Short answer is no.
Here is the long answer: This is only testing to find out if the purge is open to the intake manifold to allow the vacuum from the engine to pull in the vapor.
What if the purge is stuck open which is the normal failure? This will allow vacuum all the time which means it is pulling fuel vapor when it should not, and this will cause hesitation or stalling because it throws off the air fuel mixture.
So doing this test, that just proves that it is not stuck closed but that again proves another issue. What if they test it when the valve is closed? Then they are going to suspect that the solenoid is stuck closed and replace it.
So, I say all this to say, this test is one of those tests that gets many vehicle owners frustrated because they assume it is good info, but it really doesn't tell them anything because the only way it is good info is if they know what the purge is supposed to be doing at the time, they are testing it.
So, the only way this is a definitive test is if they know what position the purge is supposed to be in, open or closed, and test it this way in both position and see that it is open and closed.
The proper way to test this is attached below. I would start with checking for codes as this is monitored and if there are no codes then it may be fine but should still be monitored as shown below.
Let me know what questions you have. Thanks
Images (Click to make bigger)
Sunday, October 3rd, 2021 AT 7:36 AM