I’m currently preparing to complete a Holley Terminator swap on my 1998 Camaro. In addition to that, I’ll be removing the factory PCM and LS1 and will be swapping in a Gen 3, 6.0 LQ4.

As I start this process several things came to mind. First, where are most people mounting the Holley Terminator PCM? Ive seen the glovebox being used however, I wanted to get some more photos and detailed information on what others have done. I will be reusing my heat and AC so I’ll need to work around that.

Second, I believe the rear EVAP solenoid / purge canister is controlled by the factory PCM. I assume the Holley system will no longer operate this. Seeing that this will be an issue, what do most people do in correcting this issue? Can you use an aftermarket charcoal canister in its place even though it’s not an electric unit? I’ve considered replacing the EVAP / Purge solenoid with the one below from Jegs.

Charcoal Canister

Any and all help with both of these things is greatly appreciated!

 

I'm not sure I see the point of installing an aftermarket EVAP system; with the stock PCM deleted the car will never pass an OBD scan emissions test in the first place, so you must either live in an area with no testing or the car is old enough to be exempted in your state - either way, emissions stuff is irrelevant if you're moving away from the factory PCM.

 

The car is old enough now for where I live I don’t have to worry about emissions. Mostly concerned with the ability to fill it up still with no issues and that a large amount of pressure doesn’t build during operation which I believe is what the EVAP purge solenoid does.

 

your fuel tank is vented to the cap area, so you wont have pressure build-up unless you pinch or plug the vent line from the tank.

 

EVAP is just for emissions compliance. The tank can simply be vented to the atmosphere. As mentioned above, the stock tank already has a vent system (vent solenoid near the tank defaults to open) that sends vapor to the canister; purge system is only active when the engine is running and vapors can be burned, but you can just delete the canister & purge system and the tank will still vent.

 

If I delete it, it will vent to atmosphere correct? Meaning the gas smell would be far more prevalent in the garage? In that case, I was going to add the charcoal canister I posted the link to so I could eliminate that issue.

 

My '98 is an all-stock show car so everything with EVAP is still intact. However, my '71 (which actually did have an early EVAP system from the factory) has long since been relieved of this system. The tank on that one vents to the atmosphere (as do the fuel bowls on the carb, since it's an open air cleaner assembly). I honestly don't notice any significant fuel smell in the garage in general, even in the summer heat, unless I'm under the car directly near where the tank vents or my nose is right next to the air cleaner in the engine bay. I'm pretty sensitive to smells, so I would notice if it was a significant issue.