Evap solenoid vacuum test
#1
Evap solenoid vacuum test
I was just trouble shooting a rich fuel condition and ended up doing a vacuum test on the EVAP solenoid.
When I put my vacuum tester on the side which goes to the engine it doesn’t hold any vacuum. Am I right in saying the solenoid is bad?
I do get the rare p0445 and p0455.
When I put my vacuum tester on the side which goes to the engine it doesn’t hold any vacuum. Am I right in saying the solenoid is bad?
I do get the rare p0445 and p0455.
#2
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I can't recall the year, model and engine of your Jag, but in most Jags I believe the carbon canister Purge Valve is normally closed. It receives a constant ignition-switched power supply and the ECM connects it to ground to pulse it open, similar to the manner in which fuel injectors are pulsed open. If your Jag has a Canister Close Valve, it may be normally open, but I'm not sure. Do you know which valve you were testing?
Cheers,
Don
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AD2014 (04-01-2019)
#3
It was the one under the hood behind the throttle body. It has a vacuum from the engine then 2 lines on the other side. It has what looks like a spinning cap on the top. I can get a pic or part number if needed. When I looked at a generic Youtube video they say it should hold vacuum and release it when the solenoid is activated, mine never holds any vacuum.
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#6
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Here are the components from the parts diagram at jaguarclassicparts.com:
I'm fairly certain that the purge valve should be normally closed, but I'm not certain about the canister close valve. It may be normally open. I haven't tested one on an X308.
To give your purge valve a more thorough test, you might try powering it with a 9V battery to see if its state changes to closed.
Cheers,
Don
I'm fairly certain that the purge valve should be normally closed, but I'm not certain about the canister close valve. It may be normally open. I haven't tested one on an X308.
To give your purge valve a more thorough test, you might try powering it with a 9V battery to see if its state changes to closed.
Cheers,
Don
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