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Smelly exhaust and general exhaust questions
#1

My exhaust always has that sweet rotten smell. Is this a bad cat? When a cat goes does it clog and hurt performance? Is there a recommened upgrade? No, I won't bypass.

88TC, 80K miles. Just got it. Runs pretty well.

I was shocked to discover that the dual exhaust was stock. Personally I think it is silly. One aspect is that the worst thing about the 2.3 is that it vibrates a lot and to my mind all that extra steel under the car is just adding mass to resonate. When the time comes I would like to try a single exhaust. Probably 2.5" or more all the way back.

Has anyone else tried this.

I also think a single exhaust of generous size might peform better. There must be a good reason why every high performance inline 4 motorcycle has a single exhaust can. That reason would be better scavaging.

Bob Pierson
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#2

The best system is a 3" downpipe,3" Hi-Flow cat(or no cat [Image: wink.gif])single 3" pipe and a straight-thru design muffler such as a Dynomax Race Magnum or Ultra Flo.
Jerry R.
88 Turbocoupe
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#3

If you are talking about a "rotten egg" smell, the engine is running too rich, dumping unburned fuel in the exhaust. This is not good. It will cause the cat to overheat, destroy itself, and possible start a fire if it gets too hot.

The dual exhaust allowed the factory to claim a few more horsepower, and still stay emission legal.
If it ain't old, it ain't s***!!!!
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#4

I got the car a month ago. It used a lot of gas on the trip across the state brining it home. I did a code scan. Bad TPS, which I replaced but may need some adjustment. Now it is fault code free. Mileage last tank was low 20s, cold weather, 2/3 city driving.

I did a plug and wire replacement and the plugs looked really good.

So all in all it doesn't seem to be running really rich.

The fuel pump is loud and I want to do a pressure test. I have a gauge but no Schrader Valve hook up and can't find one.

Anyway, I've always associated the smell with a rich condition. Maybe it is a bit rich but not in the glowing red cat kind of rich. Can't it smell when the cat is going south?

Bob Pierson
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#5

Quote:Originally posted by joebltzfk:
If you are talking about a "rotten egg" smell, the engine is running too rich, dumping unburned fuel in the exhaust. This is not good. It will cause the cat to overheat, destroy itself, and possible start a fire if it gets too hot.

The dual exhaust allowed the factory to claim a few more horsepower, and still stay emission legal.


If the cat is getting too much fuel, it wouldnt overheat...in fact, it wouldnt heat up properly...Check for black smoot/liquids from the exhaust...You can get a CATCO 3" for ~$100 IIRC...If you want performace (quicker spool), you could do that TestPipe, which was insinuated earlier. I picked up 25hp/25ft-lbs (below peak) by switching to a test pipe...
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#6

If you want performace (quicker spool), you could do that TestPipe, which was insinuated earlier. I picked up 25hp/25ft-lbs (below peak) by switching to a test pipe

Test pipe? What the hell is a test pipe? And where was it insinuated earlier? Just curious. :-)



------------------
87TC 5spd with K&N and bleeder valve in wastegate hose with 18PSI yeeeeehhaaaaaaaa.
3G alternator conversion.
Cat removed for comfort :-)
All options with leather except for sunroof :-(
hounddog_26@yahoo.com
http://www.geocities.com/hounddog_26/DarkLite.html
87TC,5spd, T3, 3G Alternator.
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#7

[QUOTE]Originally posted by BigProbe:
[B]
If the cat is getting too much fuel, it wouldnt overheat...in fact, it wouldnt heat up properly.

Ok, Big Probe (???wishful thinking) check this site. [URL=http://www.autosite.com/garageqa/ques083.asp]

Look down under the heading CAUSES OF CONVERTER FAILURES. The first paragraph supports my point.

[This message has been edited by joebltzfk (edited 12-30-2001).]

[This message has been edited by joebltzfk (edited 12-30-2001).]

[This message has been edited by joebltzfk (edited 12-30-2001).]

[This message has been edited by joebltzfk (edited 12-30-2001).]
If it ain't old, it ain't s***!!!!
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#8

One more try: www.autosite.com/garage/repairqa/ques083.asp
If it ain't old, it ain't s***!!!!
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#9

Test pipe? What the hell is a test pipe? And
[/B][/QUOTE]

I don't know what BIG is talking about, but a "test pipe", when discussing converters, is a pipe used by shops when testing the converter to see if it is working properly. Its simply a piece of pipe that takes the place of the converter.
If it ain't old, it ain't s***!!!!
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#10

Quote:Test pipe? What the hell is a test pipe? And where was it insinuated earlier? Just curious. :-)
[/B]

Here:
Quote:The best system is a 3" downpipe,3" Hi-Flow cat(or no cat [Image: wink.gif])single 3" pipe and a straight-thru design muffler such as a Dynomax Race Magnum or Ultra Flo.

Test pipe is a straight metal pipe, which replaces the cat.... http://imagem.webphotos.iwon.com/1000015...073834.jpg



[This message has been edited by BigProbe (edited 12-30-2001).]
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