Get a Good Timing Reading

Q: Why can’t I seem to get a proper timing reading?

A: The computer is programmed to automatically advance the timing. You need to disconnect the brown/black striped wire next to the heater box/fan housing and then you can get a real reading. This wire is up along the firewall on the passenger side and usually is right over top of the blower motor. There will be a plug sticking out of the wiring harness loom to allow you to easily disconnect/reconnect it. Otherwise it will seem like it’s advanced a great deal. Always remember to reconnect the wire when you have set the static timing!

Q: I have a carburated engine and don’t have a wire to disconnect..how do I adjust the timing?

A: You must disconnect the vacuum advance line on the distributor (and plug the hose) to adjust the timing. With this hose disconnected, set the base timing to the factory spec (usually 6 degrees advanced). Remember to reconnect the vaccum hose when you are finished!