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<x-charset iso-8859-1>I checked the VW factory manual and it certainly says 1.5 turns out to start. Maybe float chamber level is a bit too low or there's a slight blockage in a fuel drilling. Can you check the CO level? I find about 3% CO works OK on my Twin Carb. Could be yours is fine and there's air getting in - at tick-over speed there is quite a big suction in the manifold to screw up the mixture. 20 mp(imp)g seems a bit low, but maybe not far off for slow cold short journeys. Timing and valves are also important - are these OK on yours, Mark? Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ----- Original Message ----- From: "Mark Seaton @ Mo-Sys" <markse@mo-sys.com> To: "Type 3 Mailing List" <type3@vwtype3.org> Sent: Tuesday, January 22, 2002 2:05 PM Subject: [T3] Idle mixture adjustment > > Hi Listees, > In my Haynes manual and in the VW "Look Listen and do it Better" leaflet, > (and I've heard it elsewhere) it says that I should wind the idle mixture > screw out 1.5 turns, then screw it in until the revs drop, then back it out > till the engine runs good again , then back it out a further 1/4 to 1/2 > turns for perfect mixture control. On my carbs the engine won't run right > until the screws are turned out 2.5- 3.5 turns! Is this an indication that I > have very warn and leaky throttle body/shaft? or is it possible that the > later carbs had a finer screw that just needs more turns? Should I worry? I > am still getting pretty lousy MPG despite the engine running a lot smoother > and healthier. What do other people get in town driving. I am lucky to get > 20mp(UK)g which seems pretty bad. Haven't been on any long motorway drives > yet to check the mileage without constant stop-starting. Maybe I should. > Thanks > > Mark Seaton > Orange '73 1600TA London > > > ------------------------------------------------------------------- > Search old messages on the Web! Visit http://www.vwtype3.org/list/ > > > </x-charset>