I am trying to work on VVE table and get it dialed in, but having some trouble after loading tune with revised VVE table. Car will crank perfectly, idle perfectly for just a moment and then die. Looking at the log, the IPW drops to 0.70, so I thought it was me being too aggressive pulling back on the VVE. However, it tried 3 or 4 tunes where I made slight adjustments and the results were the same...car will crank and run, then dies because the IPW drops so low.
I am following Goat Rope Garage's method from youtube on failing the MAF, disabling the LT and ST trims, and logging EQ error %. The AFR readout on the WB matches what I am seeing in the EQ error histogram, so I feel good about the changes I am trying to make to the VVE. I copy the EQ error % and paste to the VVE table (using %, 1/2%, whole table or just portions) in the tune setup for failed MAF. I can keep using the failed MAF tune and alter the VVE table there, correct?
So here is the tune setup to fail the MAF and log EQ error - 5.3.24 - RBs Nova Tune_Fail MAF, Log EQ Error.hpt
Here is the log after loading tune and cruising to dinner - 5.3.24 - RB Nova, MAF Fail, cruise to dinner.hpl
Here is the tune with VVE adjusted using log - 5.3.24 - RBs Nova Tune_Fail MAF, Log EQ Error, Pass 1.hpt
Here is a quick log of the car starting, but not idling - 5.3.24 - RB Nova, Load VVE, won't idle.hpl
I reloaded the first tune, cranked the car and drove home and logged - 5.3.24 - RB Nova, MAF Fail, Cruise Home.hpl
I am also curious why there's a cliff at 60 kPa. Makes no sense, but the car runs just fine (when MAF not failed).
Engine is swapped into a 1963 Chevy II wagon, was built with a mix of everything...so there's not a good base tune I can compare too and try to figure this out. Below is the setup with part numbers.
5.3 Gen IV with truck accessories
E38 ECM (VIN 1GC2GTDG1A1175124) from Chevy Express Van
T42 TCM / 4L65 with VSS and slightly higher stall torque converter
Custom built complete wiring harness
RME87 Throttle Body (gold blade) (Delco / bought new)
15865791 MAF (LS7 card style) mounted 15" from TB in 4" aluminum intake tube, cone filter (Delco / bought new)
12594942 MAP (1.3 bar) (Delco / bought new)
12613411 Injectors in TBSS Intake and fuel rail (bought slightly used)
PCV fresh air connected to port on intake tube between MAF and TB
PCV crankcase air connected to top of intake (full vacuum), 1/16" restriction inline on PCV hose
In tank fuel pump / external Vette filter+regulator (returnless), confirmed ~58 PSI with manual gauge on fuel rail
TSP Stage 2 Low Lift Truck Camshaft, 212/218, .550/.550 112 LSA, LS6 valve springs (no DOD/AFM or VVT)
Mid-length headers 1 7/8" primaries into 3" collector
2 1/2" dual exhaust with X pipe, no cats
Innovative LC-2 wideband