ASE A1 STUDY GUIDE 2025/2026 QUESTIONS WITH
SOLUTIONS MARKED A+
✔✔Engine cranks, no start - ✔✔check valvetrain
✔✔Improper valve timing - ✔✔can cause reduced power and bent valves
✔✔A restricted PCV hose - ✔✔can cause oil accumulation in the air cleaner
✔✔excessive heat on a heater hose - ✔✔will cause it to become hard and brittle
✔✔Engine oil on a heater hose - ✔✔will cause it to be soft and gummy
✔✔Reduced turbocharger boost - ✔✔may be caused by wastegate valve stuck open
✔✔Torque to yield bolts - ✔✔provide a more uniform clamping force
✔✔Valve clearance of 1/64 - ✔✔may cause valve overheating and burning
✔✔Main bearing seal oil leak - ✔✔could be caused by faulty seal or bad PCV
✔✔High pitched squealing at hard acceleration - ✔✔leak in exhaust manifold
✔✔High pitched whistle at idle - ✔✔leak in intake manifols
✔✔Heavy thumping noise at idle - ✔✔caused by loose flywheel bolts
✔✔Removable valve seats - ✔✔can be removed by special puller
✔✔Valve spring height - ✔✔is measured from top of spring seat to top of guide
✔✔Worn turbo seals, worn valve guides, worn rings - ✔✔can cause blue exhaust
smoke
✔✔After replacing spun bearing - ✔✔flush oil passages and replace oil cooler
✔✔Straightedge - ✔✔is used to measure bearing alignment
✔✔Noisy or corroded water pump bearing - ✔✔can be caused by defective seal
✔✔Camshaft journal to bore exceeds clearance - ✔✔replace cylinder head
SOLUTIONS MARKED A+
✔✔Engine cranks, no start - ✔✔check valvetrain
✔✔Improper valve timing - ✔✔can cause reduced power and bent valves
✔✔A restricted PCV hose - ✔✔can cause oil accumulation in the air cleaner
✔✔excessive heat on a heater hose - ✔✔will cause it to become hard and brittle
✔✔Engine oil on a heater hose - ✔✔will cause it to be soft and gummy
✔✔Reduced turbocharger boost - ✔✔may be caused by wastegate valve stuck open
✔✔Torque to yield bolts - ✔✔provide a more uniform clamping force
✔✔Valve clearance of 1/64 - ✔✔may cause valve overheating and burning
✔✔Main bearing seal oil leak - ✔✔could be caused by faulty seal or bad PCV
✔✔High pitched squealing at hard acceleration - ✔✔leak in exhaust manifold
✔✔High pitched whistle at idle - ✔✔leak in intake manifols
✔✔Heavy thumping noise at idle - ✔✔caused by loose flywheel bolts
✔✔Removable valve seats - ✔✔can be removed by special puller
✔✔Valve spring height - ✔✔is measured from top of spring seat to top of guide
✔✔Worn turbo seals, worn valve guides, worn rings - ✔✔can cause blue exhaust
smoke
✔✔After replacing spun bearing - ✔✔flush oil passages and replace oil cooler
✔✔Straightedge - ✔✔is used to measure bearing alignment
✔✔Noisy or corroded water pump bearing - ✔✔can be caused by defective seal
✔✔Camshaft journal to bore exceeds clearance - ✔✔replace cylinder head
