What causes miss fires

either a lack of spark or lack of fuel or a mechanical fault ie burnt valve

well thats the basics anyway!

mis-fire should be detected by the ecu and it should log a fault code

its all to do with complying with emission standards etc
 
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As above, I had a coil gone the other week and replaced all 4. Caused a misfire which the diagnostics showed was in cylinder 1 :worried: expensive but at least they're all done. Last time I changed 2 in my old Audi the other 2 went soon after.
 
I had a lambda issue on my previous 172 cup. Caused all sort if mis fire issues... Also 1 thing to check, I noticed my cup leakes through the washer jets if its rained right on to the rocker cover near plug 4 just make sure there's no moisture down there
 
would misfire cause bad fuling?
Ive replaced the Knock sensor and its still doing it a little dosent feel quiet as much but its still there
 
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