Engine Performance Chapter 8 Exam Questions & Answers (Grade A+).docx

Engine Performance Chapter 8 Exam
Questions & Answers (Grade A+)
Direct gasoline injection systems spray fuel directly into the
combustion chamber when the intake valve is opened.
True
False -
correct answer ✅False


The idle air control (IAC) valve controls the amount of fuel entering
the engine to maintain proper idle speeds.
True
False -
correct answer ✅False


The intake manifold turning valve (IMTV) makes the intake manifold
an active manifold, that is, it responds to changing demands.
True
False -
correct answer ✅True


Long term fuel trim will change in an attempt to keep short term
fuel trim near 0.
True

, Engine Performance Chapter 8 Exam
Questions & Answers (Grade A+)
False -
correct answer ✅True


Fuel pressure should be relieved prior to disconnecting fuel system
components.
True
False -
correct answer ✅True


An air-fuel ratio sensor does a better job than an O2 sensor of
determining just how rich or lean an engine is running.
True
False -
correct answer ✅True


To help isolate a clogged or dirty injector:
Check the resistance of each injector.
Use a noid light to check for a signal from the computer.
Perform an injector balance test.
Both A and C -
correct answer ✅Perform an injector balance test.