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

How Crutial Evap System

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Old 09-22-2005, 06:03 PM
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How Crutial Evap System

Hey I was wondering how crutial the evap system on the lt1 is? Let me know thanks.
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Old 09-22-2005, 06:26 PM
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Re: How Crutial Evap System

threw mine in the trash.

keep it if you want heat.
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Old 09-22-2005, 06:44 PM
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Re: How Crutial Evap System

Originally Posted by white95

keep it if you want heat.
huh??
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Old 09-22-2005, 07:40 PM
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Re: How Crutial Evap System

Im also confused does it run the HVAC or what?
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Old 09-22-2005, 07:46 PM
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Re: How Crutial Evap System

Originally Posted by c0rey
Im also confused does it run the HVAC or what?
are you asking about the fuel evap system, has the vapor canister in it?
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Old 09-22-2005, 07:54 PM
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Re: How Crutial Evap System

http://shbox.com/1/evap_sol.jpg
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Old 09-22-2005, 08:03 PM
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Re: How Crutial Evap System

Originally Posted by c0rey
ok, not crutial, but wieghs very little, and removing it can(probably will) hurt you gas mileage

and the parts don't cost much if they happen to fail
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Old 09-22-2005, 08:12 PM
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Re: How Crutial Evap System

More or less just cluttery under the hood.
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Old 09-22-2005, 09:12 PM
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Re: How Crutial Evap System

You might get some gas fumes without it.
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Old 09-23-2005, 07:52 AM
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Re: How Crutial Evap System

Its not crucial, but it recovers fuel that can be burned in the engine, and it keeps the smell down at the back of the car. When I see people make comments like:
threw mine in the trash.

keep it if you want heat.
and
More or less just cluttery under the hood.
it makes me realize how little people actually know about the system.
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Old 09-23-2005, 10:12 AM
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Re: How Crutial Evap System

Originally Posted by Injuneer
Its not crucial, but it recovers fuel that can be burned in the engine, and it keeps the smell down at the back of the car. When I see people make comments like:
and

it makes me realize how little people actually know about the system.
agreed
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Old 09-23-2005, 11:13 AM
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Re: How Crutial Evap System

The only real problem I could see in having this on your car is that it puts more heat back into your engine because its pulled from the exhaust.
Atleast thats what i think i learned..
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Old 09-23-2005, 11:51 AM
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Re: How Crutial Evap System

Originally Posted by RedsTA
The only real problem I could see in having this on your car is that it puts more heat back into your engine because its pulled from the exhaust.
Atleast thats what i think i learned..
No.... you proved my point.

You are confusing it with EGR..... recycling of exhaust gas from the exhaust manifold to the intake manifold. And, net-net, EGR reduces engine heat because it quenches combustion chamber temperatures, by displacing oxygen.

The "EVAP" or "EEC" system pulls clean ambient air through the charcoal canister in the drivers rear fender, picks up some hydrocarbon vapor, and runs it in what appears to be the "third fuel line", through the EVAP purge solenoid, and into the side of the throttle body. From there, the ambient temperature air and fuel is burned in your engine.
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Old 09-23-2005, 12:28 PM
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Re: How Crutial Evap System

I'm pretty aware of what the system does and I chose to remove it, mainly because of the solenoid and the associated plastic lines which I found to be annoying. My system did fail, that was another factor and I've ensured that the gas tank is vented through a charcoal type filter. I haven't noticed any fumes.
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Old 09-23-2005, 01:44 PM
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Re: How Crutial Evap System

How do you purge you "charcoal type filter"?

I'm not arguing with anyone's decision to remove it..... its your car, do what you want with it. But for the guy who asked the question, some of the advice he got was simply incorrect, and displayed a general ignorance of what purpose the system served, and how it worked.... not uncommon with regards to the emissions equipment.

Somehow I manged to build an 800HP nitroused stroker (street driven), and kept all the emissions equipment intact and functional. It took a bit of creativity, because I had to integrate the stock PCM (controlling VSS, IAC and emissions) with an aftermarket ECU that controlled everything else. The car would pass NJ rolling emissions. Unfortunately, it wouldn't pass "visual" and now that NJ-DMV pulls cars over "at random" on the street and does a full rolling emissions check and a full visual, I don't drive it on the street.

Since its only a "track car", it no longer has cats, EGR, EVAP or AIR, but since it only gets driven about 1/4-mile at a time , I don't think I'm doing too much harm to the environment. And I kinda like the smell of C16......
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