Chapter6Diagnosis

Chapter6Diagnosis - Engine diagnosis On-board diagnostics...

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Engine diagnosis On-board diagnostics Codes for misfires (OBDII) Functional tests for power balance (Prior to OBDII) Further considerations Mileage Oil consumption Noises Copyright 2003 Gary Lewis - Dave Capitolo
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Check engine performance Valve-to-seat leakage causes . . . Rough idle Power loss Timing chain/belt failure can cause . . . No start Rough idle Mistaken for valve problem Misfiring cylinder causes . . . Rough idle Power loss
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Check engine performance Engine oil problems Leaks Oil consumption Misfiring from fouled spark plugs Smoke on acceleration – worn rings Smoke on deceleration – worn guides Valve related noises Popping at exhaust pipe - leaking exhaust valve Backfire through intake – leaking intake valve or exhaust valve not opening Valve lash noises – adjustment or wear in valve train
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Effects of temperature, frequency, and oil pressure Temperature Piston noises are effected by temp Piston noises are reduced with heat Frequency Noises at ½ crankshaft speed are valve train Noises at crankshaft speed are piston/rod assm.
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Diagnostic techniques Block check
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This note was uploaded on 01/06/2012 for the course AUTO 94 taught by Professor Davecapitolo during the Fall '03 term at DeAnza College.

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Chapter6Diagnosis - Engine diagnosis On-board diagnostics...

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