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TROUBLESHOOTING

1953-1960 Classic Car Engines Troubleshooting Guide: Engine Misfires At High Speeds

Things to Look For:

  1. Hot spark plugs. Change to colder type but note that a hot plug may be due to loose installation or lack of a plug gasket (if gasket is called for).
  2. Ignition point gap much too wide.
  3. Breaker arm binding or sticking.
  4. Breaker arm spring weak.
  5. Sticking engine valves.
  6. Valve springs too weak to close valves promptly.
  7. Valve springs broken.
  8. Valve springs shimmy.
  9. Intermittent delivery of fuel to carburetor so that momentarily the mixture is too weak for combustion.
  10. Mild vapor lock.
  11. Weak spark.
  12. Exhaust manifold clogged with carbon.
  13. Exhaust manifold, muffler or tail pipe restricted.
  14. Improper ignition timing.
  15. Centrifugal advance not functioning properly.
  16. Manifold heater valve held closed.
  17. Dirty carburetor air cleaner.
  18. Choke valve not completely open.
  19. Carburetor throttle lever loose on shaft.
  20. Improper fuel pump operation.
  21. Preignition.
  22. Incorrect valve timing.
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The Complete Guide to Troubleshooting 1953-1960 Era American Classic Car Engines

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