Question about 2008 Chevrolet Impala
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Posted on Jan 02, 2017
DTC P0446 Evaporative Emission (EVAP) Vent System Performance
The vehicle control module (VCM) monitors the performance of the evaporative emission (EVAP) system by applying a predetermined level of vacuum to the EVAP system and monitors the vacuum decay rate. The VCM sets this diagnostic trouble code (DTC) if the vacuum decay rate is more than a predetermined value. The VCM monitors the amount of vacuum and the amount of pressure in the EVAP system by monitoring the fuel tank pressure sensor. For this DTC, the VCM turns ON both the EVAP purge valve and the EVAP vent valve when the Conditions for Running the DTC are met. This applies an engine vacuum to a closed EVAP system. The VCM turns OFF both the EVAP purge valve and the EVAP vent valve when the system reaches a correct amount of vacuum. The EVAP system should quickly RELEASE the vacuum in the EVAP system with the EVAP purge valve OFF and the EVAP vent valve OFF (open). This test indicates a blocked or restricted EVAP vent path if the EVAP system fails to release the vacuum quickly enough.
Posted on Dec 06, 2008
SOURCE: purge solenoid location
which vehicle are you actually looking for the purge solenoid on? you have 2 vehicles listed in your question. i'll answer both, lol
the locations are described as if you are looking at the engine from the front of the car with hood open.
on the blazer:
it is located on the left side of the intake manifold just under and behind the throttlebody. it is a canister looking device.
on the silverado:
it is located on the intake manifold on the left side in about the same spot as the blazer. providing the silverado has the 5.3 or 5.7 liter engine. if it also has the 4.3 then obviously it will be the same.
hope this helps!
Posted on Feb 17, 2009
The evap purge solenoid is located on the intake manifold. The evap vent valve is located on the side of the fuel tank. If you have a P0449 or P0452 (I think) DTC, it will be the one on the tank that you need to replace.
Posted on Sep 01, 2009
There are two hoses that come from the radiator. The very bottom hose is conneted to the thermostat housing. Looking at the car from the front under the hood just below the first hose is another one same in diameter and there it is two bolts and you done.
Posted on Dec 03, 2010
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