mccoy
NAXJA Forum User
- Location
- cambridge, ontario, Canada
I've got a 1990 xj. It started running really rough a couple of days ago and there is an odd smell coming from the exhaust. The cat appears to be getting extremly hot aswell as the rest of the exhaust system. I checked for vacuum leaks and I did not find any. I did find that the rpm would increase if I created a large vacuum leak, i.e unplugging the vacuum hose that goes to the brake booster. I cleaned all of the spark plugs and checked the cap and rotor. The spark plugs were all black and sooty with a couple of them being wet with gas. I noticed an odour on the wet plugs similar to the odour at the tail pipe. I'm thinking i've got some bad gas. This vehicle has been sitting awhile with only starting and moving in the driveway.
Well, I put in some fresh gas and I took it for a drive hoping to remove any bad gas it the line but the engine lost power after about 5 minutes. I turned around and headed for home and when I looked under the jeep, the cat was red and the undercoating was on fire.I threw snow on it until the fire was out.
I have changed the cat and muffler. I started it and the cat was red in about 4-5 minutes. I'm sure it's running rich. If I were to unplug the O2 sensor, would that help or hinder. Is there any other sensors that could cause this problem? It is also backfiring through the exhaust a bit. This could be a timing issue but would timing cause the exhaust to get that hot?
Well, I put in some fresh gas and I took it for a drive hoping to remove any bad gas it the line but the engine lost power after about 5 minutes. I turned around and headed for home and when I looked under the jeep, the cat was red and the undercoating was on fire.I threw snow on it until the fire was out.
I have changed the cat and muffler. I started it and the cat was red in about 4-5 minutes. I'm sure it's running rich. If I were to unplug the O2 sensor, would that help or hinder. Is there any other sensors that could cause this problem? It is also backfiring through the exhaust a bit. This could be a timing issue but would timing cause the exhaust to get that hot?