GM Cadillac 1967-1989 Repair Guide

FIRING ORDERS

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See Figures 1, 2, 3, and 4

To avoid confusion, always replace spark plugs and wires one at a time.

Replacing spark plugs and wires one at a time will help prevent incorrect wire routing or cross-firing resulting from an incorrect firing order. If more than one wire is to be disconnected at a single time, be sure to tag all of the cables to assure proper installation. Also, be disconnecting the cables, compare the firing order and routing to these diagrams and note any differences for installation purposes. This will help assure the wires are properly installed.



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Fig. Fig. 1: GM (Cadillac) 250 (4.1L) V8 . GM (Cadillac) 273 (4.5L) V8 . GM (Oldsmobile) 307 (5.0L) V8 . GM (Oldsmobile) 350 (5.7L) V8 w/EFI. Engine firing order: 1-8-4-3-6-5-7-2 . Distributor rotation: counterclockwise



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Fig. Fig. 2: GM (Buick) 252 (4.1L) V6 . Engine firing order: 1-6-5-4-3-2. Distributor rotation: clockwise



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Fig. Fig. 3: GM (Cadillac) 368, 425, 472, 500 V8. Engine firing order: 1-5-6-3-4-2-7-8. Distributor rotation: clockwise



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Fig. Fig. 4: GM (Cadillac) 429 V8. Engine firing order: 1-8-7-2-6-5-4-3. Distributor rotation: clockwise

 
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