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Oil pumps are an integral part of a vehicles mechanical system. While its rare that they need service or cause problems, a bad oil pump occasionally can negatively impact a vehicles performance and cause a variety of mechanical problems.
Low Oil Pressure
An oil pump is responsible for pressurizing engine oil and pumping it through a vehicles engine. A bad oil pump loses its ability to adequately pressurize and pump engine oil, resulting in low engine oil pressure.
Increased Temperature
Adequate engine oil flow helps keep an engines operating temperature down by reducing engine friction. A bad oil pump can lead to an increase in engine operating temperature by restricting normal engine oil flow, reducing engine oil lubrication and increasing engine friction, which leads to an increase in engine operating temperature.
Noisy Hydraulic Lifters
An engines hydraulic lifters, which are an important valve-train component, require adequate oil lubrication to function properly and quietly. Reduced oil flow and pressure caused by a bad oil pump can result in decreased oil flow to an engines hydraulic lifters, which leads to hydraulic lifter noise and wear.
Valve-Train Chatter
An engines valve-train system--including pushrods, valve guides, and seals--requires adequate oil flow and lubrication to function properly and quietly. A bad oil pump can cause an engines valve train to become noisy by reducing oil flow to the entire valve-train system.
Oil Pump Noise
In rare cases, a bad oil pump will make noise, normally a loud whining or whirring sound that can be heard when a vehicle is idling. As an oil pumps internal gear mechanism deteriorates and wears, the oil pump will make noise as it begins to fail.
