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76C10Stepside · 05-19-2013, 07:31 PM

OK, I only got code 12 "Diagnostic mode" (flash, pause, flash flash) three times in a row, no other codes. If any other trouble codes had been stored, there would have been other codes after the first or second time flashing the code 12, right?

Will look for a used Haynes manual. Anybody have the 1989 Light Duty Truck Unit Repair Manual published by helminc.com? Is this a valuable book to have for the shadetree S10 mechanic?

05-19-2013, 07:31 PM	#8
76C10Stepside Registered User Join Date: Feb 2012 Location: Olympia, WA Posts: 300	Re: '89 S10 4.3 erratic idle speed OK, I only got code 12 "Diagnostic mode" (flash, pause, flash flash) three times in a row, no other codes. If any other trouble codes had been stored, there would have been other codes after the first or second time flashing the code 12, right? Will look for a used Haynes manual. Anybody have the 1989 Light Duty Truck Unit Repair Manual published by helminc.com? Is this a valuable book to have for the shadetree S10 mechanic?