Question about 1986 GMC C1500
What is the firing order for a 1986 gmc S15?
To avoid confusion, ALWAYS replace spark plug wires one at a time.
The most important thing to remember about the removal and installation of a distributor, cap or spark plug cable is that all wires MUST be labelled before they are disconnected. Keep in mind that these figures depict a firing order where the distributor cap terminals are relative to EACH OTHER only and they do not necessarily depict the tower positions in relation to the rest of the engine. This is true because any distributor which has been removed and reinstalled may have been installed with the No. 1 spark plug tower at any position (360 degrees) in relation to the rest of the motor, as long as the rotor aligned to the No. 1 tower when the No. 1 cylinder was at TDC of the compression stroke (valves closed, ready for the plug to fire). As long as the remaining wires were connected in the correct firing order sequence (depending on direction of distributor rotation) the engine will run. DO NOT EVER remove more than one wire from the distributor cap at a time unless you tag ALL wires and towers to assure proper installation.
Fig. 1: 1.9L engine . Firing order: 1-3-4-2 . Distributor rotation: counterclockwise
Fig. 2: 2.0L engine . Firing order: 1-3-4-2 . Distributor rotation: clockwise
firing order for a 1986 gmc s15 - 5c33822.jpgsrc="http://i.fixya.net/uploads/images/5c33822.jpg" alt="5c33822.jpg" class="h_mi" />
Fig. 3: 2.5L engine . Firing order: 1-3-4-2 . Disfiring order for a 1986 gmc s15 - cae855e.jpgtation: clockwise
Fig. 4: 2.8L enginefiring order for a 1986 gmc s15 - 9674e44.jpgrder: 1-2-3-4-5-6 . Distributor rotation: clockwise
Fig. 5: 4.3L engine. Firing order: 1-6-5-4-3-2 . Distributor rotation: clockwise
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Posted on Oct 05, 2009
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Posted on Jan 02, 2017
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