by the following reasons: 1. Dirty throttle body: This condition can cause the throttle plate to open less or become stuck during acceleration, leading to stalling. In this case, clean or replace the throttle body and perform throttle adaptation. 2. Faulty ignition coil, open or short circuit in the coil: Check by replacing with a new ignition coil for comparison testing. 3. Dirty fuel filter: The fuel system may not function smoothly during acceleration. Replace the fuel filter in this situation. 4. Faulty fuel pump: The fuel pump cannot maintain proper fuel pressure or provides insufficient fuel injection while driving, causing stalling during acceleration. Replace the fuel pump and clean the fuel tank if necessary. Also, inspect the throttle body and fuel injectors.
I've encountered this issue several times, usually due to fuel system malfunctions. For example, insufficient fuel supply from the fuel pump or clogged fuel injectors can cause the engine to stall when accelerating. It could also be caused by aging ignition coils or severe carbon buildup on spark plugs, resulting in weak sparks. Additionally, if there's an air leak in the intake manifold or vacuum hose, causing incorrect ECU adjustments, uneven air-fuel mixture after pressing the accelerator can also lead to stalling. I suggest first doing a simple check to see if the air filter is too dirty, and measuring the fuel pressure if necessary. Never test drive on highways—it's too dangerous. Get it to a professional repair shop immediately for proper diagnostic equipment to avoid turning it into a major problem.
