What Causes Unstable Throttle Response?

1 Answers
MacJocelyn
07/29/25 11:28pm
Unstable throttle response in a car could be caused by fuel supply issues. If the fuel pump pressure is insufficient, it may be due to prolonged periods without refueling leading to premature aging or damage of the fuel pump. It is recommended to replace the fuel pump, or it could be caused by a clogged fuel filter or leaking fuel injectors. Below are additional details: Insufficient Fuel Supply: A clogged or leaking fuel filter can also lead to insufficient fuel supply, resulting in jerky acceleration when pressing the throttle. It is advisable to replace the fuel filter and test drive to see if the issue resolves. The fuel filter typically removes large particulate impurities from gasoline, improving fuel quality, and should generally be replaced every 1-2 years. Poor Fuel Atomization: Clogged fuel injectors can lead to poor fuel atomization, potentially causing an overly lean air-fuel mixture, resulting in single or multiple cylinder misfires, and severe engine idle or acceleration vibrations. After removing the injectors, use a specialized tester to evaluate performance (usually by measuring fuel injection volume per unit time and observing atomization effects). Ensure injectors are removed and reinstalled in the correct order, and if new injectors are installed, an ECU relearn may be required. Damaged Spark Plugs or Ignition Coils: Severely carbon-fouled spark plugs can cause poor ignition, leading to intermittent misfires and unstable engine performance. Clean the carbon deposits from the spark plugs or replace them after reaching a certain mileage.
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