V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters

No cats = white smoke???

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Old Mar 11, 2008 | 10:48 AM
  #1  
ayrton02's Avatar
ayrton02
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Default No cats = white smoke???

I got my off-road setup on now. White smoke comes out of the exhaust now like it's cold outside - even when the car is warmed up, but its 60 degrees here in FL. Is this typical of an off-road setup?
Old Mar 11, 2008 | 11:05 AM
  #2  
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LilRoush
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Default RE: No cats = white smoke???

Did you delete the rear O2 sensors? Sounds like you're running rich.
Old Mar 11, 2008 | 11:08 AM
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ayrton02
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Default RE: No cats = white smoke???

ORIGINAL: LilRoush

Did you delete the rear O2 sensors? Sounds like you're running rich.
Nope, I have the MIL eliminators hooked up to them, but they are still there. I thought it would be black smokeif it was running rich.

I did a search and some of the guys in the 4.6 sec. said white smoke is common without cats. Dunno tho, that's why I'm askin.
Old Mar 11, 2008 | 11:13 AM
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LilRoush
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Default RE: No cats = white smoke???

Well, as long as you addressed the rear O2s, you should be good. I didn't get anything like that when I went cattless.
Old Mar 11, 2008 | 11:16 AM
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ayrton02
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Default RE: No cats = white smoke???

Well the guys at the exhaust shop said it would have white smoke likethis since there is oil/grease inside the new pipes to keep them from rusting. It's been a week now, so I dunno if all that would have burnt out now or not.
Old Mar 11, 2008 | 11:51 AM
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Default RE: No cats = white smoke???

mine smoked after i took out the cats too, but only like twice a month and only right when i started the car. it was pretty bad too... loooots of smoke lol. once i got it tuned that stoped though. is your check engine light still on? i bought mils too and they didnt work. i heard thatskind of a common problem.
Old Mar 11, 2008 | 12:37 PM
  #7  
The Yellow Pinto
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Default RE: No cats = white smoke???

yeah, the cats are like an exhaust filter...the element will kind of clean up the exhaust a bit...so it is the same exhaust, just not "filtered", if you will. you are right, black = rich. had a catless set up on my old car, and you could "see" the exhaust more so.
Old Mar 11, 2008 | 05:31 PM
  #8  
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ayrton02
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Default RE: No cats = white smoke???

ORIGINAL: songtradingusa

yeah, the cats are like an exhaust filter...the element will kind of clean up the exhaust a bit...so it is the same exhaust, just not "filtered", if you will. you are right, black = rich. had a catless set up on my old car, and you could "see" the exhaust more so.
What color was your exhaust-black or white/light gray? You can smell italot more, but that is expected I guess.
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