wishihaddaxj
NAXJA Forum User
- Location
- Minnesota
Two days ago my jeep (01, 4.0l, automatic, 122k miles) was running fine, then on the way to work, I looked down, and I swear to god the speedometer went from 0-100-0 in an eerie wave. It started to miss at idle but accelerated fine, and then on the home, it started missing and bucking, with a flashing CEL. The only code it throws is p0306. I've researched extensively on this and other misfire codes, so I think I'm on the right track.
So far, I've:
Open questions/stuff still to try:
Anything I'm missing? Any suggestions? Words of encouragement? Random putdowns?
Happy holidays! :cheers:
So far, I've:
- Cleaned the battery terminals and grounds
- Checked all the fuses under the hood
- Sprayed out the TB
- Replaced plugs (copper autolites), correctly gapped, old plugs looked fine
- Replaced upstream o2 sensors
- Replaced TPS sensor (from dealership)
- Checked the cat (no rattles or weird smells, pressure out tail pipe seems okay)
- Checked the injectors with multimeter, all good
- Confirmed that #6 cylinder is missing - no change when #6 injector is unplugged
- Theres no water in the oil, and no bubbles in the radiator when I cranked/started the engine
Open questions/stuff still to try:
- Is it possible the #6 injector is bad, even though it has the same resistance as the others?
- I suppose the cat still be could be bad, even though it passed the above checks??
- Could be a coil rail problem, I've read there's no real way to check.
- I still need to do a compression test, could be cracked head or bad head gasket, and I'm starting to suspect this is the most likely.
- Finally, there's a wire tapped onto wiring for the #6 injector for my remote start. I checked, and the factory wire was never severed/broken, just stripped where the remote wire was soldered to it. The connection looks good and isn't corroded. Could that still be a problem?
Anything I'm missing? Any suggestions? Words of encouragement? Random putdowns?
Happy holidays! :cheers:
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