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Chevy Blazer S-10

What is a Code 42 on a 1992 S-10 Blazer?

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2004-04-14 11:46:49
2004-04-14 11:46:49

Greetings, A code 42 indicates that the electronic spark timing bypass circuit or the electronic spark timing circuit is either open or shorted. A malfunctioning HEI module can cause this.

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