No Spark


Old 01-19-05, 08:08 PM
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No Spark

1999 Chevy Blazer. 4.3

No spark, has pulses at crank sensor, has spark at coil wire,but No spark at plug wires. Always had trouble in damp weather. Cap and rotor look good, but will change tomorrow. Any Suggestions would be great. Thanks.
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Old 01-19-05, 08:39 PM
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I assume you have no spark at any plug wire. If so look for a crack or carbon track on the bottom center of the rotor that is taking the spark to ground at the distributor shaft.
Old 01-19-05, 08:53 PM
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If it has spark from the coil into the distributor but not out then it has to be in the cap or rotor. GM's hei (vey hot)system sometimes will burn a hole through the rotor under the tab and ground out the spark into the shaft.
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