Inboard Motors Mercury Mercruiser 1964-1991 service manual, Page 201Get this manual
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4- 12 TROUBLESHQOTING EFI If prublem is withor npcraion, the dcterrninatioi mustthe problem ig in the ignition fuel is fault'l'hc first and cabicst test to igi1ifii311 proh1cm is test as outlined in C