A cooling-system thermostat that sticks in a closed or partially closed po­sition, preventing hot coolant from flowing through the radiator, will cause engine temperature to rise. If the thermostat sticks in the fully closed position,…

Cables act as highways through which electricity flows to the spark plugs. In time, they can fail. When they do, voltage needed by spark plugs to ig­nite the fuel mixture won't reach the plugs, resulting…

Most engines manufactured since the 1960s have a positive crankcase ventilation (PCV) system, which prevents hydrocarbon vapors in the crankcase from escaping into and polluting the atmosphere. The central component of this system is the…

Engines equipped with electronic control systems, which are usually re­ferred to erroneously as computerized systems, have oxygen (O2) sensors that monitor the oxygen content of the exhaust. This includes all engines with throttle body and…

With the UK's increasingly congested road system accidents are inevitable, but which roads offer the safest journey; Single lane A road's, dual carriage ways or 3-4 lane motorways – the answer to this question may…

The fuel system of an engine equipped with a carburetor uses one of three types of filters to trap contaminating material that may be present in gasoline because of dirt in the vehicle fuel tank…