Question about 1993 GMC Sierra
It's easiest to think of the engine's firing order when you look at the engine from the underside, with the oil pan removed. The connecting rods are bolted on to the crankshaft in sequence, from the front of the engine to the back. This places the odd numbered pistons on the left or driver's (USA) side, and the even numbers on the right or passenger side of the engine. When we say the firing order is 1-8-4-3-6-5-7-2, we are talking about the front-most piston attached to the crankshaft, then the rear-most piston, then the fourth, the third, and so on. This applies to all Chevrolet V8 engines, and some other brands of V8 engines, but is not universal to all V8 engines. Any repair manual would have an overhead view of the engine showing firing order.
Posted on Mar 20, 2011
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Posted on Jan 02, 2017
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GM Cavalier/Sunfire 1995-2000 Repair Guide
See Figures 1 and 2
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 to reflect how your engine is wired.
Fig. Fig. 1: 2.2L (VIN 4) Engine Firing Order: 1-3-4-2 Distributorless Ignition System
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