What Causes the Great Wall Diesel High-Pressure Common Rail Engine to Fail to Accelerate?
2 Answers
Reasons are as follows: 1. Diesel filter needs cleaning: A dirty or clogged diesel filter causes insufficient fuel supply, resulting in the vehicle's inability to accelerate. Replacing the diesel filter will restore proper fuel flow and resolve the issue. 2. Clogged fuel injectors: Blocked fuel injectors lead to inadequate fuel intake, causing the vehicle to fail to accelerate. Cleaning or replacing the fuel injectors will restore proper fuel flow and solve the problem. 3. High-pressure fuel pump pressure leakage: Pressure leakage in the high-pressure fuel pump results in excessively low oil pressure, preventing acceleration. Repairing or calibrating the high-pressure fuel pump will restore proper fuel pressure and resolve the issue. 4. Air filter needs cleaning: A dirty or clogged air filter causes insufficient air intake and poor combustion, leading to the vehicle's inability to accelerate. Replacing the air filter will ensure adequate air intake and normal combustion, solving the problem.
After years of driving, when encountering insufficient acceleration in Great Wall diesel high-pressure common rail engines, it always feels like stepping on cotton with no power. Possible causes include fuel system failures, such as internal wear of the high-pressure fuel pump or clogged fuel injectors preventing sufficient fuel delivery; or issues with the electronic control system, like incorrect signals from the throttle pedal position sensor, causing the engine's brain ECU to not receive the acceleration command. It could also be due to a dirty fuel filter restricting fuel supply or air bubbles in the low-pressure fuel line affecting pressure. Additionally, poor fuel quality or long intervals between oil changes can lead to carbon buildup clogging the high-pressure rail. I recommend first checking if the fuel filter is blackened or the fuel tank level is low, but don't delay, as this concerns driving safety and can easily lead to accidents like rolling back on slopes. It's better to visit a professional shop early for diagnosis with specialized equipment to avoid minor issues turning into major repairs.
