SOS MECHANIC CERTIFICATE -ENGINE
TUNE-UP PERFORMANCE EXAM 2025
NEWEST EXAM QUESTIONS AND
ANSWERS PASS GUARANTEED 100% ✅
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
during a cylinder leakage test air escaping through the throttle body means there is a leak at -
Answer ✅the intake valve
@2025 Exam Material 1
, 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
What is the function of the egr valve - Answer ✅it recalculates exhaust gasses into the intake
A customer brings vehicle to you with a concern of low power - Answer ✅all of the above
A reading of 1v on meter number 1 cranking - Answer ✅Do acceptable voltage drop
@2025 Exam Material 2
TUNE-UP PERFORMANCE EXAM 2025
NEWEST EXAM QUESTIONS AND
ANSWERS PASS GUARANTEED 100% ✅
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
during a cylinder leakage test air escaping through the throttle body means there is a leak at -
Answer ✅the intake valve
@2025 Exam Material 1
, 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
What is the function of the egr valve - Answer ✅it recalculates exhaust gasses into the intake
A customer brings vehicle to you with a concern of low power - Answer ✅all of the above
A reading of 1v on meter number 1 cranking - Answer ✅Do acceptable voltage drop
@2025 Exam Material 2
