I've been getting cel code p0301 a couple times a day for a while. I changed out the plugs which were pretty black. Since changing the plugs I have only had the code once. Why am I still getting it. Can a misfire do damage

 

Yes it can if left undiagnosed it will. what is your current setup and how much driving do you do?

 

do you have any smoke coming out of the tail pipe? if so, what color is it? how much boost are you applying? how long have you been running the kit? Are you getting any other codes?

 

bad coil

 

dezod s1 kit 10lbs of boost. when i come to a stop theres white smoke from the tail pipe.

 

whats your a/f ratio? Have a good tune? White smoke usually isn't a good thing (headgaskets) but this doesn't seem to be the case. More info please!

 

its a good tune from ptunning. I think the smoke is just cause im running rich. At idle its like 14.5-15.2 at WOt its like 10.2-11.0

 

car runs great just throws the code about once a day. Also the old plug were very black when i took them out

 

ive seen this a couple times usually it pounds the plugs so you know its the problem, the crankshaft or the rods get warped a bit and it causes the pistons to hit the spark plugs and causes a missfire get it chacked out before it starts throwing off things like seals or whatnot just my opinion good luck seen this on ser sentras not tcs though just givin you my info

 

Dave, check your plugs. They are probably fouled out.

 

paul i replaced the plugs im pretty sure they were fouled. but it happens with the new ones but not as often

 

What's the gap on the plug?

 

Dunno just put them in straight out of the box. They are the 2 steps colder ngk

 

Gap is .044. Narrow it to .034 and make sure they are not carb'd up.

 

they have only been in for 3 days u think the could get messed up that quick

 

If the tune is that rich and/or you have your foot into the floor that much......

 

Just curious...I'm well aware of gapping plugs....but if I remember correctly...aren't the stock plugs in the tC a pre-gapped plug and changing that is a bad thing? I could understand if something moved or they had been replaced with a different type of plug than the stock ones...

 

if you dont change the gap you will get blow out you need to gap down when you go fi

 

noob question whats blow out

 

the spark cannot travel the distance that was set, so it blows out before its able to ignite the fuel mixture