Hi all,
Trying to help a buddy remotely diagnose an idle issue with a recent build on a 2011 CTS-V.
Specs:
Stock LSA bottom
Injector Dynamics 850 injectors
Texas Speed ported heads
Stage 3 Texas Speed Blower Cam
10% over drive crank pulley
2.55 blower pulley
I referenced the injector data from this post https://forum.hptuners.com/showthrea...l=1#post330042 and from the Injector Dynamic website.
Issue:
Issues with startup and idle. LTFT trims quickly go to -17% on both banks once it goes into closed loop fueling. The MAP is reading 70KPA when it starts up and is idling (reads 99KPA key on not running). As a test we put it into MAF only to bypass the Virtual VE table and took 15% of fuel out of the MAF table and it still idles reading at -17% rich.
Questions:
Is this a potential vacuum leak?
I feel the 70KPA at idle is high, even with a 231/239, .640"/.629? cam
I plan on visiting soon and getting wide band readings for him to try and isolate further
Appreciate any insight on where to point him next, etc. I?ve attached the tune file and log to show the issue.