Stinky Stang

Put the smog stuff back on. I personally know three people that have gotten tired enough of the stink to put it all back together. Lack of cats and air pump = unburned fuel fumes coming out the tail pipe.

This stink has been common in all 9 of my previous mustangs lol and it only gets worse with miles!

you can use aftermarket cats with no air pump right?

I am putting a thermactor system back on soon and have chased a lot of codes trying to get rid of the stink at idle. No well running pre cat carb car would smell this bad - unless the choke is closed hot. I hope the cats and air pump freshen it up.

wythors said:

Put the smog stuff back on. I personally know three people that have gotten tired enough of the stink to put it all back together. Lack of cats and air pump = unburned fuel fumes coming out the tail pipe.

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He's right.

Either get a filter for your nose or fix the smog equipment....

Removing the pollution control equipment from a 5.0 Mustang is a bad idea. All you have accomplished is to make the computer mad and spit codes. The pollution control equipment all shuts off at wide open throttle, so the HP losses from it on the car are 2-5 HP. The catalytic converters may soak a few more HP than that. None of the pollution control equipment reduces the HP enough to cost you a race in anything but professional drag strip competition. I seriously doubt that you will be in the final runoff on “Pinks”, so leave the smog equipment in place and make sure it is working correctly.

Know what does what before removing it. Remove or disable the wrong thing and the computer sets the check engine light and runs in "limp mode". Limp mode means reduced power and fuel economy.

Here's a book that will get you started with how the Ford electronic engine control or "computer" works.

Ford Fuel Injection & Electronic Engine Control 1988-1993 by James Probst :ISBN 0-8376-0301-3.

It's about $20-$45 from Borders.com see http://www.amazon.com/ . Select books and then select search. Use the ISBN number (without dashes or spaces) to do a search

Use the ISBN number and your local library can get you a loaner copy for free. Only thing is you are limited to keeping the book for two weeks. It is very good, and I found it to be very helpful.


If you removed the smog pump and still have catalytic converters, they will ultimately clog and fail.

Remove any of the equipment and you will not pass a full smog check, cannot title the car in an area that does smog checks and have broken several federal laws. Granted that the Feds are short on people to check cars, but it is still Federal law.

7991LXnSHO said:

I am putting a thermactor system back on soon and have chased a lot of codes trying to get rid of the stink at idle. No well running pre cat carb car would smell this bad - unless the choke is closed hot. I hope the cats and air pump freshen it up.

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i have all the smog equipment on and no cats. it stinks. cats are the fix. not the smog stuff. but the two go hand in hand.

I'm looking for NEW high flow cats. Does Pypes make good products? I think I could have he muffle shop put their cats in my BBK X pipe for a lot less than a new BBK X Pipe with cats. There would probably be a T fitting and some smog pipe work of small diameter. Anyone have a clue on what kind of pipe and if the shops should have that size and kind of piping?

I recently welded some Magnaflow high flow cats on my offroad H-pipe. It was easy. I just measured, cut the section out of the H-pipe, slipped the cats on and welded them up. Before the cats my car stunk too. If driving with windows down it brought tears to your eyes. I HATED the car with no cats. Now with the cats I welded in I have no smell. I will NEVER have a car without cats again. EVER. I do have all the other smog equipment still on the car but I think the cats will cure 99% of your smell.

Chris

Pypes makes an excellent product especially for the price.

Newer catalytic converters do not use the Thermactor Air System (smog pump) because they are designed to work with an improved computer system that runs leaner and cleaner
They add an extra set of O2 sensors after the catalytic converters to monitor the oxygen and HC levels. Using this additional information, the improved computer system adjusts the air/fuel mixture for cleaner combustion and reduced emissions. If the computer cannot compensate for the added load of emissions due to wear and poor tune, the catalytic converters will eventually fail and clog. The periodic checks (smog inspections) are supposed to help owners keep track of problems and get them repaired. Use them on an 86-93 Mustang and you will slowly kill them with the pollutants that they are not designed to deal with.