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I had this problem when I moved from Dallas (500 ft above sea level) to my current home in Colorado (6500 ft above sea level). My solution involved switching out air and fuel jets, however. Doug > -----Original Message----- > From: Dave Hall [SMTP:dave@hallvw.clara.co.uk] > Sent: Wednesday, July 16, 2003 11:53 AM > To: type3@vwtype3.org > Subject: Re: [T3] Spin > > The equation seems to be"more advanced timing = more power but > > more popping". Last time I only heard one pop during the entire journey, > but > > it felt more sluggish. > > My twin carb has returned from Europe having driven really nicely, but in > the > very hot weather it has begun to idle rather slowly and respond less well > to the > accelerator, taking more time to build up rpm for pulling away. > > It turned out to be the left mixture screw that had unscrewed a turn or > so. > First suspicion was due to the very smelly exhaust, but the CO meter > confirmed > it. Screwing in the control increased the idle rpm back to normal and the > accelerator response is fine again. > > Maybe you've got too rich a mixture, which is then popping in the exhaust, > or > maybe there's a misfire with too early a spark that leaves unburnt mixture > to > pop. > A little more advance usually produces better response, but it is also > more > likely to cause piston damage over a period of time. > > Dave. > UK VW Type 3 & 4 Club > http://www.hallvw.clara.co.uk/ > ------ > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org