SOS MECHANIC CERTIFICATION 2026 ALL
QUESTIONS AND ANSWERS SURE A+
✔✔If the ignition timing will not advance past base timing - ✔✔vehicle in limp mode
✔✔When spark Knock occurs - ✔✔The knock sensor signals microcomputer retard
✔✔When the microcomputer monitor air flow - ✔✔the proper amount of fuel can be
supplied
✔✔The power train control module used the TPS - ✔✔fuel pressure
✔✔A high gas level or heavy float in carberated - ✔✔Rich mixture
✔✔What increases the production of oxipes - ✔✔high combustion temp
✔✔On a OBD 2 system a loose gas cap - ✔✔The malfunction indicator lamp turns on
✔✔You have examined a set of spark plugs and found white - ✔✔The plug heat range
is too hot
✔✔With the vehicle operating temp and running at 2000rpm - ✔✔oxygen sensor
running rich
✔✔A tech is working on a car that has strong fuel odor - ✔✔Stuck open canister purge
valve
✔✔Higher voltages are required to fire signal - ✔✔the air fuel mixture ratio is made
leaner
✔✔Which of the following is true regarding fault codes - ✔✔fault codes can be
generated from past failures
, ✔✔A lean air fuel mixture could be - ✔✔a leaking intake manifold
✔✔Electronic fuel injection is best described by which - ✔✔electromagnetic raises the
plunges in
✔✔The oxygen sensor is reading low 02 context, what should it signal the computer -
✔✔En-rich air-fuel mixture
✔✔An EFI spays fuel into intake manifold near the intake valve - ✔✔a port injection
system
✔✔The scope pattern below was obtained 30kv - ✔✔29kv
✔✔Set the ignition timing on some vehicles - ✔✔computer controlled spark timing must
be disabled
✔✔A spark plug malfunction would appear - ✔✔A
✔✔What effect would a fouled spark plug have hydrocarbon emissions - ✔✔They would
increase
✔✔A tech is test driving a vehicle with a diagnose scan tool - ✔✔intermediate tps
✔✔A car runs rough back fires through throttle body - ✔✔faulty intake valve
✔✔Increases EGR flow at constant speeds - ✔✔increased FI pulse width
✔✔During a compression test you get a reading of 75psi dry+80 psi wet on 4 cylinder.
All other cylinders are at 140 psi. What does this mean? - ✔✔the valves are bad on
cylinder 4
✔✔An exhaust gas o2 sensor - ✔✔sends signals with are recognized by the
microcomputer during closed loop fail control only
✔✔During a cylinder leakage test, bubbles in the radiator would indicate - ✔✔the head
gasket
✔✔The engine coolant temperature sensor is out of range will - ✔✔cause drive ability
and gas millage concerns
✔✔The EGR valve is faulty, exhaust gas leaking into the intake manifold when the
engines idling can - ✔✔cause rough idle and stalling
QUESTIONS AND ANSWERS SURE A+
✔✔If the ignition timing will not advance past base timing - ✔✔vehicle in limp mode
✔✔When spark Knock occurs - ✔✔The knock sensor signals microcomputer retard
✔✔When the microcomputer monitor air flow - ✔✔the proper amount of fuel can be
supplied
✔✔The power train control module used the TPS - ✔✔fuel pressure
✔✔A high gas level or heavy float in carberated - ✔✔Rich mixture
✔✔What increases the production of oxipes - ✔✔high combustion temp
✔✔On a OBD 2 system a loose gas cap - ✔✔The malfunction indicator lamp turns on
✔✔You have examined a set of spark plugs and found white - ✔✔The plug heat range
is too hot
✔✔With the vehicle operating temp and running at 2000rpm - ✔✔oxygen sensor
running rich
✔✔A tech is working on a car that has strong fuel odor - ✔✔Stuck open canister purge
valve
✔✔Higher voltages are required to fire signal - ✔✔the air fuel mixture ratio is made
leaner
✔✔Which of the following is true regarding fault codes - ✔✔fault codes can be
generated from past failures
, ✔✔A lean air fuel mixture could be - ✔✔a leaking intake manifold
✔✔Electronic fuel injection is best described by which - ✔✔electromagnetic raises the
plunges in
✔✔The oxygen sensor is reading low 02 context, what should it signal the computer -
✔✔En-rich air-fuel mixture
✔✔An EFI spays fuel into intake manifold near the intake valve - ✔✔a port injection
system
✔✔The scope pattern below was obtained 30kv - ✔✔29kv
✔✔Set the ignition timing on some vehicles - ✔✔computer controlled spark timing must
be disabled
✔✔A spark plug malfunction would appear - ✔✔A
✔✔What effect would a fouled spark plug have hydrocarbon emissions - ✔✔They would
increase
✔✔A tech is test driving a vehicle with a diagnose scan tool - ✔✔intermediate tps
✔✔A car runs rough back fires through throttle body - ✔✔faulty intake valve
✔✔Increases EGR flow at constant speeds - ✔✔increased FI pulse width
✔✔During a compression test you get a reading of 75psi dry+80 psi wet on 4 cylinder.
All other cylinders are at 140 psi. What does this mean? - ✔✔the valves are bad on
cylinder 4
✔✔An exhaust gas o2 sensor - ✔✔sends signals with are recognized by the
microcomputer during closed loop fail control only
✔✔During a cylinder leakage test, bubbles in the radiator would indicate - ✔✔the head
gasket
✔✔The engine coolant temperature sensor is out of range will - ✔✔cause drive ability
and gas millage concerns
✔✔The EGR valve is faulty, exhaust gas leaking into the intake manifold when the
engines idling can - ✔✔cause rough idle and stalling
