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GM (Buick) 252 (4.1 L) V6 engine firing order

Electrical Motor > firing Orders firing Orders to avoid confusion, always replace spark plugs and wires one at a time. Replace spark plugs and wires one at a time will help prevent incorrect wire routing or cross-firing due to an incorrect firing order. If more than one thread is one at a time, you must be disconnected all cables to ensure correct installation label. Also, disconnect the cables, compare the order firing and routing to these diagrams and note any differences for installation purposes. This will help ensure that the wires are installed correctly.

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