What kind of noise does a failing water pump make?
If you hear a high-pitched, whining sound that increases as you accelerate – it could indicate a faulty water pump. These sounds are caused by a loose belt and the belt becomes loose when the pulley is loose or the bearings are wearing out.
Can a bad water pump cause misfire?
A water pump leak by itself cannot cause a misfire unless you overheated the engine and caused a blown head gasket or the coolant gets on spark plug wire causing misfire.
What is pump RPM?
Most pumps operate at rotational speeds between 1000 and 3000 rpm but frequently reach in excess of 6,000 rpm with special gearing and turbine drives. Larger centrifugal pumps (e.g. cooling water pumps for power stations), however, are typically mated to slow-running electric drives that are very costly.