P0300 P0301 P1399 on my 98 honda civic. What do I need to replace?
p0300 is general misfire code
p0301 is misfire #1 cyl
p1399 is no honda known code
i would start by running compression check and changing spark plugs possibly wires
Tech,I did the tune already like 2 weeks ago. I even check the compression on each cyclinder and they're not that bad at all. what's the next step???
double check spark plug on #1 also check wires cap and rotor
Tech,I smell gas on 1 cyclinder and on the spark plug. I think it's running lean.....should worry about that? That maybe the reason why the car is running rough!
if you are smelling gas it is either too rich or not firing
if i have helped please accept
honda dealership master mechanic since 1973