Engine Performance technology

The order describing the operation of a four- stroke engine is intake,compression power, and

• air-fuel

• intake closes

• exhaust

• crankshaft

Oil is added during a wet compression test,if the compression readings improve,this would indicate

• incorrect valve timing

• worn valve stem seals

• a burny valve

• worn piston rings

While testing intake manifold vacuum, a steady reading of 17 to 20 inches of mercury would indicate

• a good vacuum reading

• a manifold leak

• late ignition timing

• weak valve springs

Engine revolutions per minute are monitored by the_____ sensor

• vehicle speed

• crankshaft position

• mass airflow

The engine control module uses temperature,speed,and load to control the pluse width of a

• fuel injector

• vacuum solenoid

• diverter valve

• purge solenoid

Low engine power and a vacuum reading that drops as RPM increases would indicate

• a restricted catalytic convertor

• the head gaskets are leaking

• worn valve guides

• worn thrust bearings