TBI ignition control module

[grumbolt]

The attached screen shots show a normal SA and very odd SA. I wonder if over time, your SA starts looking odd?

dave w

would you say my icm is bad Dave? when my engine gets up to operating temp, it acts like the timing is way advanced and is hard to start.

attached is a screenshot of the wbo2 spreadsheet with the log pasted into it...

sa 2021-03-12.JPG

important to note, the battery voltage was around 13.5 most of the log, but at the end it was down to around 12.5v i originally suspected the erratic readings due to the voltage going south... the engine was also around 219 degrees at its peak....