Originally posted by wishbone
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Originally posted by wishbone
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Originally posted by wishbone
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This has been bugging me, so after some more thought and a better look at the venturi and manifold from a 2.4, it seems that I have been looking at things the wrong way.
The EGR it seems, has a direct path to intake manifold regardless of butterfly position and the amount of EGR introduced is governed by small butterfly position and of course, also depending on if the EGR valve itself is open. As small butterfly closes it allows less air to enter the intake so engine has to draw in exhaust gasses instead.
So cold test as in the manual says no vacuum to either which is correct. The 2.4 does the same.
Hot test says no vacuum to either at idle. This still has me stumped as my 2.4 gets vacuum to bottom port at idle when engine is hot. Small butterfly is partially closed. Also when off idle there is no vacuum to either port on mine (butterfly fully open) whereas the 3Ltr manual suggests there is vacuum to both off idle.
I need a stiff drink. Anyone want to shout as I have none here?
Nev
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