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Exam 7: Intake and Exhaust Systems

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Question 1

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Explain how you would use propane to find vacuum leaks.

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Low pressure propane may be used to locate the source of vacuum leaks. First the engine compartment should be inspected for sources of ignition in and around the engine compartment. With the engine running, small amounts of propane should be directed to points where possible leaks may occur. If propane is introduced to a vacuum leak, the idle will change because of the introduction of an extra fuel source to the engine. You should remove and reapply propane a few times to verify your first finding.

Question 2

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Explain the use of a vacuum gauge when testing for a restricted exhaust system.

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To use a vacuum gauge for diagnosing res...

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Question 3

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Intake manifolds are commonly made of ____________________ and ____________________ .

A poorly or non-functioning catalyst will fail the ____________________ monitor on an OBD II vehicle.

The three-way catalytic converter is designed to reduce ____________________ , carbon ____________________ , and ____________________ of nitrogen.

The ____________________ , located in the exhaust system, is used to reduce pollution.

1999 and new model year cars have sensors to indicate the efficiency of the catalytic converter.

A vacuum gauge fluctuates rapidly between about 12 and 17 in. Hg. This could be an indication of:

The ____________________ may need to be reset after an air filter replacement.

What are the benefits of combining a variable intake manifold with a variable valve timing system?

____________________ causes the internal parts of a turbocharger to rotate.

Technician A says that an engine developing 10" of vacuum at idle is a normal condition. Technician B says that engines with clogged exhaust systems will have more than 20" of vacuum when under throttle. Who is correct?

Technician A says that engines with multi-port fuel injection use plastic intake manifolds to cool the air-fuel mixture. Technician B says that intake runners that are short and large in diameter are designed for peak power at lower engine rpm. Who is correct?

A digital pyrometer is used to measure the amount of oxygen and carbon monoxide in the exhaust system.

Some exhaust manifolds with machined surfaces do not require a gasket.

Faulty turbochargers can cause excessive amounts of oil to be leaked into the exhaust system.

Propane can be used to locate the sources of vacuum leaks.

Technician A says that exhaust leaks can affect the air-fuel mixture of an engine. Technician B says that exhaust leaks can be dangerous for customers driving their car. Who is correct?

A cracked exhaust pipe before the upstream HO2S can cause all of the following except:

Describe the use of a backpressure gauge to test the exhaust system.