I used to think the old school timing light was the only way to set ignition timing

For years, I insisted on using my vintage Sunpro light on every engine, thinking digital tools were just a gimmick. Then I worked on a 2018 Ford F-150 with variable cam timing in a shop in Phoenix, and the old method just couldn't give me the full picture. I finally bought a good scan tool that shows live data, and now I see the exact advance the computer is commanding. Has anyone else made the switch from purely mechanical checks to trusting the computer's data more?

4 comments

4 Comments

john_lopez1mo ago

Right? @johnson.betty's buddy gets it.

johnson.betty1mo ago

My buddy's shop had the same wake-up call with a newer Toyota last month.

sean4817d ago

Hate to nitpick but @derek_ross newer Toyotas actually lock timing through the ECU.

derek_ross1mo ago

Man, tell me about it. I fought it too until a modern Dodge had me chasing my tail. The computer is adjusting timing faster than any light can show. My advice? Use the scan tool to watch the actual advance numbers, then check with the light just to verify the base mark hasn't moved. It saves so much time.