What Causes the Mazda6 to Experience Idle Fluctuations and Shaking?
1 Answers
Possible causes of engine idle shaking in the Mazda6 are as follows: 1. Intake manifold or various valve leaks: When air, gasoline vapor, or combustion exhaust that should not enter the intake manifold gets in, it causes the air-fuel mixture to become too rich or too lean, leading to abnormal engine combustion. If the leak affects only individual cylinders, the engine may experience more severe shaking, particularly impacting cold idle conditions. Common causes include: loose intake manifold clamps or cracked rubber hoses; leaking intake manifold gaskets; damaged intake manifolds or other components wearing holes in the manifold; leaking O-ring seals on fuel injectors; disconnected or cracked vacuum hose connectors; excessive opening of the Positive Crankcase Ventilation (PCV) valve; a constantly open charcoal canister valve; or an Exhaust Gas Recirculation (EGR) valve that does not close properly. 2. Fuel injector issues: Uneven fuel injection or poor atomization can lead to power imbalance among cylinders. Common causes include: clogged injectors, poor sealing, or fuel spraying in a stream rather than a mist. 3. Spark plugs and high-tension wires: Faulty spark plugs or high-tension wires can result in reduced spark energy or misfires. Common causes include: incorrect spark plug gap; eroded or damaged spark plug electrodes; carbon buildup on spark plug electrodes; cracked spark plug insulators; excessive resistance in high-tension wires; leaking insulation or connectors on high-tension wires; or eroded or poorly insulated distributor rotor electrodes.
