Re: '47 Clipper Deluxe backfiring power loss

Posted by Dave Kenney On 2009/11/27 8:28:03

Was the car running OK before you changed the plugs etc.? If not then I suspect that it may be a coil going bad when warmed up. It could also be a short or open circuit in the primary ignition wire which could cause intermittent coil failure but why when only warm? A bad condensor will also cause a backfire so possible change that also.
Another cause of a backfire could be fuel starvation but since the problem occurs after the engine is warm I suspect the coil. The sediment bowl should be full or at least almost full at all times so a check of fuel pump pressure is in order or the filter element might be plugged or there is something in the gas tank or line restricting flow. I amsure others will chime in with other ideas.