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My general understanding of exhaust CO and unburnt HC levels is that the CO level depends on the mixture, and the HC level is an indication of the state of the engine - i.e. valves, compression and ignition system. It can sometimes be worthwhile in our positive crankcase ventilation engines to disconnect the breather hose to prevent fuel and oil vapours getting back into the system and resulting in higher HC figures. Is there any chance the fuel pump is allowing fuel into the sump? Isn't this the <20mpg (IMP) car? Sorry to hear current reasoning is that resonance doesn't come into play with coil and capacitor in ignition systems, since it is a happy consequence that maximum power is available in the system if so. It also suggests why different coils often come with problems of points getting eroded more readily. Still, you can often see reasons for a theory being correct if you want it to be correct! Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/