Remove AIR system with TBI L03, any drawbacks? - Third Generation Pontiac Firebird (1982 - 1992) - Firebird Nation

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Remove AIR system with TBI L03, any drawbacks?


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3 replies to this topic

#1 David

David

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  • City:Crystal River
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  • Interests:Family and F bodies.
  • Year: 1989
  • Make: Pontiac
  • Model: Firebird
  • Engine: 305 L03
  • Transmission: 700R4

Posted A week ago

Was looking under the hood of my bird today and saw all that nasty looking tubing covering up the passenger side valve cover can't see anything or do anything over there.My question is if I decided to remove the air system would I end up getting a code / check engine light? Would I have problems with the fuel mixture on my TBI because I deleted it and all my catalytic converter? Also the oxygen sensor which I believe is mounted on the converter could be wrong about that please someone straighten me out. Thanks.

#2 David

David

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  • Year: 1989
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  • Model: Firebird
  • Engine: 305 L03
  • Transmission: 700R4

Posted 3 days ago

I'd still like some input on the matter. Even though I had taken my bird to an exhaust specialist does all kinds of custom exhaust jobs and whatnot. He told me my car was so nice that he would not alter it at all just keep it stock, don't bastardize it because it was not much to gain from any modification whatsoever. Stock is beautiful.

#3 Injuneer

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  • Year: 1994
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  • Model: Firebird Formula
  • Engine: 381ci LT1 stroker
  • Transmission: TH400 + GV O/D

Posted 3 days ago

I'll try and help, but I'm a 4th Gen guy and there are major differences in the AIR system between 3rd Gen and 4th Gen.  And my reference here is the 3rd Gen Chilton’s manual.  As far as codes go, I do not see any listed for the AIR system on any 3rd Gens, unless it is the one listed as “M/C Solenoid”, and that does not apply to your engine.

 

Deleting the AIR system will not affect how the engine runs, but it will increase emissions.  So if you have a tailpipe test, it’s likely it won’t pass.  If you have a visual inspection, the deletion will be obvious.  The only “gain” from eliminating the system is a very minor weight reduction and eliminating the small amount of power required to drive the pump.

 

When the engine is cold, the air from the pump is sent into the exhaust manifold to help burn the unburned hydrocarbons resulting from the rich cold start A/F mixture.  The heat from that combustion helps heat the catalytic converter up faster.  It doesn’t start to work until it reaches ~600°F.  When the engine is warmed up, the air flow is diverted to a port on the catalytic converter, in between the reducing and oxidation beds.  The air reduces HC and CO emissions.

 

From a personal point of view, I would agree with keeping the system for preserving the authenticity of the vehicle.  I'm also in favor of keeping systems that effectively reduce emissions.  I maintained all emissions systems on my Formula until it became a “track only” car.


1994 FIREBIRD FORMULA
FRED

 
381ci all-forged stroker (Callies Stealth, Oliver billet rods, BME 2618-T61 nitrous pistons) - 10.8:1 - CNC LT4 heads/intake - Comp Cams solid roller - MoTeC M48 Pro engine management - 8 LS1 coils - 58mm TB - 74#/HR injectors - 300-shot dry nitrous - TH400 - Gear Vendors 0.78:1 O/D - Strange 12-bolt - 4.11 Pro-Street gears - AS&M headers - true duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP / 800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117 MPH straight motor
 
https://www.firebird...9_698_32777.jpg

 


#4 David

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  • Year: 1989
  • Make: Pontiac
  • Model: Firebird
  • Engine: 305 L03
  • Transmission: 700R4

Posted 2 days ago

Thank you for the well thought-out in-depth technically adapt explanation it's appreciated. As you would imagine I have been studying up on this in Great Lengths spending many hours reading exactly how this system works and I concur with your analysis 100%. As a friend of mine used to say "stock is beautiful", I have to agree with him also God Rest his soul. Thank you again.




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