drivernuts Posted March 2, 2012 Share Posted March 2, 2012 I'm getting my '99 LS400 serviced today and whil my wife was following me to the shop, she noticed brown smoke out the tailpipes ar idle but disappeared when accelerating. I've seen white smoke and blue smoke but never brown. Any ideas of what this might be? My scanner is throwing the codes for the cats being below efficiency but I don't know if that might be linked to the brown smoke. The car has 145K on it. Thanks for any thoughts. Quote Link to comment Share on other sites More sharing options...
landar Posted March 3, 2012 Share Posted March 3, 2012 Could be rust in the exhaust system or possibly carbon build-up. Have you tried an "Italian tuneup" lately? Quote Link to comment Share on other sites More sharing options...
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