the hissing could be the key, could it be a blocked exhaust or cats , i was thinking boost leak but that doesnt normally make them white smoke,
does it have a inlet manifold butterfly ? could it be closing at idle
Like you say the exhaust pressure does sound excessive , the pressure sensor on the 270 cdis is near the egr valve in a metal manifold, it looks like an oil switch but not sure about the v6 cdis.
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