Hey I have a Boosted 6.0 with an IAC and Idle Timing issue. This has had me stumped for a few weeks and im still trying to figure it out. IAC maxs out at zero after startup, and Idle timing is being pulled down to 5* which is my setting of lowest advance. Seems like a vaccum leak problem but I have changed intakes, tb, sensors, plugged vacuum lines etc. NO LUCK!
I wanna say it just started out the blue one day. I just finished installing this new setup so I still have a lot of tuning etc. to do on it. I originally had a TBSS intake on it with the same issue, I swapped it out for a holley high ram with no remedy. I even upgraded to a newer 02 411ecu and 3 bar OS with the same issue. I cant seem to narrow it down.
I have gone as far as changing all kinds of idle tables, opened up the throttle blade, changed to a new TPS sensor, new eBay 92mm tb.
I even had 2 diff throttle bodies and 2 diff IAC sensor without any luck. I've tuned a lot of vehicles over the years, but my own personal one has stumped me!
Imma post up my current tune and a quick idle log file. Any help is greatly appreciated! Ill even buy ya a case of beer! thanks.