ok so i started taking everything apart. got the I-pipe disconnected and the y-pipe and cat out together. now i find this thing. it was between the passenger manifold and y-pipe. it has a valve that looks like it closes.

1. what is it??
2. what does it do??
3. do i need it??
&
4. will i need to put it back on with my headers??

 

1. "EFE" or "early fuel evaporation" valve.

2. It closes when the engine is cold, sending exhaust from the passenger side head through the intake "cross-over" passage and out the driver's side head, warming the bottom of the intake plenum in the process so fuel won't pool there until the engine warms up.

3. I've been running without it since Nov '01.

4. Only if you use Edelbrock TES for LG4 or L69. Of course, if you do that, you haven't spent enough time on these boards.

 

ok so i'm getting hedman headers so i won't need it right? i bet i couldn't use it if i wanted to, right?

 

Right.

Right.

 

lol, i guess i really have nothing to worry about, i looked at it closer today and it doesn't look like it's even moved in a long time. and nothing was even hooked up to it, and if there was it wasn't very tight since it fell out.

 

Should have been a hard vacuum line from a thermo/vacuum switch on the intake manifold.

Would you mind measuring the ID of that valve? Chevy High Performance magazine in their "My Generation Camaro" series of articles blamed that valve for their poor performance with TES in the car vs. similar style but no EFE valve headers on the dyno. But, their car was an LG4, and the valve should be smaller on an LG4 vs. L69. I've got an LG4 valve in the garage attic, and it would be nice information to have for the people on these boards.

I passed emissions testing/inspection w/o the valve, but an **** Kalifornia inspecktor might fail you for not having it. If the L69 valve is larger, that's valuable information.

 

it looks to be right under 2 1/4 in ID.

1. is a rubber hose that connected to another metal hose that went to a sensor in the thermostat

2. is where it connected to the EFE valve. and it was just sitting there, nothing holding it in