Daver983 Posted July 21, 2016 Report Share Posted July 21, 2016 Did lq9 swap out of my ss silverado now with 4l80 with btr 3 cam long tube headers 3400 stall car runs Excellent except for when I come up to stop sign it will run shortly and will try or does die most time it dies unless 2 foot. Has lowered thermostat and friend with hp tuners has helped me tune it so far but can't get this problem figured out. Changed throttle body,tac module and fuel pressure stays at 58. Any info will be great Quote Link to comment Share on other sites More sharing options...
Downeast Johnny Posted July 22, 2016 Report Share Posted July 22, 2016 Zippy tune. Quote Link to comment Share on other sites More sharing options...
Thickcajun Posted July 22, 2016 Report Share Posted July 22, 2016 Bump up your Idle Airflow Quote Link to comment Share on other sites More sharing options...
Daver983 Posted July 23, 2016 Author Report Share Posted July 23, 2016 We've done that seems no effect Yes I tuned ve table and maf separately with a wideband. Stft's are within +/- 4%. LTFT are disabled and I have it running in OL. Fueling is spot on. It's the BTR stage 3 cam 231/242 .617"/.592" 112+2. Quote Link to comment Share on other sites More sharing options...
Daver983 Posted July 23, 2016 Author Report Share Posted July 23, 2016 I just don't know if it's in tune or something minor I'm missing. Pulled covers off checked for anything cracked or broke but looks good. I checked ignition system this looks fine as well. Thanks for your help. Quote Link to comment Share on other sites More sharing options...
Thickcajun Posted July 23, 2016 Report Share Posted July 23, 2016 (edited) http://www.masterenginetuner.com/idle-tuning---gm-gen-iii-lsx-p1.html http://www.masterenginetuner.com/idle-tuning---gm-gen-iii-lsx-p1.html There's a section in one of these videos were he talks about rpm hanging and stalling due to the timing. good luck man Edited July 23, 2016 by Thickcajun (see edit history) Quote Link to comment Share on other sites More sharing options...
Daver983 Posted July 24, 2016 Author Report Share Posted July 24, 2016 Ok thank you. Quote Link to comment Share on other sites More sharing options...
chpspecial Posted July 24, 2016 Report Share Posted July 24, 2016 Idle airflow. That's a big cam, you need big changes Sent from my HTC6545LVW using Tapatalk Quote Link to comment Share on other sites More sharing options...
Downeast Johnny Posted July 25, 2016 Report Share Posted July 25, 2016 Idle airflow. That's a big cam, you need big changes Sent from my HTC6545LVW using Tapatalk Pay attention to this man. He knows what he's talking about. I was too short in my first response. "A friend with HP tuners" may or may not be equal to a tuner who really knows these trucks. Professional tuners are worth the money they ask for a proper tune. Quote Link to comment Share on other sites More sharing options...
Daver983 Posted July 27, 2016 Author Report Share Posted July 27, 2016 Thank I'm going over tonight hopefully we can get it figured out. Quote Link to comment Share on other sites More sharing options...
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