| Weird timing issue |
Subject: Weird timing issue by bam on 2013/5/26 22:35:51 93 LT1, 6 spd (just to remind everyone) I am doing my own tuning now and have adjusted the "main spark advance vs. RPM vs. Load" tables, I have the timing set at 14 degrees at 800rpm all the way across thru all the KPa from 25 to 100. The weird problem is that when I data log the car at idle I am showing 28 degrees of advance and it is very erratic moving from 25 - 30 while neither the rpm or KPa fluctuates that much. I know from reading the FSM that the opti has nothing to with setting degrees of advance, that is all done by the ECM. So something is going on in the computer right, it can't be anything else? I tried a brand new chip thinking the one I have been using might be corrupted but no difference. I also know that the computer adds timing advance when the engine is cold so I checked the temp showing in data master and it reads 195 so that can't be it either. Any thoughts? I see nothing in the FSM that tells how to diagnose a problem like this. No codes either. Any comments, suggestions? |
