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ECM work without smog stuff on new motor?

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Old Apr 19, 2007 | 08:35 PM
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From: Joliet, IL
Car: 00 GMC 2500 4x4, 84 TA
ECM work without smog stuff on new motor?

I'm puting a new motor in my 84 TA, my question is if i remove all of the emissions stuff, will the car run right? I wanted to put a intake on the car but it require the removal of the EGR and i might as well get rid of everything else. Any help would be great, i wanted to get this car running within the next week or so since i bought it with a bad motor.
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Old Apr 19, 2007 | 09:38 PM
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Car: 88 Camaro
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Transmission: 700r4
Re: ECM work without smog stuff on new motor?

The 84 had a pretty simple computer system so with a carb and distributor with a vacuum advance the engine should run ok. Your tranny will work but I think you'll need the computer hooked up for the lockup torque converter to work if you want it to.
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Old Apr 19, 2007 | 10:28 PM
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From: Joliet, IL
Car: 00 GMC 2500 4x4, 84 TA
Re: ECM work without smog stuff on new motor?

my plan was just to pretty much leave the all the emissions related sensors unpluged
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Old Apr 20, 2007 | 01:04 AM
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Axle/Gears: 12B-3.73/9"-3.89
You're barking up the wrong tree, I'm afraid.

"Emissions" doesn't have to mean "low performance". Leave all of the sensors plugged in. If you really want, you can leave the A.I.R. and EGR off and unplugged, those won't cause the computer any problems. But, you do need the other sensors plugged in - engine coolant temp, manifold vacuum, oxygen sensor, barometric pressure sensor. Those are all needed to run the computer controlled carb and distributor.

See sig, then ask me how I know these things. . .
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Old Apr 20, 2007 | 01:19 AM
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Car: 1990 Pontiac Trans Am
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Re: ECM work without smog stuff on new motor?

The EGR sensor removal or disable will probably cause a code 32. That's the only one the computer looks at.

Not to mention being in violation of Federal emissions laws for removing or tampering with your street vehicle's stock emissions equipment, regardless of your state's emissions laws.
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Old Apr 21, 2007 | 10:13 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Originally Posted by Kevin91Z
The EGR sensor removal or disable will probably cause a code 32. That's the only one the computer looks at.
My EGR solenoid has been disconnected for months. Hasn't set a code yet.

There isn't any temp probe on carb EGR valves.
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Old Apr 22, 2007 | 01:08 AM
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Car: 00 GMC 2500 4x4, 84 TA
Re: ECM work without smog stuff on new motor?

did you remove the EGR?
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Old Apr 22, 2007 | 09:17 AM
  #8  
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Re: ECM work without smog stuff on new motor?

What if you went with an older engine. Could you then unhook the computer?
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Old Apr 22, 2007 | 04:47 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
If you put it in an older, pre-EGR car, yes.
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Old Apr 30, 2007 | 01:16 AM
  #10  
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Car: 89 TA
Engine: 305 TBI
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Re: ECM work without smog stuff on new motor?

Originally Posted by five7kid
You're barking up the wrong tree, I'm afraid.

"Emissions" doesn't have to mean "low performance". Leave all of the sensors plugged in. If you really want, you can leave the A.I.R. and EGR off and unplugged, those won't cause the computer any problems. But, you do need the other sensors plugged in - engine coolant temp, manifold vacuum, oxygen sensor, barometric pressure sensor. Those are all needed to run the computer controlled carb and distributor.

See sig, then ask me how I know these things. . .
I have an 89 TA TBI, so I could just rip out the AIR and EGR stuff without consequence and my engine would run properly? No emissions for me, hooray MO emissions laws! I guess I'd wanna switch to a cat without an AIR tube though, cause the AIR system helps run the cat, right? (no emissions, but I still have a conscious for the environment, besides, I wanna Hi-flow cat anyway)

I really want to un-clutter the engine bay and possibly lose that parasitic sucking of a fraction of a mpg and a hp or two, and this way I could get a cool intake manifold!
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Old May 1, 2007 | 02:10 PM
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Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: ECM work without smog stuff on new motor?

I guess you missed this part of the post:
Not to mention being in violation of Federal emissions laws for removing or tampering with your street vehicle's stock emissions equipment, regardless of your state's emissions laws.
The AIR tubes and EGR setup do not hurt the engine, especially a lo-po TBI, but they do a great job of cleaning up the engine's emissions. Just leave them on there until you change the engine over to drag race duty and take the car off the street. If I can get 375 HP and 450 TQ with 20+ MPG and still pass CA emissions, so can you.
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