There seem to be several kits in the market that make it possible to make a carburettor engine pass a 4gastest.

It is a tool consisting of a small control that gets the signal from a lambda sensor and from that lets false air into the intake which makes the engine run on the correct lambda value and makes it possible, with a cat placed, to get 0.5%co

Does anyone know where to buy these kits in the uk./germany? manufacturer name etc.....

i cant find anything about it on the net but I know its used a lot for especially bec cars with post 1996 engines passing sva/iva.

Sounds like a very similar thing used on single point LPG conversions - a lambda sensor controlled stepper valve. Normally controls the flow of gas, but i guess it could also do straight air.

Just about to rip the one off my Vauxhall Omega i'll be breaking shortly...

I thought the lowcost way was fish tank hose and valve from the bubbling selection.

You just adjust to a low CO level at idle prior to test, ie in the morning before, once through chuck it away.

On BEC's you already have balance taps by the inlets so just plug on these.

Regards Mark

Luc Haselier knows where you can get these kits in germany..

I knew it and have found them on the internet..but forgot to write the address down

Will google today and who knows...