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On 4 Nov 2002, at 14:34, Mark Seaton wrote: > On 3 Nov 2002, Jim Adney replied: > > What is the spec here? HCs would be high if it was running rich. > > I don't know what the spec is but a year ago the HCs were much higher and > the tester said it was because it was running too lean!? HCs get high > because the fuel isn't burning properly don't they? I certainly can't wind > in the idle jet at the moment without the engine starting to miss and hunt. > Perhaps I have more wear in the engine than I want to acknowlege. You make a good point here. There's more than one way to get high HCs. The too rich one is obvious, but running too lean will cause the same thing just because you're not getting good combustion. Engine wear and oil burning is another source. Finally, this can also happen if the ignition system is not working right. If you have cylinders which are "missing" then these gasses get passed on as high HCs. The easy way to check the mechanical advance is to just grab the rotor and twist it CW. It should turn smoothly and then snap back on its own when released. There will be a small amount of free play in the rotation which is due to backlash between the dist and the drive gear. This is normal and causes no problem. - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/