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Advanced Engine Mechanical Diagnostics Assessment

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1. A technician is diagnosing a low power concern and finds low VE but normal fuel trims. Which of the following is the most likely cause:
- low fuel pressure
- inaccurate MAF sensor
- restricted exhaust
- stuck closed EGR valve
2. In-cylinder compression testing
- will detect all cylinder leakage faults
- cannot be used to detect valve timing errors
- can be performed with a FirstLook piezo sensor
- requires a compression hose that does not have a Schrader valve
3. A vehicle with a V6 engine has a very rough idle. The shown relative compression reading was recorded. Which cylinder indicates low compression?
firing Order
- #1
- #2
- #4
- #6
4. A volumetric efficiency test
- does not require the vehicle to be test driven
- can be performed with a lab scope
- requires the engine load PID
- requires a special calculator
5. A traditional compression test with a mechanical gauge
- can identify fuel trim concerns
- is an outdated test that should not be used
- can be used with a snap test to detect valve train issues
- will detect small amounts of cylinder leakage
6. A technician finds low compression on a cylinder and performs a cylinder leakage test. The results revealed 55% leakage and pressure building in the cooling system. Which of the following is the most likely cause:
- broken piston ring
- cracked piston wall
- failed EGR cooler
- burned exhaust valve
7. Which of the following would NOT affect cranking compression readings:
- cranking speed
- throttle angle
- weak ignition coil
- advance intake cam timing
8. While performing a running compression test with a manual compression gauge, the technician notices a rise in compression when the throttle is snapped. Why does this occur?
- increase in volumetric efficiency
- intake valve opens for longer duration
- EGR flow increased
- leaner air/fuel ratio
9. A cranking intake pressure test
- is performed with an advanced DMM
- can be used to identify valve train faults
- requires a graphing scan tool
- should not be performed on an overhead valve engine
10. A cylinder leakage test
- is not a replacement for a compression test
- provides an accurate percentage of air lost due to leakage past the valves
- can detect volumetric efficiency faults
- is useful for evaluating valve train performance

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