Why Car Engine Cranks, but Backfires
Car Initial test
Check whether the distributor housing moves within its clamp. If it is loose, the ignition timing is probably incorrect.
Car Reset Ignition Timing
If the test shows that the distributor housing is loose, it should not be secured before the timing is reset. Try starting the engine with the distributor in different positions but do not turn it beyond the slackness of spark plug wires.
Once the engine fires secure the clamp at the base of the distributor housing.
Car Cracked Distributor Cap
If the initial test shows that the distributor housing is secure the trouble is probably due to a cracked distributor cap. If a replacement cap is not available try locating the crack and then, with the utmost care, make a small hole through it with a knife, nail file or drill.
The air gap you have made will prevent the spark arcing along the crack. If you have done this properly the engine should start and run normally.
NOTE: An easy way to trace a crack is to secure a length of wire to a screwdriver shaft. Earth one end on the engine block and, holding the screwdriver by its handle while the engine is idling, use the point of the shaft to probe between the terminal posts and the cap.
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