By-pass wire

[R.R]

On a 1989 on the by-pass wire for the timing where does the wire go?
One to the computer the other ??????????????.

[ChevyTech]

The set timing connector is in a wire between the ECM and the distributor.


For 1988-1993 C/K pickup trucks:
To set the ignition timing you must unplug the set timing connector. The set timing wire, which is a single Tan wire with a black stripe/tracer on it, is located, under the hood, on the main harness that goes from the engine to the firewall, on the passenger side, sometimes underneath the black plastic cover (if it’s still there) that covers the junction block, relays & fuses. It’s near the top usually on the back side of the harness. From the factory there is what looks like black tape around the harness holding the set timing wire to the back of the harness. Doing this will set a code 42 in the computer. Clear the code after you are done checking or setting the timing.