Question about 1992 Chevrolet K1500

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1992 chevy K1500 series 350 5.7L ex-cab 4X4 Thank you for the information. your very well informed. However since the last time I spoke to you the truck has been running fine up until last week. I still think it is an oxygen/fuel sensor of some kind. This would also cause poor performance in this truck such as bad fuel consumption, lack of power.The trucks service engine light came on today first thing this morning and the truck was running funny. - shut the truck off once I got to my project site - turned it back on later and no more idot light and the truck was running okay as well. Checked the check engine code it flashed 12 twice than flashed 42 any idea what code 42 is? As far as the oil leak, the oil pan gasket needs replacing. Please help. Thank you. Theresa

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Obviously the 12 means that the system is functioning correctly Code 42 is electronic spark timing (EST) circuit grounded. Wiring issue from the harness to dist.

Posted on Sep 21, 2008

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