jefftrucker12
NAXJA Forum User
- Location
- arizona
just got a 89 cherokee and am going to build a buggy. it wont be street legal so wont have to pass emmisions but want it to run ok. it smoked blackish greyish smoke out the tailpipe and though it might need a tune up. i took out all the old plugs and they all had black soot on them. i went to auto zone and got new plugs cap and rotor. i put them in and today when i started it up it ran about the same. i took a new plug out that i just installed and it had black soot all over it after running for 15 seconds. what would cause this. the motor is supposed to be a ho 4.0