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PCV SYSTEM PREVENTS THE RELEASE OF BLOW BY GASSES FROM THE ENGINE CRANKCASE TO THE ATMOSPHERE. WHICH EMISSION DOES THE PCV VALVE SYSTEM REDUCE?
HC
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WHICH STATEMENT IS TRUE ABOUT EARLY EVAP SYSTEM?
THEY WERE CONTROLLED BY A PORTED VACUUM SOURCE
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EGR SYSTEM REDUCES EMISSIONS BY DILUTING THE AIR/FUEL MIXTURE WITH A CONTROLLED AMOUNT OF EXHAUST GAS. WHICH EMISSION IS REDUCED BY THE EGR SYSTEM?
NOX
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WHICH EMISSION ARE REDUCED BY THE EFE SYSTEM?
HC AND CO
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WHAT EMISSIONS ARE REDUCED BY USING AN OXIDATION CATALYTIC CONVERTER?
HC, CO, AND NOX
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WHICH EMISSIONS ARE REDUCED BY THE AIR INJECTION SYSTEM?
HC AND CO
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WHICH SYTEM MAY BE USED TO REDUCE NOX IF AN EGR VALVE IS NOT PRESENT?
VARIABLE VALVE TIMING
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WHILE DISCUSSING EGR VALVE OPERATION, TECH A SAYS THAT THE EGR VALVE OPENS UP FULLY AT WOT. TECH B SAYS MAXIMUM EGR FLOW OCCURS AT CRUISING SPEED WITH A LIGHT ENGINE LOAD. WHO IS CORRECT?
TECH B
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WHILE DISCUSSING THE PROPER WAY TO TEST A CAT CONVERTER, TECH A SAYS A PRESSURE GAUGE CAN BE INSERTED INTO THE OXYGEN SENSOR BORE AND BACKPRESSURE CAUSED BY A RESTRICTED EXHAUST OR PLUGGED CAT COULD BE MEASURED. TECH B SAYS A DELTA TEMPERATURE TEST MAY BE PERFORMED. WHO IS CORRECT?
BOTH
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WHILE DISCUSSING PCV SYSTEM DIAGNOSIS, TECH A SAYS A STUCK OPEN PCV VALVE MAY CAUSE ROUGH IDLE OPERATION. TECH B SAYS SATISFACTORY PCV SYSTEM OPERATION DEPENDS ON A PROPERLY SEALED ENGINE. WHO IS CORRECT?
BOTH
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EXCESSIVE HC AND CO EMISSIONS MAY BE CAUSED BY ALL OF THE FOLLOWING EXCEPT.
ENGINE MISFIRE
CAUSES: PLUGGED PCV SYSTEM, INOP AIR PUMP, ENGINE OIL DILUTED WITH GAS
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WHILE DISCUSSING A PCM CONTROLLED EVAPORATIVE (EVAP) SYSTEM, TECH A SAYS ONE CONDITION WHICH HAS TO BE MET FOR PURGING TO TAKE PLACE IS THAT THE EMISSION SYSTEM IS OPERATING IN CLOSED LOOP. TECH B SAYS THE PURGE CONTROL SOLENOID MAY BE "DUTY CYCLED" BY THE PCM. WHO IS CORRECT?
BOTH
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WHILE DISCUSSING TAIL PIPE EMISSIONS, TECH A SAYS CO EMISSIONS INCREASE AS THE AIR/FUEL RATIO BECOMES RICHER. TECH B SAYS CO EMISSIONS WILL INCREASE IF YOU HAVE AN IGNITION MISFIRE. WHO IS CORRECT?
TECH A
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WHILE DISCUSSING CAT CONVERTER DIAGNOSIS, TECH A SAYS A GOOD CONVERTER IS EVIDENT BY LOW CO2 IN THE EXHAUST. TECH B SAYS A RESTRICTED EXHAUST OR PLUGGED CAT CAN BE CHECKED BY USING A VACUUM GAUGE FOLLOWING PROPER PROCEDURES. WHO IS CORRECT?
TECH B
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TWO TECHNICIANS ARE DISCUSSING EGR SYSTEM. TECH A SAYS A DIGITAL EGR VALVE USES AN INTAKE MANIFOLD VACUUM SOURCE FOR ITS OPERATION. TECH B SAYS A LINEAR EGR VALVE HAS UP TO 3 SOLENOIDS CONTROLLED BY THE PCM. WHO IS CORRECT?
NEITHER. DIGITAL = 3 SOLENOID, ELECTRONIC, LINEAR = 1 SOLENOID
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WHICH FUEL DELIVERY SYSTEM BELOW WOULD NOT USE AN EFE SYSTEM?
PORT FUEL INJECTED
EFE: TBI, CARBURETED
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WHICH OF THE FOLLOWING COULD CONTRIBUTE TO AN INCREASE IN THE LEVELS OF NOX?
OVERLY ADVANCED IGNITION TIMING
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WHICH IS TRUE ABOUT EVAP SYSTEM?
MAY BE CONTROLLED BY THE PCM
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WHICH EMISSION IS REDUCED BY THE EVAP SYSTEM?
HC ONLY
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TECH A SAYS THE FIRST EMISSIONS WHICH WERE REDUCED WERE THOSE CAUSED BY "BLOW BY" GASSES. TECH B SAYS "BLOW BY" GASSES WERE REDUCED BY THE EVAP SYSTEM. WHO IS CORRECT?
TECH A
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