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Problem in timing

I set my dwell angle and timing on my 350 chev motor in my boat correctly but when i put the foot down it back fires i check with the timing light it seems to be jumping from advance to ****** by 2-3 degrees while it idles

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On the distributor there is 2 types of advance.Vacuum and mechanical.The vacuum type has the mushroomed shaped bit screwed to the side of the dizzy.you have to pull the small vacuum hose off when you set the timing.Using your timing light,bring the revs up.The timing should not move.Put the small vac. hose on and off and the timing should move up and down.If its a mechanical advance,there is springs inside the dizzy that hold small weights.As the dizzy spins,centrifical force moves the weights outwards creating advance.Check the springs are in place.If you have access to one,try a another dizzy to satisfy your problem.A good shop will have a dizzy tester they can put yours on to check all these thigs.Hope this helps

Posted on Sep 26, 2009

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