Free ASE A1 Exam Flashcards

Confirm the customer's concern under the reported conditions and check service history, bulletins, recalls, and applicable specifications.

Possible late valve timing, an intake restriction, or uniformly poor cylinder sealing; compare the pattern with specifications and other tests.

An intermittent cylinder-sealing problem, commonly a sticking, burned, or weakly controlled valve.

Each cylinder's ability to build pressure while cranking; cylinder-to-cylinder consistency is as important as the absolute reading.

The oil temporarily helps seal piston rings. A substantial pressure increase points more toward ring or cylinder wear than valve leakage.

Leakage past an intake valve that is not sealing correctly.

Leakage past an exhaust valve that is not sealing correctly.

Leakage past the piston rings or damage to the piston or cylinder wall.

To compare how much each cylinder contributes by observing the change when that cylinder is disabled or analyzed electronically.

Engine oil is entering and burning in the combustion chamber.

Coolant may be entering a combustion chamber through a failed gasket, cracked head, or cracked block.

Possible connecting-rod bearing clearance, detonation, or another load-sensitive internal fault; isolate it before disassembly.

Battery state, cables, grounds, starting circuit, starter operation, and whether the engine turns mechanically.

A bulletin may document a known symptom, test method, calibration update, or repair that prevents unnecessary parts replacement.

Wear or damage at the thrust-bearing surfaces, or an assembly problem affecting crankshaft axial control.

Electronic symptoms can be caused by mechanical faults. Compression, vacuum, and leak-down results help prevent a false electrical diagnosis.

To quickly identify cylinders that create less cranking load before performing direct pressure or leak-down testing.

Identify the true source and flow path, verify the affected fluid, and correct the cause rather than only cleaning the visible area.

Fastener sequence, angle, reuse limits, lubrication, and sealant requirements vary; guessing can distort parts or cause failure.

Recheck test setup and conditions, verify specifications, and obtain a confirming test before replacing or disassembling components.

Use a precision straightedge and feeler gauges across specified directions, then compare the maximum gap with service limits.

A valve may not fully seat as parts expand, causing compression loss and burned valve or seat damage.

Valve-train noise, reduced effective lift or duration, and accelerated impact wear.

Excess clearance can cause oil consumption and poor seating; insufficient clearance can make a valve stick when hot.

Installed height determines spring load. Incorrect height can cause weak control, coil bind, or excessive stress.

Low power, poor starting, abnormal vacuum, emissions problems, or piston-to-valve contact on interference engines.

They are intentionally stretched during tightening and may not provide correct clamping force if reused when replacement is required.

Oil clearance between a journal and its bearing when used according to the product and manufacturer procedure.

A difference in bore diameter from top to bottom caused by uneven wear.

A bore diameter that differs when measured in different directions at the same height.

Each cap is machined with its matching bore and orientation; mixing or reversing caps can destroy alignment and clearance.

Pressure may be below the safe threshold. Stop and verify pressure; it is not a direct oil-level gauge.

Low supply, incorrect viscosity, pump or relief-valve faults, a restricted pickup, excessive bearing clearance, or internal leakage.

It limits excessive system pressure by diverting oil when pressure exceeds its calibrated value.

To fill passages and establish oil delivery before loaded surfaces rotate during startup.

It regulates coolant flow to help the engine reach and maintain its designed operating temperature.

External leaks and some internal leaks by applying controlled pressure without needing full operating temperature.

Higher system pressure allows coolant to remain liquid at a higher temperature, improving heat transfer margin.

Poor circulation, heater complaints, false temperature readings, localized boiling, or overheating.

Bearing lubrication and internal surfaces; find the leak source and correct contamination before operating the engine.

The control module's correction to commanded fuel delivery based on feedback and operating conditions.

The control system is adding fuel to correct a lean indication; investigate unmetered air, low fuel delivery, exhaust leaks, or biased sensing.

The control system is subtracting fuel to correct a rich indication; investigate excess fuel, restricted air, vapor purge, or biased sensing.

Air enters downstream of the airflow measurement point, so the engine receives more air than the control system calculated.

It provides crank position and speed information needed for ignition timing, injection timing, and misfire monitoring.

It identifies valve-cycle phase so the control module can synchronize sequential injection, ignition, and variable valve timing.

Higher firing-voltage demand, misfire under load, and extra stress on coils and insulation.

Backpressure rises, reducing airflow and power; manifold vacuum may fall progressively when engine speed is held above idle.

Outside air can enter the exhaust and bias the sensor lean, causing an incorrect fuel correction.

Confirm power, ground, control signal, circuit integrity, mechanical freedom, and the commanded-versus-actual response.