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...ecked the auto chokes are off, but idle speed is way too fast. pulling the vacuum pipe off the advance unit on the distributor the idle drops to normal, put ...connected properly? Blocked at either end, carb orifice for hoses blocked? Hoses leaking? ...

...y [[General HD vacuum cleaner|HD vac-cleaner]], with some step-down rubber hoses taped onto wedge-tool can often get access, to suck a lot of (dry) matter o ...

...(not sure if this is the correct term for it), is the bit that has coolant hoses connected. Remove the three screws that hold the autochoke body to the carb 6) remove the two vacuum pipes at the front (front of van) bottom of the carb. ...

...or unleaded on a DJ and disconnect the vacuum advance and retard and block hoses to time. ...

...vac/adv. and cent. unit 'seem' to be working OK, e.g. no obvious leaks in hoses, blockages at pressure tappings, and no gummed up dizzy. Because unless som Static timing 5 degrees ATDC +/- 1 degree (also at 900 rpm with vac hoses disconnected and ISU plugs disconnected from unit and plugged into each oth ...

...flanges, inlet manifold/head flanges/gaskets, perforated manifold, vacuum hoses on carb or manifold. Air filter to carb leak, less severe symptons Check all vacuum and breather hoses to manifold or carb. Fix or block-off as appropriate to function and condit ...

...ood all round and economical performance with a stock dizzy. VW didn't fit vacuum advance and retard units for fun. The dizzy also plays a part in emmissions '''HarryMann:''' This is how I see vacuum timing working, across most full vacuum advance/retard systems ...

**[[petrol engines aircooled Ignition 01|Ignition timing esp. Vac adv/ret hoses]] **[[Fuel system - 1.9 Fuel hoses|Replacing 1.9 DG Fuel hoses]] ...