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Low compression in number 2 cylinder

Hyundai iload / imax

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David Harrelson

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Posted on Feb 26, 2015

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Why is there a cylinder 2 misfire?


Check these three things in the misfiring cylinder: spark, gas, and compression. One of them is wrong or missing. For spark check the spark plug and wire. Make sure you have spark on the plug wire, a strong blue spark. For gas, the fuel/air mixture may be wrong. Does the fuel injector pulse, putting gas into the cylinder? Possibly you may have a leaking injector or a clogged injector.

If gas and spark seem okay, you need to check compression in the cylinder. Low compression will cause a misfire. If compression is 20 or 25% lower than adjacent cylinders, that could be causing a misfire. For example, say numbers 1 and 3 cylinders had about 150 psi compression. 80% of 150 = 120, so if cylinder 2 is 120psi or less, that could be setting the misfire code. Low compression can be caused by valves not seating well, or bad piston rings, bad head gasket- something in the combustion area of the cylinder is losing compression.

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of course you could just have 'gunk' on the valves preventing full closure........

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you don`t if say if you know but these codes mean misfire on cylinder 1 and cylinder 2.you also don`t say if you tried anything to fix.check out plugs they may need changing,it could be bad ignition wires or dirty injectors,or even dirty valves(not closing completly)causing misfire.you could have low compression on these two cylinders also.

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