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There are a couple of things that might cause a backfire and NONE of them have any relation to electricity:
1. Engine timing, the relationship of the CAM and the CRANK shaft. IF a valve is open when the engine cylinder fires then the resulting action is a backfire.
2.Cylinder misfire: There is one cylinder exhausting unfired fuel to the exhaust manifold and if he manifold is hot enough, the fuel mixture ignites.
Did you change the distributor? Could have put it back in the wrong direction or forward too much on the timing notch or put too plug wires on the wrong post..... It definitely sounds like a timing issue and the back fire sounds like the plug is firing the cylinder on the intake stroke.... if you keep at it you will blow your muffler off or start a fire. Look up the firing sequence for your year and make of car to be sure
muffler explosion
#1 reason , EFI running rich as a pig (CEL glowing and warning)
and exhaust cracks, (adds air )
air + fuel = muffler explosion and can blow the whole thing to H3LL
pipes blast off. car.
It's not possible to pinpoint, with just online info, what is causing the backfire, but if it blew your muffler open, the engine is definitely dumping raw fuel into the exhaust. Look into what can cause excessive fuel to be dumped into the exhaust and you may find the cause of your problem.
White smoke....Means a Blown Head gasket.. Now its not bad enough to stop the vehicle from running but its bad enough, to blow out white smoke..now sooner or later it will stop completly, but you dont want to warp the cylinder heads too bad, then you will have to replace them also, so you might want to fix this problem as soon as possible...and the muffler keeps going bad, becasue it is filling up with coolant/ or too much water, which it is not designed to do..You also maybe doing damage to your cat. converters also...so be careful....And Goodluck, and keep me posted...
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