auto choke

[jeffdub]

just looking at my carb on my 1.9 wbx and as i look down the flap is vertical does this mean its open or closed / forgive my ignorance im new to carbs thanks jeff

[Ian Hulley]

The choke is 'On' when the butterfly valve is shut, this restricts the flow of air allowing the engine to run on a much richer mixture. The flap is operated by a coiled bi-metal strip which (once set correctly) gradually unwinds as the coolant temperature increases, opening the valve and allowing more air through to lean the mixture ... shown by the receeding engine revs.

Ian

[jeffdub]

thanks ian when i start the van from cold the valve is shut but it struggles to tick over but if i blip the accelerator the choke cuts in ive just tried adjusting it as per the wiki by undoing the 3 screws and rotating it a bit but it made no difference

[Ian Hulley]

Do you 'set' the choke ? single press of the pedal BEFORE starting up ?

[jeffdub]

yes ian ive just tried it again and although cold its ticking over ok ! maybe something was stuck and my fiddling has freed it ?

[Ian Hulley]