Hi I have a 94 honda civic with a d15b7 it runs for about 5 mins then my spark plugs are so carboned they cant start. I cant figure it out no check engine light new distributor wires cap rotor ecu spark plugs, o2 sensor. I cleaned the intake ivac throttle. Changed out the injectors with junk yard ones. Rebuilt motor new crank, bearings rings. Used block, head wit 80k on it, and pistons and conmecting rodsi am about to blow my brains out because of it lol

 

Bump for help

 

Too much fuel? Smoking? TIming?

 

It was because the canister purge vauvl.

 

Was it bad, or one of your lines disconnected? I ask because I just found the vacuum line that goes from the throttle body to the purge valve disconnected, and wondering if that's why it sometimes doesn't want to start.

 

Could be, if it doesn't have enough vacuum it wont want to idle. Does it act like it wants to start and fall off?