FIRING ORDERS
NOTE: To avoid confusion, remove and tag the spark plug wires one at a time, for replacement.
If a distributor is not keyed for installation with only one orientation, it could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes in your book to reflect how your engine is wired.
Fig. 1: GM (Cadillac) 250 (4.1L) V8 GM (Cadillac) 273 (4.5L) V8 Engine firing order: 1-8-4-3-6-5-7-2 Distributor rotation: counterclockwise
Fig. 2: 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
Fig. 3: GM (Buick) 252 (4.1L) V6 Engine firing order: 1-6-5-4-3-2 Distributor rotation: clockwise i need to know where - 85872010.gifuploads/images/85872010.gif" alt="85872010.gif" class="h_mi" />
Fig. 4: GM (Cadillac) 368, 425, 472, 500 V8 Engine firing order: 1-5-6-3-4-2-7-8 Distributoi need to know where - 85872011.gifclockwise
Fig. 5: GM (Cadillac) 429 V8 Engine firing order: 1-8i need to know where - 85872012.gif Distributor rotation: clockwise
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In my online resource, there are diagrams, but for copyright issues, they didn't seem to transfer over.
Maybe try autozone.com for 'firing orders' for the 1986 Cadillac Deville.
See Figures 1, 2, 3, and 4 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 Fig. Fig. 2: GM (Buick) 252 (4.1L) V6 . Engine firing order: 1-6-5-4-3-2. Distributor rotation: clockwise Fig. Fig. 3: GM (Cadillac) 368, 425, 472, 500 V8. Engine firing order: 1-5-6-3-4-2-7-8. Distributor rotation: clockwise Fig. Fig. 4: GM (Cadillac) 429 V8. Engine firing order: 1-8-7-2-6-5-4-3. Distributor rotation: clockwise
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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