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Originally Posted by PDubs87Z28
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Originally Posted by Fasterthanyou
It's running rich. Replace the o2 sensor, it happens often and I just ran into the same problem (smell mostly) with my car before it got taken down last year. It was the o2 sensor going bad and the result was slightly rich. That made the cat stink and my HC was close to the inspection limit.
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also....last sunday i filled my car with shell 93 and drove around 130 miles on the highway just that day, it was a little above 3/4 tank. Then the past 3 days i noticed this and i have put 120 city miles since monday before filling up again today.
So say if i replace the O2 do u think i still need to replace the cat? Its two weeks old and i hear the heat shield rattle alittle. Let me know thanks |
The heat shield might not be rattling on the cat. With a 3rd gen the shield could be what's on the floor pan or the 2 touching. I've had to fight HARD with all of the cat's to get the heat shields off so I doubt the cat is 'bad'.
A new o2 sensor never hurt anybody and with todays gas prices it's hardly an expense. $20 for the sensor is like 3/4 of a tank of gas. You'll save that much in a few months just in gas savings. That is of course if the o2 is bad or going bad.
A new cat smells like rotten eggs when it's running slightly rich. Last question, is it a 3 way converter with an air pipe and do you have the air pipe hooked up and working? That makes a difference in the cat's efficiency.
__________________
, Jon
Owner of a Red Sled.
If it\'s EFI I can tune it. Specialize in 82-95 GM (yes Lt1\'s)
\"If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn.......Then, you have enough horsepower\" - Mark Donohue
