sweety 0 Report post Posted May 9, 2014 what causes an engine cylinder to misfire? Quote Share this post Link to post Share on other sites
Arpit.v 101 Report post Posted May 11, 2014 In D.I. Diesel Engine - Improper Fuel Injection timing, Unbalanced governor, Defective Injector, Defect in timing gears or chain/sprocket. Burning of oil during combustion through cylinder liner route. In S.I. Engines - Improper Spark Ignition/Fuel supply. Oil movement to piston through cylinder liner route. 1 Goltoo Singh reacted to this Quote Share this post Link to post Share on other sites
G B Reid MIMechE, SIMarEST 74 Report post Posted May 23, 2014 To expand on Armit's answer..... ...in SI engines, you can have hot-spots where carbon deposits within the cylinder glow causing ignition points in the compression stroke (at the wrong time), valve wear and tear, valve clearances, incorrect spark-plug gap, blocked air filter, no air filter, incorrect valve timing (changing the volumetric efficiency), incorrect retardation during acceleration, incorrect valve timing, worn points/condenser, worn distributor advance mechanism, incorrectly tuned inlet ports, fuel emulsification of the inlet ports, insufficient atomisation of fuel, blocked exhaust, missing exhaust, Incorrect RON ("OCTANE RATING") of fuel, blocked carburetor jets/injectors....I'm sure there are likely to be a few more.... ...I'm a little out of practice with Diesel (CI) troubleshooting though. 1 ps garage reacted to this Quote Share this post Link to post Share on other sites
Daniele Di Martino 2 Report post Posted August 20, 2014 If i could add: In gasoline engine, the misfire is caused by a non-stoichiometric fuel ratio: when the mixture is too lean or too rich. 2 safo kofi and Johnpolo reacted to this Quote Share this post Link to post Share on other sites
er.ankit08 0 Report post Posted August 25, 2014 Sometime it bcoz of spark plug also. Quote Share this post Link to post Share on other sites
ducks13 0 Report post Posted December 30, 2015 No one seemed to mentioned low compression. Improper valve timing can also cause misfire. And as mentioned in varying degrees above improper fuel mixture or ignition. Quote Share this post Link to post Share on other sites
Hetal Patel 11 Report post Posted February 13, 2018 In a gasoline engine a "cylinder missfire" would be when the air and gasoline mixture in one or more cylinders does not ignite. Three general causes might be found. 1.) Ignition system defects (spark plug, plug wire, coil, etc) 2.) Fuel system problems (injector, improper fuel/air mixture ratio) 3.) Compression parts worn or damaged (piston, rings, valves, head gasket, etc.) Quote Share this post Link to post Share on other sites
