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17 Sierra, 5.3, some idiotically giant cam somebody else installed. The TSP "BD" cam or something...Trims are dialed in +/- 2%, dropped VT down to meet my commanded idle, etc. and with throttle help it'll start and settle in to idle just fine. Truck purrs great. But this thing *WILL NOT* start without help from the throttle pedal. What am I missing? Note, I am only having an issue with start ups. The rest of the trucks performance seems ok.
Thanks
You'll have to go to the Airflow tab, then click General, then find the Cranking Base Airflow table. Increase it by 30% in the 133-up temp area to start with. That'll get you in the ballpark. You may have to go even higher.
What he said, but to add to it, if that's honestly the torque model you're running, then it needs to be fixed in the idle areas too. It looks like torque isn't changing at all from one end to the other - torque in idle area will greatly effect how it starts and keeps running.
Attachment 123617
give this a shot
You guys are great, thank you!