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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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Is the 2018 Hyundai iLoad van's diesel engine prone to injector seal leakage that may in some cases cause turbo failures?

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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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Low compression on number 2 cylinder

if you have low compression on just one cylinder the possibilities are
burnt valve
bent valve
loose seat insert
broken ring
scored bore
valve adjustment

Feb 24, 2015 | Cars & Trucks

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Compression cylinder low #2 and #3 cylinders.

there are only four possibilities left:
1: valves are not fully seating - adjust rocker arm / cam
2: piston rings are bad - replace rings
3: holes in pistons - replace
4: cylinders out of round - most complicated repair, bore / machine cylinders and replace piston rings with oversized rings.

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

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Repeated code P0301 and P0302

you don`t if say if you know but these codes mean misfire on cylinder 1 and cylinder 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 could have low compression on these two cylinders also.

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My 93 excel seems to be leaking pressure between cld 1&2 there is almost no pressure in these 2 wheras 3&4 has 175 psi in each which seems high. no external leaks, no water loss. only had car for...

The 175psi is not high for cylinder compression (I believe I interpreted it correctly). Two adjacent cylinders with low compression almost always means the head gasket has blown the fire ring between the cylinders. Pull the head, have it checked and or milled. New head gasket set, timing belt, oil change and get her going.

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