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Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315

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Chapter
Section
BuyFindarrow_forward

Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315
Textbook Problem

Describe how engine misfire is detected in an OBD II system.

To determine

The way through which engine misfire is detected in an OBD II system.

Explanation

When an engine cylinder misfires, due to lack of proper combustion hydrocarbons are released from the cylinder. Misfiring also reduces the engine power. An OBD II detects the engine misfire by monitoring the speed of the crankshaft. OBD II can measure the misfire range but cannot determine the cause of the misfire. Engine misfires are classified as A-type, B-type and C-type based on the level of emissions. In case of A-type if the misfire ranges from 2% to 20% then it is considered to be excessive...

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