CHAPTER 27 POSITIVE CRANKCASE VENTILATION VALVE, SECONDARY AIR INJECTION

EXPLAIN THE PCV CARD TEST

REMOVE OIL CAP, PLACE 3X5 CARD ON OIL FILLER HOLE WHILE ENGINE IS RUNNING. THERE SHOUD BE VACCUM

WHEN THE INTAKE MANIFOLD VACCUM IS HIGH, SUCH AS IDLE, AND LIGHT LOADS THE PCV VALVE _______ TO MAINTAIN A BALANCE AIR/FUEL RATIO

RESTRICT

EXPLAIN THE PCV RATTLE TEST

SHAKE THE VALVE, IF THERE IS NO RATTLE THE PCV IS DEFECTIVE

WHAT CAN CAUSE AN ENGINE TO LEAK OIL ONLY WHEN IT IS OFF

THE PCV VALVE CREATES A VACCUM WHEN THE ENGINE IS RUNNIN

LIST THE COMPONENS OF THE PCV SYSTEM

-PCV VALVE/ORIFICE -AIR FILTER + HOSES

LIST 2 OF 4 PROBLEMS THAT CAN OCCUR IF THE PCV SYSTEM IS BLOCKED OR PLUGGED

-ROUGH OR UNSTABLE IDLE -EXCESSIVE OIL CONSUMPTION

DESCRIBE 3 LOCATIONS WHERE THE ORIFICE MAY BE LOCATED

-VALVE COVER -INTAKE MANIFOLD -HOSE BTWN VALVE COVER

WHAT PERCENTAGE OF AIR COMING INTO THE ENGINE AT IDLE FLOWS THROUGH THE PCV VALVE

30%

WHAT HAPPENS TO THE PCV VALVE WHEN THE ENGINE BACK FIRES

CLOSES INSTANTLY

WHAT IS BLOW BY

COMBUSTION PAST THE RINGS

WHY ARE THERE WIRES ON FORD PCV VALVES

HEAT THE PCV VALVE TO PREVENT FROM ICING

WHAT CAUSES THE PCV TO FLOW LESS AT IDLE

HIGH MANIFOLD VACCUM PULLS THE VALVE WHICH RESTRICTS THE PCV VALVE

UNDER ____ ___ ___ ___ THE SPRING IN THE PCV PUSHES THE VALVE OPEN AND ALLOWS MAXIMUM FLOW

HIGH SPEED/ HEAVY FLOW

ON TURBO ENGINES WHAT TYPE OF CRANKCASE VENTILATION IS USED

OIL/VAPOR WATER SPERATOR ORIFICE

WHAT CAN CAUSE A WHISTLING SOUND FROM THE REAR MAIN SEAL

PLUGGED PCV VENT CAUSING VACCUM IN THE CRANKCASE

WHY DOES GM CLIP THE HEATER HOSE TO THE PCV VALVE

PREVENT ICING OF THE VALVE

WHY IS THE PCV VALVE SOMETIMES REFERRED TO AN ANTI-BACK-FIRE VALVE

PREVENTS BACKFIRE FROM ENTERING THE CRANKCASE

WHAT IS THE MAIN REASON WE CANNOT LET THE BLOW-BY INTO THE ATMOSPHERE

UBURNED HYDROCARBONS

DESCRIBE WHAT IS AN ENGINE BACK FIRE

UNBURNED HYDROCARBONS IGNITE IN THE EXHAUST

WHERE IS THE PCV VALVE LOCATED

VALVE COVER OR INTAKE MANIFOLD

WHAT SHOULD BE DONE IF THE ENGINE FAILED THE 3X5 CARD TEST

VERIFY WITH ANOTHER TEST