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Idling issue


Galant VR-4 org Post #: 953967 posted 12/01/10 01:08 AM     Remind Me!  Send Private Message   Edit Post      
I still cant figure out why my car idles at around 1400 then every few seconds drop to 1000 and rise up again. Anyone know what that is?

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Galant VR-4 org Post #: 954061 posted 12/01/10 11:58 AM     Remind Me!  Send Private Message   Edit Post   
That is idle surge, and idle surge is the condition that occurs when something in the ECU idle speed feedback loop fails to operate as expected. Since the ECU is not quite as smart as you are and has a very microscopic view of its world, its behavior may seem very strange to you, but seem perfectly normal to the computer. The result is an idle speed that oscillates from ~1200-1500 RPM about 2 times a second and no error codes are ever displayed. Since you are not accelerating it only goes a certain RPM before fuel is cut dropping the RPMs then it raises again starting a never ending cycle.


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