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Misfire Codes - How does this work?

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Old 08-20-2013, 10:46 AM
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Default Misfire Codes - How does this work?
For those that have been following my plight, I am continuing to get misfire codes along Bank A and specific cylinders.

Can someone explain to me "how" the ecu/bcm "knows" there is a misfire in a specific cylinder(s)?
 
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Old 08-20-2013, 01:57 PM
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When a cylinder misfires the crank rotates unevenly. So the ECM compares the crank and cam position to calculate the misfiring cylinder
 
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Old 08-21-2013, 03:54 PM
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Fantastic explaination Leaper! Thanks.
 
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Old 08-24-2013, 04:41 AM
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Default misfire
Not having read the full story regarding your problems, I would suggest replacing all the coils. Mine threw misfire/restricted performance codes on two occasions, requiring two new coils.
 
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Old 08-25-2013, 11:24 AM
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Thanks Pete,

I will consider what you said in your post.
 
Last edited by robertjag; 10-20-2013 at 08:45 AM.
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