DementedXJ
NAXJA Forum User
- Location
- Dayton, ohio
So my 98 xj ( auto 4.0) has started throwing a few codes and has a weird idle issue. The codes that have popped up here and there are, 306, 420, 171. the 306 and 420 i get pretty often, the 171 has only shown up once. It also gets a chugging idle once warm. It runs pretty much normal while driving but always comes back down to that chugging idle. and as a side note the exhuast does have a distinctive smell to it, not like fuel smell but almost a funky smell. not sure if that is lean or? I replaced all plugs, wires and the cap and rotor as well as o2's. it made no difference at all. This is my dd and the baby hauler since winter is here so i really need it to be dependable and im worried it is going to get worse. I can say it possibly has a cracked ex. manifold but i haven't found any cracks just hear a slight exhuast leak like a tick noise. any ideas???
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