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post #1 of (permalink) Old 12-29-2000, 12:57 AM Thread Starter
 
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exhaust smells

A couple of weeks ago I had my exhaust done on my 81 bronco. It is a 6 with the clifford headers and 4 barrel intake with a holley 390. The exhaust comes out of each header into a Y, into a Dynomax cat, and into a flowmaster big block II muffler and then out. I now am getting the rotten egg smell from the truck. What exactly is this and what is causing it? I believe that it is the cat being clogged. Can this be fixed if it is clogged? Any info would be good. Thanks

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post #2 of (permalink) Old 12-29-2000, 01:16 AM
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Re: exhaust smells

YEAP, sounds like a dead cat......YEAP, take it off bang out the baffles.....install!

1989 bronco...100 and something thousand miles...351...C6
post #3 of (permalink) Old 12-29-2000, 09:33 AM
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Re: exhaust smells


The rotten egg smell is the sulfer in unburnt gas burning inside the cat. This usually means your engine is running too rich. Check the condition of your spark plugs. Adjust your air/fuel mixtures and jetting.

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post #4 of (permalink) Old 12-29-2000, 10:03 AM
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Re: exhaust smells

Skipped the part about the new cat.....so don't knock the baffles out.

1989 bronco...100 and something thousand miles...351...C6
post #5 of (permalink) Old 12-29-2000, 10:44 AM
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Re: exhaust smells

Thump is correct. There are two main reasone for this. One is overactive catylist in the unit and the second is the engine is running rich. Incase you weren't sure, I described how you adjust the different components of the carb.

Adjust one idle screw for the most manifold vacuum and make the other match the turns. Run them both in about 1/4 turn. Check your main plug color for adjusting your main jets. Finally is the power valve. Drive around with a vacuum guage connected to manifold vacuum and monitor the readings when cruising at different speeds. You want the power valve to open at a vacuum level 2 inches below your cruise readings. For the squirter(s), I find you just have to play with them. Try squirters four sizes up and four sizes down and see what happens. If you have vacuum secondaries, make sure you don't have a real light spring in the diaphram. This will cause the secondaries to open too much.

Good luck, Eric.

If it ain't broke, I can probably still fix it.
post #6 of (permalink) Old 12-29-2000, 03:07 PM
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Re: exhaust smells

I used to get a real bad odor coming from the back of my Bronc. It was real bad when the back window was down. The smell went away when my dog,who used to ride back there, died.

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