LT1-LT4 Modifications 1993-97 Gen II Small Block V8

!evap

Thread Tools
 
Search this Thread
 
Old Feb 19, 2009 | 05:08 PM
  #1  
MTBSully's Avatar
Thread Starter
TECH Fanatic
15 Year Member
Photogenic
Photoriffic
Liked
iTrader: (7)
 
Joined: Feb 2008
Posts: 1,265
Likes: 18
From: Bolton Masshole
Default !evap

anyone done this? I know probably no performance gains to be had but im trying to clean up the engine bay. Any write ups, opinions or info out there?

Thanks guys
Reply
Old Feb 19, 2009 | 05:20 PM
  #2  
ss.slp.ls1's Avatar
TECH Senior Member
15 Year Member
iTrader: (36)
 
Joined: Jan 2008
Posts: 8,184
Likes: 28
From: Orange County, CA
Default

Originally Posted by MTBSully
anyone done this? I know probably no performance gains to be had but im trying to clean up the engine bay. Any write ups, opinions or info out there?

Thanks guys
I removed mine.
Just yank it all out.
I read to put a breather on the hard plastic line that comes in the engine bay with the plastic fuel lines. But I just left mine uncapped inside the plastic sleeve.
Reply
Old Feb 19, 2009 | 05:39 PM
  #3  
Badazz 97 TA's Avatar
TECH Addict
iTrader: (18)
 
Joined: Aug 2007
Posts: 2,169
Likes: 2
From: Arizona
Default

Originally Posted by ss.slp.ls1
I removed mine.
Just yank it all out.
I read to put a breather on the hard plastic line that comes in the engine bay with the plastic fuel lines. But I just left mine uncapped inside the plastic sleeve.

do you remember how many SES codes you got with the evap gone?
Reply
Old Feb 19, 2009 | 07:15 PM
  #4  
ss.slp.ls1's Avatar
TECH Senior Member
15 Year Member
iTrader: (36)
 
Joined: Jan 2008
Posts: 8,184
Likes: 28
From: Orange County, CA
Default

Originally Posted by Badazz 97 TA
do you remember how many SES codes you got with the evap gone?
I removed all of my smog stuff at the same time I did my cam swap and put in my MadTuner tuned PCM...so no codes.
Reply
Old Feb 19, 2009 | 07:31 PM
  #5  
Badazz 97 TA's Avatar
TECH Addict
iTrader: (18)
 
Joined: Aug 2007
Posts: 2,169
Likes: 2
From: Arizona
Default

Originally Posted by ss.slp.ls1
I removed all of my smog stuff at the same time I did my cam swap and put in my MadTuner tuned PCM...so no codes.
so did Ion just delete all the evap codes or what?
Reply
Old Feb 19, 2009 | 07:32 PM
  #6  
ss.slp.ls1's Avatar
TECH Senior Member
15 Year Member
iTrader: (36)
 
Joined: Jan 2008
Posts: 8,184
Likes: 28
From: Orange County, CA
Default

Originally Posted by Badazz 97 TA
so did Ion just delete all the evap codes or what?
Yeah, he deleted all of the smog codes.
Reply
Old Feb 19, 2009 | 07:35 PM
  #7  
shutzero's Avatar
TECH Enthusiast
 
Joined: Sep 2008
Posts: 636
Likes: 0
From: Cheshire, CT
Default

its just one code for the evap. i just took mine out and had vince at trifecta tune it out in my tune
Reply
Old Feb 19, 2009 | 07:39 PM
  #8  
MTBSully's Avatar
Thread Starter
TECH Fanatic
15 Year Member
Photogenic
Photoriffic
Liked
iTrader: (7)
 
Joined: Feb 2008
Posts: 1,265
Likes: 18
From: Bolton Masshole
Default

i wonder if obdI will throw a code? Either way, if its gonna throw i code i just wont do it until i do my cam swap this spring and need a new tune anyways
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

 Brett Foote
story-1

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-2

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-3

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-4

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-5

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-6

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-7

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-8

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-9

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
Old Feb 19, 2009 | 07:46 PM
  #9  
ss.slp.ls1's Avatar
TECH Senior Member
15 Year Member
iTrader: (36)
 
Joined: Jan 2008
Posts: 8,184
Likes: 28
From: Orange County, CA
Default

Originally Posted by MTBSully
i wonder if obdI will throw a code? Either way, if its gonna throw i code i just wont do it until i do my cam swap this spring and need a new tune anyways
Just measure the resistance through the solenoids and wire up a resistor.
Reply
Old Feb 19, 2009 | 10:14 PM
  #10  
95 TA - The Beast's Avatar
TECH Regular
iTrader: (2)
 
Joined: Feb 2005
Posts: 412
Likes: 0
Default

Guys, you do know if you jsut leave it uncapped you have raw gas vapors leaking into the engine compartment. That coupled with the nylon gas lines is a recipe for a complete engine fire or explosion.

The evap system can't be capped off either because it will allow pressure to build up in the tank, which could eventually take out a fuel pump and cause a vapor-lock like condition.

I actually have experience with this situation... Went through a number of fuel pumps and had a nasty chemical burn for my troubles in understanding how the system works... It is still hooked up to my car to this day and it is far from a 'stock' setup... There is absoloutly no need to remove it...
Reply
Old Feb 19, 2009 | 10:19 PM
  #11  
ss.slp.ls1's Avatar
TECH Senior Member
15 Year Member
iTrader: (36)
 
Joined: Jan 2008
Posts: 8,184
Likes: 28
From: Orange County, CA
Default

Originally Posted by 95 TA - The Beast
Guys, you do know if you jsut leave it uncapped you have raw gas vapors leaking into the engine compartment. That coupled with the nylon gas lines is a recipe for a complete engine fire or explosion.

The evap system can't be capped off either because it will allow pressure to build up in the tank, which could eventually take out a fuel pump and cause a vapor-lock like condition.

I actually have experience with this situation... Went through a number of fuel pumps and had a nasty chemical burn for my troubles in understanding how the system works... It is still hooked up to my car to this day and it is far from a 'stock' setup... There is absoloutly no need to remove it...
I have mine uncapped way over in the corner of the engine bay. I don't see anything wrong with it way over there.
Reply
Old Feb 19, 2009 | 10:44 PM
  #12  
MadMike 97 Z28's Avatar
TECH Regular
iTrader: (3)
 
Joined: Apr 2007
Posts: 477
Likes: 1
From: Greenville, SC
Default

Originally Posted by 95 TA - The Beast
Guys, you do know if you jsut leave it uncapped you have raw gas vapors leaking into the engine compartment. That coupled with the nylon gas lines is a recipe for a complete engine fire or explosion.

The evap system can't be capped off either because it will allow pressure to build up in the tank, which could eventually take out a fuel pump and cause a vapor-lock like condition.

I actually have experience with this situation... Went through a number of fuel pumps and had a nasty chemical burn for my troubles in understanding how the system works... It is still hooked up to my car to this day and it is far from a 'stock' setup... There is absoloutly no need to remove it...
im not sure but I would think you could cap it off if you replaced the sealed gas cap with a vented one. that should prevent vapor lock and fumes in the engine bay.
Reply
Old Feb 20, 2009 | 10:21 PM
  #13  
Black94Z28's Avatar
TECH Fanatic
iTrader: (12)
 
Joined: Aug 2007
Posts: 1,818
Likes: 1
From: Cornfields near Pontiac, IL
Default

I did it to mine a little bit ago, pulled the whole system, heres some pics from my build thread...

This pic is of the actual canister located behind the drivers rear tire. Just kinda wiggled it free.


Here are the lines I pulled from the engine bay. The little block piece is attached to the intake by a 7 mm bolt. I ended up capping the TB where it connected to.


I just need to put a filter on the end of the main line so the gas fumes can properly vent



btw, i didnt end up throwing a code.
Reply
Old Feb 20, 2009 | 10:28 PM
  #14  
95 TA - The Beast's Avatar
TECH Regular
iTrader: (2)
 
Joined: Feb 2005
Posts: 412
Likes: 0
Default

Originally Posted by MadMike 97 Z28
im not sure but I would think you could cap it off if you replaced the sealed gas cap with a vented one. that should prevent vapor lock and fumes in the engine bay.
Actually, the vent only allows air in, not vapors out. There is also a white check-valve down near the fuel filter that does the same thing, that is why a vented gas cap is not needed on our cars...

So if pressure builds up there is no way for it to get out except to go through the evap system and into the intake...
Reply
Old Feb 24, 2009 | 08:01 PM
  #15  
MTBSully's Avatar
Thread Starter
TECH Fanatic
15 Year Member
Photogenic
Photoriffic
Liked
iTrader: (7)
 
Joined: Feb 2008
Posts: 1,265
Likes: 18
From: Bolton Masshole
Default

so do i just pull all of the hoses and stuff out and then leave the las hose uncapped somewhere? Or do i need a special filter? Thanks guys
Reply
Old Feb 24, 2009 | 09:06 PM
  #16  
Black94Z28's Avatar
TECH Fanatic
iTrader: (12)
 
Joined: Aug 2007
Posts: 1,818
Likes: 1
From: Cornfields near Pontiac, IL
Default

autozone sells a filter you can stick in there, pretty cheap too, couple bucks
Reply
Old Feb 24, 2009 | 11:26 PM
  #17  
MTBSully's Avatar
Thread Starter
TECH Fanatic
15 Year Member
Photogenic
Photoriffic
Liked
iTrader: (7)
 
Joined: Feb 2008
Posts: 1,265
Likes: 18
From: Bolton Masshole
Default

does deleting evap require a tune? Its not going to throw off my A/F ratio is it?
Reply
Old Feb 25, 2009 | 12:32 AM
  #18  
ss.slp.ls1's Avatar
TECH Senior Member
15 Year Member
iTrader: (36)
 
Joined: Jan 2008
Posts: 8,184
Likes: 28
From: Orange County, CA
Default

Originally Posted by MTBSully
does deleting evap require a tune? Its not going to throw off my A/F ratio is it?
No you don't need a tune, it might throw a code though, but I have read that you can just wire in resistors that matches the resistance of the solenoids.
Reply
Old Feb 25, 2009 | 06:40 AM
  #19  
rickreeves1's Avatar
On The Tree
 
Joined: Oct 2006
Posts: 125
Likes: 0
From: Metairie, La.
Default

I'm in the middle of my cam swap. Some of these lines are very brittle and are near breaking. I also don't like the clutter. It's just more crap to get in the way. I'd love to get rid of this stuff bit I'm still not sure what is safe to block off or pull. My EGR system is already gone. I've also read that most people are using a vented gas cap after this delete. There was some discussion that if you roll the car it could be more dangerous because gas will spill. In my vert I think I'd be screwed anyway.
Reply
Old Feb 25, 2009 | 09:47 AM
  #20  
Black94Z28's Avatar
TECH Fanatic
iTrader: (12)
 
Joined: Aug 2007
Posts: 1,818
Likes: 1
From: Cornfields near Pontiac, IL
Default

pull all the parts you see in the pictures above, put a cap on the throttle body and a inline filter on the main line to the gas tank and you are good to go
Reply



All times are GMT -5. The time now is 02:59 PM.

story-0
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

Don't get dad new socks or a grill brush this year.

By Brett Foote | 2026-06-09 14:55:56


VIEW MORE
story-1
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-2
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-3
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-4
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-5
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-6
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-7
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-8
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-9
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE