Re: ECM programer.
You may get some knocking, but the PCM should compensate and retard timing enough to where it'll run without issues. You will lose performance but likely not get a check engine light.
I recently swapped to my stock PCM and 87 octane to diagnose some intake issues. And I couldn't go back to my WAMS fast enough. I swapped in the PCM before filling up with 93. On the way to the station it ran fine, but seemed a little slower than usual when I would accelerate into traffic.
Last edited by CruisinG6; 02-11-2013 at 01:57 PM.