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Old 01-11-2012, 12:32 PM   #32 (permalink)
UFO
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Location: Denver, CO
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Colorado - '17 Chevrolet Colorado 4x4 LT
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Quote:
Originally Posted by Josh8loop View Post
So the N-18 duty cycle is not changed at all other than idle? I've never hooked up a LED to see if it pulses on an off. If it does change duty cycle than the vacuum applied to the EGR valve would change and EGR flow would also change.



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No, EGR is active all the times the ECM deems it necessary. It is only tested at idle.

The EGR is modulated with the duty cycle of the N18, I've seen it on an oscilloscope.
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