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post #1 of (permalink) Old 02-25-2004, 09:37 PM
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TBI information

i have an 82 chevy 1500 i also have a 350 out of an 87 that has tbi.. i'm putting the motor in my truck and want to know if i can put headers on it form my 82..... i'm not sure exactly what they are but there are tubes on the stock exaust manifolds... i think there exaust gas recirculation tubes...... i was wondering if i could get rid of these and if the motor would still run fine...... i dont need to pass emissions....... thanks
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post #2 of (permalink) Old 02-28-2004, 08:46 AM
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Re: TBI information

I have an 82 GMC 1/2 ton that has an engine from a 1990 Camaro TBI 305. I used the exhaust system and exhaust manifolds from my 1982 GMC 1/2 ton on to the 1990 305 motor without any problems. [img]images/graemlins/smile.gif[/img] I would think, that using headers designed for your 1982 truck should work fine on a 1987 350 TBI engine. I am using all the 1982 stuff on my 1990 Camaro engine, things like the alternator, power steering pump, and air conditioning parts / belts / brackets and water pump on my 1990 Camaro engine. I'm using an Edelbrock 4 barrel intake manifold designed to replace the TBI intake manifold. I needed to install an electric fuel pump in my 1982 truck because the 1990 Camaro engine did not have a place for me to bolt a fuel pump. [img]images/graemlins/frown.gif[/img]
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post #3 of (permalink) Old 02-28-2004, 09:12 AM
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Re: TBI information

I think those are AIR tubes; not sure what it stands for, just know its for emissions.
They are on the 87 engine right? Are you planning on using the TBI? I'm not too sure, but if you use the TBI, you'll also need the computer. It may or may not cause some problems if you get rid of the tubes.

Anyways, good luck with it.
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post #4 of (permalink) Old 02-28-2004, 02:06 PM
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Re: TBI information

It's AIR (air injection reactor). It's used to pump air into your exhaust manifolds to help burn off what's left and to help the reaction take place in your catalytic converters.

It isn't needed. You can scrap the AIR pump, diverter valve, and plumbing. Your truck won't even know it's gone.

However, you do need an oxygen sensor bung if you're going to fuel injection.
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post #5 of (permalink) Old 02-29-2004, 11:09 AM
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Re: TBI information

That'll be interesting -
The TBI engine has the AIR - air injection - into the manifold. It only injects air at certain times, but it's important for proper computer operation.

The computer "sees" the oxygen content in the downpipe AFTER the extra oxygen is added by the AIR. It's been programmed to compensate for that. All the components that have been suggested to be tossed work together as a "system."

Without the extra oxygen added by the AIR the computer will lean it out till it gets the expected amount of O2 in the downpipe - causing the engine to run super lean!
Warm-up will be near impossible, running will be terrible too. Codes will set, when it goes into "backup mode" even timing advance will stop working. You'll get just a set timing and a set amount of fuel.

Then the next post about it won't tell us how it got like that, but it'll want to know how to richen it.

Best to keep the new engine all together like it came unless you really know how to redesign the entire system.
That includes pump, injection tubes, EGR etc.

Or put a carb on it.

Kinda like saying kidneys and bladder make you pi--, so if you remove them you won't have to anymore.
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post #6 of (permalink) Old 02-29-2004, 04:21 PM
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Re: TBI information

Not all TBI engines have AIR. Mine is an 89, and it doesn't have it. He could get a computer for an engine without AIR, and remove all of the AIR tubes.
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