Engine Diagnostics!

Presentation

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Instructional Technology

•

9th - 12th Grade

•

Practice Problem

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Easy

Brandon Spiller

Used 36+ times

FREE Resource

8 Slides • 6 Questions

Engine Diagnostics!

I will be providing scenarios and you will select the next step in the diagnostic process.

Good Luck!

Problem:

Problem: Mr. Washington brought his 2005 Lexus into the shop complaining of a knocking sound that seemed to coming from the engine.

Open Ended

Before doing any diagnostics what part or area on the engine do you think could be causing this problem. No right or wrong answers.

Type response here

More information:

After asking some more specific questions to the owner you find that the problem occurs at all engine temperatures. The knock noise is the same when the engine is hot or cold, but it does seem to occur more at idle compared to other engine speeds.

Open Ended

Based on this new information do you think it is any other parts or areas that could be causing the concern?

Type response here

Open Ended

What would you do now to begin to diagnositic

Type response here

Poll

What would you do now to begin testing/diagnosing this concern?

Pull spark plugs

Pinpoint the noise to a component or specific area

Drain the oil and look for metals

Return the car to the customer and say it is normal.

My choice would be to use a stethoscope in an attempt to pinpoint the noise.

This will let you listen to areas of the engine and find out where the noise is the loudest.

Diagnostic find #1

The knocking noise is the loudest when touching the stethoscope to the sides of the engine timing cover.

Multiple Choice

What would be your next step in this situation?

Remove and replace the engine

Remove the timing cover and inspect the timing chain

Remove the spark plugs

Connect an OBD 2 Scantool

After removing the timing cover you notice...

Timing chain is worn
Timing guides are worn
Contact marks on the timing cover

Multiple Choice

What repair would resolve this customers concern and get them back on the road?

A fresh oil change

A new timing chain and guides

A new timing cover gasket

New piston rings

Scenario #1

Mr. Washington's Lexus had a bad timing chain and guides that caused the chain slap noise, plus may have affected the engine timing causing the engine knock.

Engine Diagnostics!

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