Sean kraenbring Posted June 8, 2021 Report Share Posted June 8, 2021 I have a 2010 Dodge journey with a 3.5 L had a misfire in center bank replaced all the coil packs and plugs put back together they are heavy white smoke doesn’t smell like antifreeze maybe a little oil and sulfur what do you think it could be Quote Link to comment Share on other sites More sharing options...
5rebel9 Posted June 8, 2021 Report Share Posted June 8, 2021 When you pulled the coils and plugs, was there engine oil on them.? If I'm not mistaken, they sit in deep "wells. And if the valve cover gasket and well seal leak oil thru can cause a misfire on affected cylinder(s). Also IF so and removing the spark plug(s), that oil would then leak down into the cylinder and would cause smoke as the oil was ignited(?) and passed thru the converter/exhaust. Quote Link to comment Share on other sites More sharing options...
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