Is this more than bad spark plugs?

Tiny
D3PL0Y3D
  • MEMBER
  • 1996 JEEP CHEROKEE
96 Jeep Cherokee 6cyl, p/t 4x4unstable rpm, black exhaust residue, dies when not being idled by someone. In Alaska, a couple months ago, it started acting up, tried to take it to a mechanic, but then it couldn't go over 10mph. With the black exhaust, I tried to change the spark plugs, but since it was -30, I couldn't tell if the wires were plugging in, and I couldn't get to the last one at all. I know that this could be entirely the plugs, but does it sound like anything else as well? Also, it turned out my winterization kit was installed crappy. I've noticed a couple time that the plugs going into the extension cord come out every now and then. If you are unfamiliar with Alaska, we have to install heater elements on the engine block, oil pan, and battery; so that's what I'm talking about there.
Wednesday, February 8th, 2012 AT 9:52 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
If there is a lot of black smoke, it sounds like it is running rich (too much fuel). I would try to get all the plugs replaced, check for vacuum leaks, and then have the computer scanned to see if there are any trouble codes.
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Wednesday, February 8th, 2012 AT 9:56 PM

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