2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 196Get this manual

2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 196

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THEORY OF OPERATION
The injection system employs 120 synchronous (batch) injection method which groups cylinders #1 and #4, and cylinders #2 and #5, and cylinders #3 and #6 In order to make corr