1994 Chevrolet Caprice • 6 cylinder 2WD Automatic • 152,000 miles

How to change the optispark module on a 94 caprice 4.3l
Ron hicks
November 22, 2010.

Remove water pump then unbolt Opti/ Dist park location of plug wires

Nov 22, 2010.
Removal & Installation
Disconnect negative battery cable. Drain cooling system. Disconnect Intake Air Temperature (IAT) sensor harness connector. Remove knock sensor. Remove air intake duct. Remove serpentine belt. Remove coolant hoses to water pump assembly.
Disconnect coolant temperature sensor harness connector. Remove water pump-to-engine block mounting bolts. Remove water pump assembly. Remove crankshaft harmonic balancer. Remove belt tensioner. Remove spark plug wires from distributor. See Fig. 2
Disconnect 4-terminal ECM/PCM connector to distributor. Remove 3 distributor mounting bolts. Pull distributor forward until distributor shaft disengages from engine. See Fig. 3Mark top surface of distributor shaft for reassembly purposes.
To install, ensure mark made on distributor shaft during removal is on top or facing up. To complete installation, reverse removal procedure. Refill coolant and check for leaks. Tighten distributor hold-down bolts to 106 INCH lbs. (12 N.M).

Nov 22, 2010.