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Tuning Team,
I could use some help on startup parameters on a tune following new cam installation.
vehicle details:
2011 Cadillac Escalade - L94 6.2L gen IV
full DOD and VVT delete.
new cam is GM Performance LS9.
cam specs: LS9 Camshaft Specifications
Camshaft Part Number 126384277
Duration @ .050 in. (int./exh.) 211°/230°
Valve Lift (int./exh.) 0.562 in./0.558 in.
Lobe Separation 122.5°
My nominal elevation is 5,000' (85 KPA)
I updated the startup parameters per HP Academy (excellent) directions here:
Idle Tuning HP Tuners - GM/HP Tuners | Practical Demonstration [GOLD LESSON]
I've scaled the MAF per directions here:
MAF Rescaling with HP Tuners - YouTube
I have a wideband O2 sensor.
The car runs well after warm up.
My problem is cold start (8C and below). I typically have to flood clear (pedal = 100%) and then it starts and runs fine.
In looking at the data, it seems like the ECU is running to much injector pulse width on cold starts.
log and tune attached.
Any hints on what parameter to update next so it starts better in the cold would be greatly appreciated.
Thanks,
Ron Lang
Pueblo, Colorado USA
Attached Files
2011-escalade-LS9-cam-tuned-MAF-idle-startup-air-2025.02.16.hpt
- cold-start-8C-2025.02.16.hpl
Sorry folks. double tap on the post. I only wanted 1 post
Any pointers on how to get more air in at initial startup without the ECM spraying more fuel?
I've already updated the throttle open to 5%. Should I go to 7% or 10%?
