Hanging High Idle and Low timing

[brandon6.0]

I have a hanging idle around 1000rpm and my timing hangs around 8*. Ive looked all over the tune and I cant come up with anything. Im leaning toward to much airflow or something. I also, can not go in the scanner and command idle to what I want. It just hangs at 1k rpm no matter what. I just got this thing up and running, and started tuning it.

I also am limited to 2 bar OS with this 411 ecu. I looked for another matching OS to convert to a 3 Bar OS. I couldn't find any. Does anyone have one I can use?

motor setup:

Built short block 6.0, stock 317s, 80mm tubo, truck intake and 90mm tb. Fuel setup is twin intank 255s and deka 80s.

Any help is appreciated! thanks.

[brandon6.0]

another thing I just thought about, is would a possible vaccum leak cause an issue like this? it just seems weird tht the scanner want let me control the idle rpm at all.

[cobaltssoverbooster]

intake leaks can cause high idle issues.
that log was really short but i notice the b1o2 shows voltage change and the b2o2 does not. might not have been running long enough to get a b2 read but there is a possibility you have an air leak on the b2 side.
typically intake leaks are lean on both sides and trims favor positive to whichever side sees the most fresh air.

what does your map read key on engine off?
what cam do you have?


dont populate the pe table with be afr values. only populate that table with n/a afr values. if for whatever reason you blow a hose and make no boost then your going to run stupidly rich. best to dial those back to 12.3-12.7 targets.

[brandon6.0]

im almost certain map reads 100kpa KOEO. Cam is a lil john stg2 turbo cam specs are 226/231 .605"/.598" 113+4.

Ill change up the PE table. I can see were an intake leak would raise idle, and im guessing timing is being pulled down to try and bring it back in line. Ill check for a leak tomorrow. Very possible with all the vaccum lines on this turbo app.

[brandon6.0]

ok now here is something weird. I just got a customers truck in today to tune. Built 6.0 with all the bells and whistles. Flashed a base tune to get it up and running to look over things, thin noticed it doing the same thing as my truck. Idle rpm stuck around 1000rpm and timing stuck at 22*. Tried scanner with no luck on moving idle around. Basicly the exact same thing as my truck.


I recently downloaded version 4.0, but I have an older interface. Im thinking this could be the issue and imma swap back to the 3.0 version. Hope this works!

[brandon6.0]

no luck same thing

[brandon6.0]

ok figured it out. Customer had wired the front speed sensor into the rear on the 80e. Scanner showed at idle 20ish mph to it was commanding a high octane table timing. Fixed that and all is good to go now.

I am trying to command openloop idle like the older platforms but it doesn't work. THis is a 2006 Silverado. Can u guys look over the tune and see if im missing something thanks.

2006 Silverado 6.0-80e Modified tune (Dawson).hpt