SOS Mechanic Certificate -Engine Tune-
up/Performance 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
The engine vacuum is low but steady - 🧠 ANSWER ✔✔Retarded Timing
The Purpose of catalytic converter - 🧠 ANSWER ✔✔oxidize hc co into c02
and h20
What vehicles are designed to go into a closed loop operation when - 🧠
ANSWER ✔✔all of the above
Diagram shows a vacuum hose connected to "p vacuum" this means the
hose should be connected - 🧠 ANSWER ✔✔above the throttle plate
If the voltage spike is not high enough on one cylinder, what is the most
likely source of the problem. - 🧠 ANSWER ✔✔a failed spark plug
wide-open-throttle the power train control module reverts - 🧠 ANSWER
✔✔open loop, rich mixtures
1
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, during a cylinder leakage test air escaping through the throttle body means
there is a leak at - 🧠 ANSWER ✔✔the intake valve
higher than normal oxides of nitrogen (n0x) emissions may be caused by -
🧠 ANSWER ✔✔all of the above
A reading of 8 volts on meter 2 while cranking would indicate - 🧠 ANSWER
✔✔an excessive ground circuit voltage drop
emission control systems are installed on engines to reduce what 3 specific
exhaust products - 🧠 ANSWER ✔✔Hydrocarbons, carbon monoxide and
oxides of nitrogen
You have verified a slow cranking complaint, which of the following should
you do next - 🧠 ANSWER ✔✔Determine the condition of the battery
The Egr System is designed to - 🧠 ANSWER ✔✔cruise
You are monitoring the tps signed voltage digital volt ohm - 🧠 ANSWER
✔✔A smooth voltage increase to about 4.5 v
an electronic fuel injected system that sprays into the throat of intake - 🧠
ANSWER ✔✔a throttle body injections system
2
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
up/Performance 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
The engine vacuum is low but steady - 🧠 ANSWER ✔✔Retarded Timing
The Purpose of catalytic converter - 🧠 ANSWER ✔✔oxidize hc co into c02
and h20
What vehicles are designed to go into a closed loop operation when - 🧠
ANSWER ✔✔all of the above
Diagram shows a vacuum hose connected to "p vacuum" this means the
hose should be connected - 🧠 ANSWER ✔✔above the throttle plate
If the voltage spike is not high enough on one cylinder, what is the most
likely source of the problem. - 🧠 ANSWER ✔✔a failed spark plug
wide-open-throttle the power train control module reverts - 🧠 ANSWER
✔✔open loop, rich mixtures
1
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, during a cylinder leakage test air escaping through the throttle body means
there is a leak at - 🧠 ANSWER ✔✔the intake valve
higher than normal oxides of nitrogen (n0x) emissions may be caused by -
🧠 ANSWER ✔✔all of the above
A reading of 8 volts on meter 2 while cranking would indicate - 🧠 ANSWER
✔✔an excessive ground circuit voltage drop
emission control systems are installed on engines to reduce what 3 specific
exhaust products - 🧠 ANSWER ✔✔Hydrocarbons, carbon monoxide and
oxides of nitrogen
You have verified a slow cranking complaint, which of the following should
you do next - 🧠 ANSWER ✔✔Determine the condition of the battery
The Egr System is designed to - 🧠 ANSWER ✔✔cruise
You are monitoring the tps signed voltage digital volt ohm - 🧠 ANSWER
✔✔A smooth voltage increase to about 4.5 v
an electronic fuel injected system that sprays into the throat of intake - 🧠
ANSWER ✔✔a throttle body injections system
2
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
