LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Car puff black smoke threw up shifts and at deacceleration

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Old Jul 5, 2005 | 06:22 PM
  #1  
Domn8er's Avatar
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From: Dallas Texas (frisco)
Car puff black smoke threw up shifts and at deacceleration

My friend was behind me and said my car threw a little puff of smoke after each upshift or when I am deacceleration at high rpms. Wondering if you guys get the same thing
Old Jul 5, 2005 | 06:37 PM
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Re: Car puff black smoke threw up shifts and at deacceleration

Could be one of the O2's
Old Jul 5, 2005 | 11:29 PM
  #3  
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Re: Car puff black smoke threw up shifts and at deacceleration

Thanks for all the replies...it was of great help!
Old Jul 5, 2005 | 11:30 PM
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Re: Car puff black smoke threw up shifts and at deacceleration

You running rich?
Old Jul 5, 2005 | 11:40 PM
  #5  
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Re: Car puff black smoke threw up shifts and at deacceleration

the car doesn't seem to be running rich......no smells.....no smoke on start up.......only mods are cai, gutted cat, gmmg, tb bypass. I only get a small puff of smoke right at redline during the upshift.
Thanks
Old Jul 6, 2005 | 01:24 AM
  #6  
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From: NY...what a bad place for a nice car
Re: Car puff black smoke threw up shifts and at deacceleration

Originally Posted by Domn8er
the car doesn't seem to be running rich......no smells.....no smoke on start up.......only mods are cai, gutted cat, gmmg, tb bypass. I only get a small puff of smoke right at redline during the upshift.
Thanks
gutted cat is one of the main reasons , im sure other ppl can chime in on this one
Old Jul 6, 2005 | 01:44 AM
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Re: Car puff black smoke threw up shifts and at deacceleration

Lt1's are programmed to fatten up the fuel mixture in the rpm.
Old Jul 6, 2005 | 07:01 AM
  #8  
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Re: Car puff black smoke threw up shifts and at deacceleration

That's fairly common. I noticed mine does it, especially if I downshift, or let off the gas after accelerating.
Old Jul 6, 2005 | 01:24 PM
  #9  
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Re: Car puff black smoke threw up shifts and at deacceleration

my car does it when i go WOT and it downshifts lol, the gutted catt will worsen it , its nothing to worry about untill it starts doing it alot and massive plumes form lol
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