Smog Practice Study Guide Exam Latest 2026/2027 Updated
Verified Questions and Solutions A+ Pass Guaranteed
The vehicle fails the Smog inspection because of a tampered ECS. The
customer asks, " now what"? As a smog inspector, your responsibility is to
inform the customer that.
The vehicle must be repaired and there are no cost limit
Referring to the figure about, two Smog inspectors are discussing
Evaporative Emission (EVAP) system. Inspector A states that this is a Non-
Enhanced EVAP system. Inspector B state that this system does not
incorporate a Leak Detection Pump (LDP). Who is correct?
Both inspector A and B
The catalytic converter has been "gutted". What effect would this have on
the exhaust emission of a good running engine under a no-load
condition?
A. The HC and CO would be elevated, the CO2 would be lower than normal
and the O2 would be slightly higher.
The Charcoal canister is saturated with gasoline. How would this affect the 4-
gas readings during a TSI Smog Check, and at what engine speed?
A. High HC and CO at 2500 RPM
,A vehicle is in for an ASM inspection in an enhanced area. Upon initial
inspection, the technician notices the vacuum hose has fallen off the EGR
valve. How should the technician proceed with this inspection?
A. The technician may reconnect the vacuum line prior to the test.
Upon visual inspection, technician notices that the several ECS components
have been tampered. Which of the following statements apply to this
vehicle?
C. There are no cost limits to bring the vehicle to compliance
Two technicians are discussing the operation of a vacuum operated TAC
system on a carbureted engine. What happens to the blend door when
the engine is cold, and the vehicle is place in a wide-open throttle (WOT)
position?
B. It reverts to the cold air mode
The technician is performing a visual check of a vehicle during a TSI
smog check. During the check, it was observed that the vacuum hose at
point "Y", was broken. How would this affect emission?
C. HC would increase at idle
A vehicle is equipped with a non-PCM controlled vacuum controlled EGR
valve. What does the O2 sensor see when this EGR system activated?
A. The O2 sensor sees less oxygen in the exhaust
, What should the text do if a vehicle failed the Smog Check inspection and
the customer is convinced his/her vehicle was failed on purpose?
B. Refer customer to the State Referee
The technician is checking a vehicle prior to conducting an ASM smog test.
The left front tire is bald. How should the technician handle this situat?
A. Tell the customer that the vehicle is unsafe to test on a dyno and the tire
must be replaced
Two Technician are discussing the different types of Catalytic Converters.
There seem to be some confusion between "oxidizing", "reducing", "dual-
bed" and "three-way" converters. Which of the following statements best
describes the difference?
A. Three-way and dual-bed converters are both oxidizing and reducing
The TAC (Thermostatic Air Control) helps heat the incoming air to the
induction system. This Control is accomplished by a vacuum operated blend
door in the air cleaner snorkel. When the engine is not running ("0"
manifold vacuum), in what position is the blend door?
A. The "hot air mode"
A customer bring in a 1976 El Camino vehicle for a smog check. The vehicle is
California certified. The owner has replaced the original 350 V8 with a 1979
350 V8 of the same manufacturer. How should the technician proceed with
this inspection?
B. The 1979 engine must have all the required original emission controls.
Verified Questions and Solutions A+ Pass Guaranteed
The vehicle fails the Smog inspection because of a tampered ECS. The
customer asks, " now what"? As a smog inspector, your responsibility is to
inform the customer that.
The vehicle must be repaired and there are no cost limit
Referring to the figure about, two Smog inspectors are discussing
Evaporative Emission (EVAP) system. Inspector A states that this is a Non-
Enhanced EVAP system. Inspector B state that this system does not
incorporate a Leak Detection Pump (LDP). Who is correct?
Both inspector A and B
The catalytic converter has been "gutted". What effect would this have on
the exhaust emission of a good running engine under a no-load
condition?
A. The HC and CO would be elevated, the CO2 would be lower than normal
and the O2 would be slightly higher.
The Charcoal canister is saturated with gasoline. How would this affect the 4-
gas readings during a TSI Smog Check, and at what engine speed?
A. High HC and CO at 2500 RPM
,A vehicle is in for an ASM inspection in an enhanced area. Upon initial
inspection, the technician notices the vacuum hose has fallen off the EGR
valve. How should the technician proceed with this inspection?
A. The technician may reconnect the vacuum line prior to the test.
Upon visual inspection, technician notices that the several ECS components
have been tampered. Which of the following statements apply to this
vehicle?
C. There are no cost limits to bring the vehicle to compliance
Two technicians are discussing the operation of a vacuum operated TAC
system on a carbureted engine. What happens to the blend door when
the engine is cold, and the vehicle is place in a wide-open throttle (WOT)
position?
B. It reverts to the cold air mode
The technician is performing a visual check of a vehicle during a TSI
smog check. During the check, it was observed that the vacuum hose at
point "Y", was broken. How would this affect emission?
C. HC would increase at idle
A vehicle is equipped with a non-PCM controlled vacuum controlled EGR
valve. What does the O2 sensor see when this EGR system activated?
A. The O2 sensor sees less oxygen in the exhaust
, What should the text do if a vehicle failed the Smog Check inspection and
the customer is convinced his/her vehicle was failed on purpose?
B. Refer customer to the State Referee
The technician is checking a vehicle prior to conducting an ASM smog test.
The left front tire is bald. How should the technician handle this situat?
A. Tell the customer that the vehicle is unsafe to test on a dyno and the tire
must be replaced
Two Technician are discussing the different types of Catalytic Converters.
There seem to be some confusion between "oxidizing", "reducing", "dual-
bed" and "three-way" converters. Which of the following statements best
describes the difference?
A. Three-way and dual-bed converters are both oxidizing and reducing
The TAC (Thermostatic Air Control) helps heat the incoming air to the
induction system. This Control is accomplished by a vacuum operated blend
door in the air cleaner snorkel. When the engine is not running ("0"
manifold vacuum), in what position is the blend door?
A. The "hot air mode"
A customer bring in a 1976 El Camino vehicle for a smog check. The vehicle is
California certified. The owner has replaced the original 350 V8 with a 1979
350 V8 of the same manufacturer. How should the technician proceed with
this inspection?
B. The 1979 engine must have all the required original emission controls.
