1948 Packard 22nd Series Six Touring Sedan Backfiring and lack of power

Posted by Michael Evans On 2012/9/4 0:45:20

Hi

Recently had a backfire that broke the starter motor front - that has now been specialist welded and is back on the car and working - however once rolling I'm now experiencing a vibration at about 25mph and a distinct lack of power.

The engine's timing was we thought correct before the backfire - could it be that the backfire upset the timing ?
or is it the case that the timing was NOT set-up correctly and so caused the backfire ?

I also understand that improper or damaged ignition wiring and/or spark plugs can cause a backfire but all those components are new.

I understand that low fuel pressure can also cause backfiring but again the fuel pump seems to be giving the correct pressure but how can I test that ?

Any help greatly appreciated (as usual !!)

Best regards Michael