That year did not have one because the timing is computer controlled and can be only adjusted with a Engine SCANNER.
your truck does not have a bypass connector
When it is disconnected it puts the electronic timing control module in limp mode,and then you can set the timing with a timing light.
That year does not have 1. The timing is computer controlled and you MUST have an engine scanner to set the timing on that engine. A timing light will not work.
the bypass connector is located on the engine wire harness, next to the left valve cover (watching engine front) next to the air injection control valve.
look under carpet on pass side under dash single wire horizontally
electronic spark timing connector
It is a brown wire under the glove box area
disconnect the tan wire connector on the passenger side wiring harness , that puts it in bypass mode, unlock dist. bolt and adjust timing. when set reconnect wiring connector.
Greetings, A code 42 indicates that the electronic spark timing bypass circuit or the electronic spark timing circuit is either open or shorted. A malfunctioning HEI module can cause this.
you're looking for a tan wire with a black stripe. first look under the dash behind the fuse panel, in the far top corner. then check under the relay cover and near the distributor.
On GM trucks, you need to look under the glove compartment for the wiring harness. look for a single wire with a brown tracer that has a black connector. This is the electronic timing connector. Start the truck, unplug connector, set the distributor timing at zero, tighten distributor, reconnect wire.
That year did not have a EST/ electronic spark timing connector. The timing is controlled by the PCM / Powertrain Controll Module. It requires a engine scanner to ajust the timing. You can not use a timing light.