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Ss lq9 with 4l80e swap runs great but stalls at stop light or light th


Daver983

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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

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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.

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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.

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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 by Thickcajun (see edit history)
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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.

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