Don't know the name of it John, the one way valve in the Ur is fitted in a rubber hose that connects to the top of the cam box /cover, from looking at photos of the NG engine bay online I don't think it has one, but from what was said by Graeme after blanking of the crank case breather the car starts fine, in my mind with the breather connected the engine in starting mode it is drawing air from the crank case rather than through air meter flap in turn the flap will not rise as far as it would to let the correct amount of fuel in to the cylinders, there for run like a bag of spanners, also said if there is some sort of one way air valve it may be connected round the wrong way of not acting like a one way valve (f**k*d), they also may look like a pipe connector with different colored ends, I think I am correct in saying Graeme has had this problem from day one and it may be a very simple fix as most of these starting / running problems are.
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