1953-1960 Classic Car Engines Troubleshooting Guide: Backfire
Things to Look For:
Backfiring is a subdued explosion in the intake manifold. Causes are:
- Lean mixture (often due to dirt or water in fuel).
- Engine cold and choke too lean
- Leaky or sticking intake valve or weak or broken intake valve spring.
- Leakage of current across distributor cap may cause backfire by enabling spark to occur in a cylinder which is on its intake stroke. Two mixed-up spark plug wires may also cause this trouble.
- Popping back is synonymous with backfire.
The Complete Guide to Troubleshooting 1953-1960 Era American Classic Car Engines