Converter Efficiency Charts

Saturday, 13 December 2008 20:53 administrator

CONVERTER EFFICIENCY CHARTS:

Converters can only work efficiently if the engine is operating properly and the exhaust is leak tight. The charts at below show the typical relationship of engine exhaust, converter efficiency and resulting tailpipe emissions measured during emission tests. Both too- rich or too-lean conditions can cause emission failures.

HC	CO	NOx	Possible Cause or Recommended Action
High	High	High	Replace converter and O2 sensor; verify tune-up and correct any faults
High	Low	High	Replace converter, tune-up & check lean AFR, leaking exhaust valves
Low	High	High	RReplace converter and O2 sensor
High	High	Low	Rich AFR, air injection
High	Low	Low	Run-in converter, tune-up, oil change
Low	Low	High	EGR, lean AFR, leaks, run-in converter, use larger converter
Low	High	Low	O2 sensor, rich AFR
Low means less than the test fail point; high means near or above the test fail point.

Last Updated ( Monday, 19 January 2009 23:28 )

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