Surging idle
06-22-2007, 08:32 PM
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Surging idle got a HC ta im learing how to tune on its a 231/236 590 lift cam trying ot get it to idle i got it to idle at 750rpms but i got some surge when i hit the gas it goes up down up down then leves back out..... what do i need to change....im using ls1 edit....also when im in drive and coem to a stop its idles at 2k then comes down take a lit but tho....
Last edited by SSPerformance; 06-23-2007 at 01:07 PM.
06-22-2007, 11:40 PM
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not sure about ls1edit but if you have a base running airflow table, i would increase those numbers alittle at a time, as i use hptuners, i log my desired running airflow vrs ect. and then plug those numbers into my base running airflow, to start off, then play with the best timing to get it to idle right without surging.
06-23-2007, 03:39 PM
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Well, there's a post on efilive.com by SSpdDmon that adresses modifications to tables to help correct surge. There's also a post recently where someone bumped timing in the lowest three rpm cells to 35*, 30*, and 25* respectively.
I'm new to all of this but I had a serious surging problem and stalling and flashing these table modifications all but eliminated my problems.
I'm new to all of this but I had a serious surging problem and stalling and flashing these table modifications all but eliminated my problems.
06-23-2007, 04:14 PM
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Part of the problem is that cam will probably like to idle around 850rpm. 750 might just be too low. Check my thread out in the tutorial section of the EFILive forums and also the sticky at the top to see if you have the tables I manipulated - mainly the IAC adjuster tables.
