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Old 08-20-2009, 07:10 PM   #1
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Anyone know how to test?

Any one know how to test the butterfly solenoid or the secondary, whatever you want to call it? Does it get 12volts from the ecu at 3k to open it or is it supposed to get 12 volts at idle to close it? I dontthink mine is working on my 3.4. I know if you rev it over 3k it is supposed to open. But does that work at idle or only at a load? If you have an extra solenoid too let me know. I think mine might be shot.

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Old 08-21-2009, 07:13 AM   #2
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JAY sometimes i think i have that problem on my 3.6L. Sometimes when im driving i can really hear the butterfly valves open up and the car literally screams and sometimes i dont get that extra "push" or sound from the valves. Mine turns on about 70% of the time when i'm on it, does yours seem to come on and off?
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Old 08-21-2009, 08:29 AM   #3
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The solenoid always has 12V. The ecu sends a ground signal to activate the solenoid. If you take the solenoid and blow or suck on the horizontal fitting, it should be closed without power. When activated it should pass air through the vertical fitting thus when installed in the car the two fittings become connected applying vacuum to the butterfly actuating plunger.

If you rev the car over ~3k rpm and the throttle is open >30% it actuates. Thus if you punch the throttle while stationary you should see the plunger on the secondary plenum actuate.


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