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b20v cylinder 1 misfire help

 
Old 01-10-2018, 11:10 AM
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Default b20v cylinder 1 misfire help

Hey guys new to the forum need some help.

built a b20v ycp pistons new bearing arp rod bolts and head studs, gsr head rebuilt by cylinder head rebuilders in portland or. so put this motor together with rdx injectors skunk 2 IM new distrib new ngk wires new plugs bkr7e, ecu is p72 with base map from a good tuner. Found out this issue when i brought my vehicle to get tuned. having misfire in cylinder 1 comp test is at 200psi rest is at 215-220, rest of cylinders run with no issue only started and ran fresh engine to bleed coolant system very fresh motor. pull the wire to 1 no change put new plugs already in it ran better for a little then right back to running rich black soot on plug. swapped injectors around no change, used a noid light blinking like it should. swapped ecu to p28 came off running vehicle just put my base map in it ran the same. at a loss guys oh also did valve lash might check it again when i get the car back to my house. any ideas fellas?
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Old 01-10-2018, 11:11 AM
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Default Re: b20v cylinder 1 misfire help

also replaced wires again thinking it was weak spark no change
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Old 03-12-2018, 03:55 PM
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Default Re: b20v cylinder 1 misfire help

Any ideas fellas?
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Old 03-12-2018, 08:32 PM
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Default Re: b20v cylinder 1 misfire help

Just saw an 8th gen Civic Si with a dead miss in one cylinder... compression numbers were good and the valve lash was spot on... turned out to be a cracked spark plug.
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Old 05-31-2018, 12:31 PM
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Default Re: b20v cylinder 1 misfire help

Not cracked spark plug on the porcelain ive got new plugs as well as swapped plugs around
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