Originally Posted by Blk_Bonneville
I was just wondering about the charcoal cannister that is behind the drivers side headlight. Isn't that part of the EGR syetem? I've heard of some people taking theirs out. Is their any pros or advantages to doing that? Or I guess more importantly are there any cons to doing that?
The EGR system recirculates the EXHAUST gases, while this EECS recirculates fuel tank vapors.
Actually it is part of the Evaporative Emission Control System (EECS). It'* purpose is to transfer fuel vapors from the fuel tank to an activated carbon storage canister. this retains the fuel vapors when the vehicle is not operating. When the engine is running, the fuel vapor is purged from the carbon element by intake air flow and consumed in the normal combustion process.
Gasoline vapors from the fuel tank flow into the tube labeled "TANK". These vapors are absorbed into the carbon. The canister is purged when the engine is warm and running above idle speed. Ambient air is allowed into the canister through the filter at the bottom. The air mixes with the vapor and is drawn into the intake manifold to be burned.
The PCM operates a normally closed solinoid valve, which controls vacuum to the purge passage in the charcoal canister. Normally the solinoid is turned "OFF", preventing canister purge. The PCM completes the circuit to ground, turning the solinoid "ON" when the following conditions exist:
Engine is at normal operating temperature.
Engine has been running a specific time.