Wiley Coyote
NAXJA Forum User
- Location
- Anchorage, AK
My XJ went from driving great to running like crap in a matter of 2 days.
For some reason it likes to foul out spark plug # 3 and ONLY #3. In the last 2 weeks I’ve installed new injectors, cap, rotor, wires, coil, TPS, CPS and several sets of different spark plugs. I end up with the same thing every time: it runs great until I foul out spark plug #3. The rest of the plugs look fine, but #3 is nasty, sooty black and smells of gasoline. I’ve tested the plugs/wires and I’m getting good spark (put the plug/wires on the valve cover while friend cranked the engine). I also checked the injector harness with the node lights. The compression is #1-80, #2-80, #3-90, #4-85, #5-80, #6-80. Every thing checks out fine, just keeps fouling the same plug. If it was a horse, I’d shoot it. Anyone have ideas? Yes I did a search and came up with nothing useful.
Coyote
BTW It’s a ’91 Cherokee Limited, 4.0L, Auto, 4x4 with ~110,000 miles
For some reason it likes to foul out spark plug # 3 and ONLY #3. In the last 2 weeks I’ve installed new injectors, cap, rotor, wires, coil, TPS, CPS and several sets of different spark plugs. I end up with the same thing every time: it runs great until I foul out spark plug #3. The rest of the plugs look fine, but #3 is nasty, sooty black and smells of gasoline. I’ve tested the plugs/wires and I’m getting good spark (put the plug/wires on the valve cover while friend cranked the engine). I also checked the injector harness with the node lights. The compression is #1-80, #2-80, #3-90, #4-85, #5-80, #6-80. Every thing checks out fine, just keeps fouling the same plug. If it was a horse, I’d shoot it. Anyone have ideas? Yes I did a search and came up with nothing useful.
Coyote
BTW It’s a ’91 Cherokee Limited, 4.0L, Auto, 4x4 with ~110,000 miles