Anyone knows when the Purge Control Solenoid Valve opens and closes ?

in what conditions ?
is the engine temperature ?

 

Whenever engine coolant temp is below 147°-149°, the purge valve cuts vacuum to the charcoal canister.

 

@slomofo

so, with the vacuum cut theres no fuel vapors from canister to TB ?

more than 150ºF the canister start to send the fuel vapors to TB ?

 

thats what what somofo said. at 150ºF and up, the valve opens applying vacuum to the canister and sucking vapors out of it.

 

thanks a lot,

since i live in a hot country and on several minutes my engine is 149.
i did this

theres no problem right ?

i have a b16a1 OBD0 engine with p28 ecu

 

^That is how the JDM Type-R's are setup from the factory. It should work fine. I have my 97 B18C hooked up that way in my 94 Civic and works fine. I left the Purge solenoid plugged into the harness so I wouldn't throw a Check Engine Light. It is no longer hooked up to any vacuum lines. I think the JDM EG's don't even have that valve on charcoal can at all. Just a in & out line for the fumes.



BTW: These US OBD1 and older EVAP systems are not sealed, and tube to the throttle body only offers the most minimal of venture effect (not true manifold vacuum). If you don't believe me, unhook the hose from the throttle body and stick your finger over the nipple (almost no suction). These systems can emit considerable fumes to the atmosphere in the right conditions. This happens to me in both cars (94 Civic & 89 CRX) if it's over 100* outside and I runt he AC for extended periods. What happens is the heat builds too much pressure inside the fuel tank and the 2-way valve releases that excess pressure into the charcoal canister. The small amount of venturi effect at the throttle-body gets surpassed by the pressure relief from the tank, and the canister overflows with fumes. The overflow then heads out the fresh-air tube on the bottom of the charcoal canister. You can actually see them billowing out of the fresh air tube splash guard underneath the passengers floorboard.

Apparently this is normal, and the reason 96+ in the US required a completely sealed system with pressure tests by the ECU. You should NOT see actual wet fuel, just wafty fumes.

 

thanks a lot to all,
i too remove my Purge Control Solenoid Valve

heres the pic

 

And here is a picture of where the Type-R manifold directly connects to the charcoal canister valve:

 

thanks,
a friend of mine dont have the canister OUT connected, this will damage the canister ?

 

^That won't damage the canister, it just causes your car to smell like nasty gasoline fumes when vapor pressure pushes it's way out of that bottom vent tube I pictured up top. There is really no reason not to hook this thing up. It doesn't impede performance one bit. It just keeps your car form stinking.

 

ok, thanks a lot

are you Portuguese ? "impede" is a portuguese word

 

I believe it's latin. But no I'm American. :D

 

Portuguese is a latin language

 

Ah ha!

 

where can i buy a that canister ?

 

x2! My '94 Civic Si has a canister that requires 3 connections, one from the tank, one to purge, and one for a vacuum signal that opens to purge.

I have it hooked up as best I can, but when it gets hot, the car stumbles at idle. I have an OBD2 B18C1 in my OBD1 body. This is the only part of the swap I have not gotten to work well.