Determining misfire?

Tiny
GJBETZEL
  • MEMBER
  • CHEVROLET
2001 Silverado 2500, 6.0

How does the computer determine which cylinder is missing? What sensors are involved?

As an in-shop test, I unhooked the knock sensors and a coil primary. Sure enough the CPU picked up the misfire. How?
Friday, January 5th, 2007 AT 10:26 PM

1 Reply

Tiny
SERVICE WRITER
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Different ones determine it different ways. One of them anyways, will measure the difference between firings of the cylinders by the crankshaft or camshaft sensor. When it sees a delay or the slight slowndown of rotation, it identifies which one should have fired and points it out in the way of po 300 to po306 codes (6 cyls).
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Friday, January 5th, 2007 AT 10:31 PM

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