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What I don't understand is why does it have a butterfly ? what does it do ?
Surely the engine needs maximum airflow on all occasions other than braking and shutting down.
Can't see how a butterfly/air flow restriction would help warm up either but eager to know. Seems more like an air brake to me.
Might re fit mine without the butterfly and try that as I'm sure the butterfly was causing me problems. I also don't like that am mount of restriction on the intake side. Seems a stupid design to me. Why put a 40% restriction in line just before the inlet manifold.
Are there any sensors past the egr or in the inlet manifold ?
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