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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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What is a code 42 on a 1986 Chevy blazer s10 how do you cure it?
C3I ELECTRONIC SPARK TIMING (EST) FAILURE is code 42 timing can be off by a lot of factors check vacume leaks plugs wires etc..
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code 42 is for the electronic spark timing circuit -computer timing control.If you need the diagnostic flow chart to test this email me at chickenbones62@yahoo.com and i will email it to you good luck with your repair!
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