Jjcord2015
NAXJA Forum User
- Location
- Illinois
Patient vehicle:
2000 XJ sport
107k miles
4.0
NP231
California exhaust
Symptoms:
Rough idle
Poor gas mileage
CEL P0300
P0301
P0303
P0171
Black soot spits out of tailpipe
Spark plugs from cylinders 1,2,3 are fouled. Plugs from 4,5,6 look new.
I can tell it’s running rich, I can smell gas. Gets about 6-8 miles/gallon. I’m going to run a dry/wet compression test tomorrow to make sure its nothing mechanical, but I’m leaning more towards a exhaust leak or a sensor somewhere. I had the third, non o2 sensored catalytic converter stolen back in 2012 and a straight pipe was placed between the precats and muffler with no ill effects. Passed smog for several years like this.
Any ideas to look for before I drop it off at shop? Thanks.
Sent from my iPhone using Tapatalk
2000 XJ sport
107k miles
4.0
NP231
California exhaust
Symptoms:
Rough idle
Poor gas mileage
CEL P0300
P0301
P0303
P0171
Black soot spits out of tailpipe
Spark plugs from cylinders 1,2,3 are fouled. Plugs from 4,5,6 look new.
I can tell it’s running rich, I can smell gas. Gets about 6-8 miles/gallon. I’m going to run a dry/wet compression test tomorrow to make sure its nothing mechanical, but I’m leaning more towards a exhaust leak or a sensor somewhere. I had the third, non o2 sensored catalytic converter stolen back in 2012 and a straight pipe was placed between the precats and muffler with no ill effects. Passed smog for several years like this.
Any ideas to look for before I drop it off at shop? Thanks.
Sent from my iPhone using Tapatalk