Diagnosing and correcting a misfire that develops on the track can be far more frustrating than trying to frame out why a car will not start. There are, however, some similarities in the middle of trying to determine the cause of a miss and why a car will not start.
Troubleshooting Ignition Misfires
Troubleshooting misfires can be nerve wracking. Is it certainly ignition linked or is it a fuel question causing the misfire?It may be caused by a mechanical question within the motor or even a cooling principles problem. Other than mentioning the need to check for a blown or leaking head gasket and a bad or low-pressure radiator cap, we will not dwell on the motor internals. However, cooling principles problems are responsible for over 20 percent of "ignition problems."
Fuel principles problems are more often than not attributed to ignition problems. Before delving too deeply into the ignition, rule out any basic fuel principles maladies: A fuel pressure gauge will identify a weak fuel pump, clogged fuel filter, or collapsed fuel line. A warped carburetor base, worn throttle shaft, or other vacuum leaks will show up as a lean condition. A clogged main jet may pass a optical inspection if it is blocked by a piece of sand or clear plastic. If in doubt, use a piece of thin wire to make sure that the jet is not clogged. A blown power valve should be clear from an overly rich exhaust.
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