What Causes the Buick P0300 Engine Misfire Detection?

1 Answers
VanEloise
07/29/25 11:29pm
Buick P0300 engine misfire detection is primarily caused by a malfunction in the idle control system. Below are the detection methods and solutions: 1. Detection Method: When a cylinder misfire occurs, the crankshaft speed slows down due to loss of power. By monitoring the unevenness of engine speed and combining it with the camshaft sensor, the misfiring cylinder can be identified. Then, based on the crankshaft movement, the total misfire rate and the misfire rate of each cylinder are calculated and compared with the preset misfire rate threshold. If the value exceeds the threshold, the engine fault light will illuminate. 2. Solutions: Use a diagnostic tool to read the fault code; read the freeze frame information to confirm the working conditions when the fault occurred; clear the fault code and operate the vehicle under the conditions determined by the freeze frame; when checking the wiring harness, ensure good contact.
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