Quote:
Originally Posted by eazye1973
Hello All,
Does this procedure work on 1991 4.3l S10 Pickup?
Thanks!
Ed
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No. This procedure is for the 4.3L 1996 and newer engines only.
1991 only has one timing mark on the damper. No need to remove the #1 plug on either engine, (The piston will push air out of the spark plug hole on both strokes when approaching TDC). When the TDC timing mark on the damper lines up with the index on the timing cover, #1 piston is at TDC. There are two ways to determine if you are at TDC of the
compression stroke, (not exhaust stroke) on the 4.3L engine: One is to remove the driver side rocker arm cover and check that both valves for #1 cylinder are closed. The second is much easier and done by using a timing light after the distributor is installed. The rotor and distributor are different on the 1991, (no "6" or "8" on distributor housing). On your 1991, when the distributor is fully seated, the rotor must point to the #1 plug wire in the cap. Connect a timing light, disconnect the EST wire, and crank the engine. If the timing mark is visible while cranking, adjust the timing to spec and tighten the distributor hold down bolt. If the mark is not visible, the distributor was installed on the exhaust stroke and must be removed, the shaft rotated 180 degrees, and reinstalled, then check and adjust timing.