Alright, another question about the EVAP
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Captain
Joined: Dec 2008
Posts: 578
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From: New Jersey
the canister i found on some mopar website i forget the name but i cant find the thing anywhere around me i actually cut the top off and took out the foam filter and sealed the hole, refilled it with the same grain size (if you will) charcoal that was in it from petsmart lol made a new top for it out of a piece of plastic sealed it with some gray rtv and fit it all together real nice stuck it back on there and its good lol. but for the bullsh*t i did to reseal this thing and the insides screw that ill just buy a new one next time lol
I am just now getting around to looking into the schematics for this system. It is not as simple as I thought it was. Simple in schematic layout yes, but, in function, it's doing a whole lot more than I was aware of.
This system can cause symptoms of stalling out at around highway speeds along with misses in the firing sequence. Turning hard left or right results in stalls. This is just what I found after 10 minutes so, I am guessing that there's a whole lot more than just containing vapors here. Will do a complete run through on Saturday on this entire system to get it down.
To check your solenoid valve it's one of those things that is done by placing your hand on the solenoid pump to start.
The pump is comprised of a three port solenoid, pump that has a switch, a couple of check valves, some spring diaphragm mechanism inside the canister which acts as a vent valve.
Anyway, when started cold- the solenoid is charged up momentarily. This draws air into the pump cavity and closes the vent seal. It remains closed while cycling however, when the initial charging period is over, it is deenergized which allows atmospheric pressure to fill the cavity.
When this cycle is repeated, this is what creates the on / off pulsating vibration which can be felt by hand. This is how you know it's working.
There's two modes of operation:
MODE 1: Pump mode. The pump is cycled at a fixed rate. This achieves rapid pressure build up in a short amount of time.
MODE 2: Test mode. This is when the solenoid is energized with a fixed duration pulse.
When the pump starts, the cycle rate is very rapid. As it pressurizes the system, this rate will decrease over time. If there's no leak, the pump will quit. If there's a leak, the test is aborted / terminated.
If no leak: the purge motor is run. If the cycle rate increases due to the increased flow of the purge system, the test passes and no code is thrown.
If it fails: P0442 and P0455 codes will be generated.
More to come later this weekend on this system.
This system can cause symptoms of stalling out at around highway speeds along with misses in the firing sequence. Turning hard left or right results in stalls. This is just what I found after 10 minutes so, I am guessing that there's a whole lot more than just containing vapors here. Will do a complete run through on Saturday on this entire system to get it down.
To check your solenoid valve it's one of those things that is done by placing your hand on the solenoid pump to start.
The pump is comprised of a three port solenoid, pump that has a switch, a couple of check valves, some spring diaphragm mechanism inside the canister which acts as a vent valve.
Anyway, when started cold- the solenoid is charged up momentarily. This draws air into the pump cavity and closes the vent seal. It remains closed while cycling however, when the initial charging period is over, it is deenergized which allows atmospheric pressure to fill the cavity.
When this cycle is repeated, this is what creates the on / off pulsating vibration which can be felt by hand. This is how you know it's working.
There's two modes of operation:
MODE 1: Pump mode. The pump is cycled at a fixed rate. This achieves rapid pressure build up in a short amount of time.
MODE 2: Test mode. This is when the solenoid is energized with a fixed duration pulse.
When the pump starts, the cycle rate is very rapid. As it pressurizes the system, this rate will decrease over time. If there's no leak, the pump will quit. If there's a leak, the test is aborted / terminated.
If no leak: the purge motor is run. If the cycle rate increases due to the increased flow of the purge system, the test passes and no code is thrown.
If it fails: P0442 and P0455 codes will be generated.
More to come later this weekend on this system.
