low speed cruise problem (throttle hang up on decel)
04-17-2005, 12:59 PM
#1
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low speed cruise problem (throttle hang up on decel) Alright I know this problem is addressed using the throttle cracker/ throttle follower tables, but what exactly needs to be done in the tables? I've done tons of seaches and noone's ever said what to do with the values in the tables...
So help me out here..do you zero it out? increase the values? decrease the values?...
So help me out here..do you zero it out? increase the values? decrease the values?...
04-18-2005, 01:11 AM
#3
TECH Veteran
Here's some explanation of throttle cracker/follower:
https://ls1tech.com/forums/pcm-diagnostics-tuning/146625-throttle-follower-airflow-decay-throttle-cracker-airflow.html
https://ls1tech.com/forums/showthread.php?t=202333
So it sounds like setting them higher is what you would want, to allow the throttle blade to close faster.
https://ls1tech.com/forums/pcm-diagnostics-tuning/146625-throttle-follower-airflow-decay-throttle-cracker-airflow.html
Originally Posted by deezel
Throttle follower decay is how much air flow (grams/sec? grams/cyl?) is allowed to decrease per each 12.5 milliseconds. This comes into play when you let off the throttle - the PCM gradually closes the blade (for electronic throttles anyway) instead of slamming it shut. Throttle cracker is something like a minimum commanded airflow (grams/cyl) to keep the engine idling...
Originally Posted by Racehead
It's called "throttle follower decay" in HPT. It has parameters for in park/neutral, and separate ones for "while in gear". There are other parameters that also effect this like the "TPS tracker step size" and something called " throttle cracker" , which I believe governs idle characteristics while the car is still moving versus when it's completely stopped. It's all in there.
Last edited by ACW; 04-25-2005 at 11:02 PM.
