2.8 Variable Volume Intake Manifold Test
01-30-2015, 10:39 AM
#1
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2.8 Variable Volume Intake Manifold Test
Does anyone know how to test if the variable volume intake feature on the 2.8 is working properly? Its the diaphram/lever contraption under the coil packs.
01-30-2015, 12:26 PM
#2
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A vacuum solenoid is actuated at 3200 rpm maybe a bit higher to advance the manifold change over valve or tuning spool, have someone rev up the engine and watch the vac actuator lever move.
01-30-2015, 04:21 PM
#3
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Won't VCDS actuate it at engine idle?
I don't know for sure, but it seems that's one way to see if it works. Whether it works at 3200 is another question, perhaps by logging while driving?
01-30-2015, 06:30 PM
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The rpm +3000 worked. It actuated. I'm unclear of the actual rpm value that initiated the vac, but it was above 3 below 4. I tested, as jcman suggested, on startup a few times without any reaction from the vac solenoid. I was trying to keep everything cold while testing. It turns out, after it ran for a few minutes, the vac solenoid would initiate. Went back and tried it on a cold start, and there was nothing. Few minutes later, actuated fine. The word of the day is actuate, and initiate.
01-31-2015, 06:33 AM
#5
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Good on you! Glad to hear it worked after a few minutes.
The rpm +3000 worked. It actuated. I'm unclear of the actual rpm value that initiated the vac, but it was above 3 below 4. I tested, as jcman suggested, on startup a few times without any reaction from the vac solenoid. I was trying to keep everything cold while testing. It turns out, after it ran for a few minutes, the vac solenoid would initiate. Went back and tried it on a cold start, and there was nothing. Few minutes later, actuated fine. The word of the day is actuate, and initiate.
01-31-2015, 03:40 PM
#6
AudiWorld Super User
A reaction apon an action
The rpm +3000 worked. It actuated. I'm unclear of the actual rpm value that initiated the vac, but it was above 3 below 4. I tested, as jcman suggested, on startup a few times without any reaction from the vac solenoid. I was trying to keep everything cold while testing. It turns out, after it ran for a few minutes, the vac solenoid would initiate. Went back and tried it on a cold start, and there was nothing. Few minutes later, actuated fine. The word of the day is actuate, and initiate.
Those words of the day must be in a mechanical order too.
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