TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

Smog pump?

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Old Feb 27, 2010 | 12:14 PM
  #1  
4playta's Avatar
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Car: 1984 Trans Am
Engine: Built chevy 350
Transmission: TCI Built 700r4
Axle/Gears: 3.73 posi 10 bolt
Smog pump?

If I cut the belt to my smog pump will my exhaust be richer and in return tell my o2 sensor it is rich making the computer lean out the fuel ratio?
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Old Feb 28, 2010 | 01:40 AM
  #2  
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Re: Smog pump?

No, You probably misunderstand what the smog pump is doing. All the smog pump is for is to warm up your cats quicker, then they bypass and do nothing. Removing your smog pump will have no effect on how rich or lean your engine runs. Be aware however that removing your smog pump even if you are in a no smog check area is a Federal Crime (yes I know, but if the smog ****'s are around, they can nail you)

Last edited by jim_in_dorris; Feb 28, 2010 at 01:44 AM.
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Old Feb 28, 2010 | 11:28 AM
  #3  
4playta's Avatar
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Car: 1984 Trans Am
Engine: Built chevy 350
Transmission: TCI Built 700r4
Axle/Gears: 3.73 posi 10 bolt
Re: Smog pump?

Originally Posted by jim_in_dorris
Be aware however that removing your smog pump even if you are in a no smog check area is a Federal Crime (yes I know, but if the smog ****'s are around, they can nail you)
Thank you for the info, this is going to be a 100% off road vehicle.
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Old Mar 16, 2010 | 06:24 PM
  #4  
Stevolwevol's Avatar
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From: Michigan
Car: 86 IROC Z, 92 RS
Engine: 305 4bbl, 305 TBI
Re: Smog pump?

I cut the belt along time ago on my 86. Maybe a couple of horse power difference. No smog police around here thank god!
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Old Mar 16, 2010 | 08:29 PM
  #5  
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From: SELDEN,LONG ISLAND
Car: 1991 CAMARO RS,1997 FORD EXPLORER
Engine: NO MORE 305. 350 NOW
Transmission: 700R4
Axle/Gears: 273 NEED NEW ONES
Re: Smog pump?

i would like to bypass my smog pump what size belt whould i need? thanks
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Old Mar 29, 2010 | 08:17 PM
  #6  
Stevolwevol's Avatar
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From: Michigan
Car: 86 IROC Z, 92 RS
Engine: 305 4bbl, 305 TBI
Re: Smog pump?

I would check with Summit. I believe they have info on what you need.
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Old Jul 15, 2010 | 01:12 PM
  #7  
vendetta's Avatar
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From: Calgary, Alberta
Car: 1990 Iroc-Z28
Engine: 350HSR
Transmission: HD 700r4 B&M Stage2 SK
Re: Smog pump?

Originally Posted by anthonyrs
i would like to bypass my smog pump what size belt whould i need? thanks

ever find that belt size?
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Old Jul 15, 2010 | 01:17 PM
  #8  
Stevolwevol's Avatar
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From: Michigan
Car: 86 IROC Z, 92 RS
Engine: 305 4bbl, 305 TBI
Re: Smog pump?

My engine had a seperate v belt, so I could remove it w/o affecting the other belts.
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Old Jul 15, 2010 | 02:09 PM
  #9  
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From: Pepperell, MA
Car: 1987 Trans Am
Engine: LQ9/L92
Transmission: 4L60E
Re: Smog pump?

there's a good tech article on the site here on how to remove your smog pump:
https://www.thirdgen.org/serpentine
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