hey guys I just did a engine rebuild from blown head gaskets. I just got the car running, but it is rattling. I wanted to check the codes from the engine, i got 4. One is P0125, P0304, P0305 and P1000. I know that 304 and 305 are cylinder misfires. what could cause those? I did not have them before I blew head gaskets. Could my wiring on my fuel injectors be mixed up causign them to misfire? What other possibilities are there? and Can someone explain P0125?

 

Did you put in new plugs?

 

no. i had just put in new plugs about 20k ago

 

When you blow a head gasket it tends to ruin your plugs. Get a new set, I recommend NGK TR5's, about $14 a set.

 

wouldnt it have ruined all the plugs and not just one or two?? Also i cleared the codes and cylinder 4 came back but cylinder 5 did not. could it be a bad injector? I basically eliminated the wires in wrong spot based on how the wire was run.

 

usually you don't blow all the cylinders when you blow a head gasket since once pressure is relieved through one cylinder, maybe only 1 other one fails.

I just replaced mine a while back because one cylinder had a pinhole in it and the spark plug was white.

 

dumb question but how do i know if a spark plug is bad?