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Hi I have a 1974 hillman avenger 1600. It misses when cruising at around 100km/h, particuarly giong uphill. I think its because the valve on no1 cylinder tightens up, as I have altered the clearance in the past to solve the problem. Could it be tightening up because of a worn valve seat? And if so could a new valve seat be pressed in? Sam

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Misfire when going up hill or under load is more likely to be a plug or plug lead. Valve clearances only change slightly when hot but not under load so if it only misfires going up hill its likely to be electrical or fuel starvation, check the fuel filter also

Posted on Aug 29, 2010


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