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beegee

beegee 1/18/2013

2006 Lexus IS250 Base 6 Cyl 2.5L

Engine

My check engine light and check vsc light on.

My check engine light and check vsc light on. No unusual driving changes noted.OBD scan shows PO0300 multiple random cylinder misfires detected.whats the cause? Spark plugs? Valves?

1 Answer


Jimm

Jimm 1/18/2013

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
Check also for any air leaks around the intake.

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