Re 1986 HEI no spark

FWB in SK · Aug 24, 2019

Connected C to A wires and now have spark.Thanks for help Where do these wires go inside the cab is there something to repair there. These are the 4 wires coming out back of distributor.

Bob · Aug 24, 2019

Wires would go to the "ESC" (electronic control spark module).

When you connect those wires, the 'puter is out of the circuit and it fires at "base timing".

Otherwise, trigger signal is modified by ESC to vary timing to control spark knock.

Steve@Advance · Aug 24, 2019

There should be a matching plug on the wiring harness for that to plug into. It may have fallen down between the transmission housing and the firewall.

You need that connection. Without it you will have no spark advance. It will run but be powerless, get bad mileage, and should set the check engine light.

Re 1986 HEI no spark

FWB in SK

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Bob

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Steve@Advance

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