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Advanced Engine Mechanical Diagnostics Assessment
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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
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
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
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
Which of the following would NOT affect cranking compression readings:
cranking speed
throttle angle
weak ignition coil
advance intake cam timing
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
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
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is an outdated test that should not be used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
In-cylinder compression testing
requires a compression hose that does not have a Schrader valve
will detect all cylinder leakage faults
cannot be used to detect valve timing errors
can be performed with a FirstLook piezo sensor
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
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