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Its pretty straight forward, one bolt holding it down, electrical connection, and a hose. Its under the engine cover next to the plenum. Here is a picture:
If your purge valve/solenoid is failing, chances are you will need a new EVAP Carbon Canister as well. As the canister gets old the charcoal (carbon) starts to break down and bits gets sucked and stuck in the valve when the gases are purged from the canister on start up and acceleration. If you take the solenoid off and tap it on the ground you will probably see tiny bits of carbon fall out. This is a sure sign that you need a new canister ...Just replacing the solenoid valve won't help as it will only get clogged again by these bits of carbon. GM located most canisters in the rear wheel well under the wheel well lining. Not too sure of your model but check a Manuel. You must also blow out the line before connecting it to the new canister as bits of carbon can be still in the line and contaminate the new purge valve.
On the side of the intake manifold follow the plastic vent line from the canister to the intake manifold. It usually is within a few inches of the test port which has a green cover on it.
My 99 Deville has purge valve right on top of engine (Northstar) just rearward of throttle body. Looks like a black almost round cylinder the size of a roll of quarters with a wire connector out the back. Easy to remove and replace, and a common part to fail and set emission code.
If you are sure it's bad, buy one and you should be able to find the old one by looking at the new part.
Raise and support vehicle.• Remove right rear wheel housing liner, see Repair Manual Body Exterior Group 66 - Exterior equipment, "Rear wheel housing liner, removing and installing" in ElsaWeb.• Disconnect T-3 electrical connector at Leak Detection Pump (LDP).• Disconnect EVAP purge line, EVAP vacuum Line and EVAP vent line from EVAP canister.
SOUND LIKE FUEL PUMP GOING BAD.BUT CHECK THE EVAP CHARCOAL CANISTER FILTER IF GAS SOAKED REPLACE IT REPLACE GAS CAP MAKE SURE GAS CAP IS THE PRESSURE VACUUM TYPE.ALSO CHECK VACUUM PURGE VALVE VACUUM HOSE TO CARBURETOR AND CHECK VACUUM HOSE TO CHARCOAL CANISTER FOR BLOCKAGE RESTRICTION OR BROKEN AND MISSING.
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