Getting a Code 12 on your GM’s OBD1 scanner? That usually means your ECM isn’t receiving the distributor signal, which affects spark timing and can lead to hard starts. Haynes Manuals give you the step-by-step help you need to trace the problem and get your vehicle back in shape. Don’t guess—get expert instructions at haynes.com. #HaynesManuals #GMFix #HaynesShowsYouHow | Haynes Manuals
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