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1994 2.3L Engine runs better with diagnostic test jumper installed - why?
From previous thread: 1994 2.3L 5 speed base model Mazda B2300. Engine ran ROUGH, no power, backfired, bogged down etc. Replaced Fuel pump assy, cleaned tank, new fuel filter. Cleared codes. Added SeaFoam cleaner to tank of fresh gas. codes 111,111 and that's all. Looks like only "pass"...
