Soot around the end of brand new exha...

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Author Message   Eddie (Honu) Member Username: Honu Post Number: 67 Registered: 01-2003 Posted on Sunday, April 06, 2003 - 12:20 am:    i recently installed a new exhaust system on both my 95 disco and 93 lwb. after only a day i have noticed a black deposit around the rim of the exhaust pipe just under the rear bumper. the lwb which has had the system installed for about a week now does not have this build up. Could the disco be running rich? could leaks around the spark plugs cause this. I noticed when changing my plugs a couple of weeks ago that two of the sockets released a bit of air when unscrewing them. any way anythoughts would really be helpful. thanks   Curtis N (Curtis) Senior Member Username: Curtis Post Number: 2563 Registered: 05-2002 Posted on Sunday, April 06, 2003 - 12:49 am:    Hmmm...well, I am not so sure that what you are seeing is exhaust carbon from combustion. It may be blow-off from the charcoal in the catalytic converter if the cat is new. If it is not new then I can't think of any solid reason why the tips would be black so soon. Af far as the plugs leaking air: that is normal. They were the two pistons that were under compression so that is normal. Curtis   Eddie (Honu) Member Username: Honu Post Number: 68 Registered: 01-2003 Posted on Sunday, April 06, 2003 - 04:01 am:    great to hear that on the plugs. i thought i had some leaky seals there. yeah it seams to be dirty exhaust. burning rich maybe. the exhaust is new from behind the y pipe. its weird. i wish i could figure it out. anyone else have any ideas?   RVR OVR (Tom) Senior Member Username: Tom Post Number: 745 Registered: 07-2001 Posted on Sunday, April 06, 2003 - 11:20 am:    Running rich, time for new 02 sensors. Tom   Eddie (Honu) Member Username: Honu Post Number: 69 Registered: 01-2003 Posted on Sunday, April 06, 2003 - 01:03 pm:    o2 sensors are less than three months old and are working fine. the truck runs great other than that. could it be the idle possibly being a bit high?   Roland Kutasi (Disco1) Member Username: Disco1 Post Number: 42 Registered: 10-2002 Posted on Sunday, April 06, 2003 - 09:06 pm:    Time for a tune up.   Eddie (Honu) Member Username: Honu Post Number: 70 Registered: 01-2003 Posted on Monday, April 07, 2003 - 01:05 am:    yeah tune up was just done as well. new plugs and new 8mm magnecor wires.. i pretty much ruled out all of the obvious stuff. what else could it be. thanks for the input though