Drivetrain Changed Bypass Valve
#26
You are right !!!
My boost (although it took longer to get there than I remembered) was the same just shy of 15 lbs
But my vacuum right before the BPV change was never more than about 4 lbs
What ever happened to my orig BPV would not allow a adjustment that would have the butterfly fully closed.
After= Boost still just under 15 lbs of boost (I do think quicker to get there)
and vacuum now 12 at idle and almost 20 on coast down
#27
You are right !!!
My boost (although it took longer to get there than I remembered) was the same just shy of 15 lbs
But my vacuum right before the BPV change was never more than about 4 lbs
What ever happened to my orig BPV would not allow a adjustment that would have the butterfly fully closed.
After= Boost still just under 15 lbs of boost (I do think quicker to get there)
and vacuum now 12 at idle and almost 20 on coast down
My boost (although it took longer to get there than I remembered) was the same just shy of 15 lbs
But my vacuum right before the BPV change was never more than about 4 lbs
What ever happened to my orig BPV would not allow a adjustment that would have the butterfly fully closed.
After= Boost still just under 15 lbs of boost (I do think quicker to get there)
and vacuum now 12 at idle and almost 20 on coast down
#29
#30
i personally wouldn't think so as your cylinders determine vacuum. so likely you'd test vacuum at the intake manifold. the bypass would be pulled open by this vacuum.
#32
The reason I asked is that happened to me last weekend. Idle vacuum changed from 18 in to 4 in hg and max boost peaked at 5 psi (was 15 psi). I am still trying to determine the cause and thought it might be the BPV.
#34
Those are exactly the sypmtoms....
Matt
#35
You were right, it was a leak. The hose to the fuel pressure regulator was off. That was a much easier fix than swapping the BPV. All is good now.
#36
i see where y'all are goin' with this but if vacuum pulls the bypass open isn't it a mute point once it starts to open ?
#38
see this is where i get off. the hole in the tube for the vacuum sorce on the bypass valve is below the butterfly of same when mounted; so it's vacuum sorce toopen is all the way round through the s/c . so this coming summer i'm taking the front end off cause of an oil leak and you can bet some gaskets will be getting replased as well as a thorough inspection of all the mating surfaces of everything on this path. so how much should it be open at idle ? maybe this is the sorce of alot of the troubles; it's not very consistant.
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iamcamkeenan
R50/R53 :: Hatch Talk (2002-2006)
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08-10-2015 03:31 PM