Join Date: Dec 2004
Location: British Columbia, Canada
Feedback Score: 0 reviews
well, rotten eggs means that either you cat is not up to operating temp or the catalyst has been poisoned. the rotten egg smell happens when theres no cat or a failed cat.
running rich is a bad thing for the catalyst. the extra hydrocarbons will poison the catalyst over time, and it can regenerate itself back to normal if you let it operate without the presence of excess HC. but this can take a long time.
black is rich guys... blue is oil and white is anti-freeze.
just a black muffler means that you like WOT. at WOT, the stock computer tends to run the engine a little on the rich side to ensure theres no chance of detination. also the computer goes into open loop(ignores O2 sensor), and runs off of stock fuel maps. also when vtec engadges, it will richen the mixture to protect the motor for the sudden change in lift/duration on the cams.
i would suggest some injector clean to insure that the spray patturn is up to par. if the droplets are too large, there may not be enough time for complete combustion(ie. rich).
what mods do you have done? exhaust alone will cause it to run slightly rich, but not enough to cause problems.
if your engine is more than I/H/C/E, then without tuning, you can run rich.
do you actually see a black cloud of smoke when someone drives behind you? if you dont... its normal for you to see carbon buildup on the tip becouse of your driving habits.