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

tuning questions

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Old Mar 16, 2003 | 04:17 PM
  #1  
Rocks94z28's Avatar
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From: St. Louis, Mo
tuning questions

whats up guys, i recently went to pass emissions and i failed, but dont worry i registered in a different county the same day and have legal plates now.

anyways, i failed because i had to much hydro carbons at 4.9205 (legal limit is .800) the guy said this is due to unburned fuel in the exhaust, whats the cause? i have stock injectors/ pump

i also barely failed oxides of nitrogen at 2.2406 (legal limit 2.0)
i passed carbon monoxide and failed visual inspection because my air injection system is not hooked up,

i had the cutout closed and usually run it open and have a random technology cat.

my question is do i need to get my car retuned?
i had it done by pcmforless.com and since this i have done tb bypass, raised my compression to 11.5 and had my heads resurfaced and a new 3 angle valve job, new head gaskets,
2800 yank, transgo shift kit, built tranny,


do i need to send it back for a redo?

i also added msd6al instead of 6a.
i also have stock o2 sensors, does this affect anything?


basically i dont care about passing emissions i just want a properly running vehicle,


thanks and sorry for the length,

Jesse
Old Mar 16, 2003 | 05:13 PM
  #2  
Rocks94z28's Avatar
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TTT........
Old Mar 16, 2003 | 05:41 PM
  #3  
z28s's Avatar
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From: Windsor, Ont. Canada
High Flow Cats arn't the greatest for removing emissions from the exhaust gases......have you changed your spark plugs recently?
Old Mar 16, 2003 | 10:56 PM
  #4  
Rocks94z28's Avatar
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From: St. Louis, Mo
i replaced the ngk tr55's with ac delco platinums at 84k and i am at 94k,


TTT....
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